Entity Address, City or Town Entity Address, City or Town Fair Value Disclosures [Abstract] Net income (loss) per share attributable to common stockholders Earnings Per Share [Abstract] Level 1 Fair Value, Inputs, Level 1 [Member] Schedule of Accrued Expenses and Other Current Liabilities Schedule of Accrued Liabilities [Table Text Block] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Nature of business. Nature Of Business [Line Items] Nature of Business [Line Items] Amendment Flag Amendment Flag Capital Expenditures Incurred but Not yet Paid Property and equipment purchases unpaid at period end Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized Number of shares authorized Right-of-use asset Operating Lease, Right-of-Use Asset Operating lease right-of-use assets, net Document Quarterly Report Document Quarterly Report Less amount representing implied interest Lessee, Operating Lease, Liability, Undiscounted Excess Amount Cash and Cash Equivalents Cash and Cash Equivalents [Domain] Statement [Table] Statement [Table] Operating Lease, Liability, Noncurrent Noncurrent portion of operating lease liabilities Operating lease liabilities Share Based Compensation Arrangement By Share Based Payment Award Vesting Number Of Installments Number of installments The number of annual installments in which a share-based payment award vests. Preferred Stock, Shares Outstanding, Ending Balance Preferred Stock, Shares Outstanding, Beginning Balance Preferred stock, shares outstanding Preferred Stock, Shares Outstanding Common stock, capital shares reserved for future issuance Common Stock, Capital Shares Reserved for Future Issuance Nature of Business Nature of Operations [Text Block] Entity Addresses, Address Type [Axis] Product and Service Product and Service [Axis] Employee-related Liabilities, Current, Total Payroll and payroll related Employee-related Liabilities, Current Lessee, Operating Leases [Text Block] Leases Share-Based Payment Arrangement, Option [Member] Stock Options Total liabilities and stockholders’ equity Liabilities and Equity Plan Name Plan Name [Domain] Reclassification, Comparability Adjustment [Policy Text Block] Reclassification Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income Statement [Abstract] Sale of Stock [Domain] Total current liabilities Net liability related to reimbursable costs Liabilities, Current Cumulative increase in percentage of number of shares of common stock issued and outstanding Cumulative Increase in Percentage of Number of Shares of Common Stock Issued and Outstanding Cumulative increase in percentage of number of shares of common stock issued and outstanding. Lessee, Operating Lease, Liability, to be Paid, Year Three 2025 Deferred revenue Increase (Decrease) in Contract with Customer, Liability Preferred stock, shares authorized Preferred Stock, Shares Authorized Schedule Of Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Table] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table] State and Local Income Tax Expense (Benefit), Continuing Operations, Total State and Local Income Tax Expense (Benefit), Continuing Operations State income taxes Entity Small Business Entity Small Business Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Cash, cash equivalents and restricted cash at the beginning of period Cash, cash equivalents and restricted cash at the end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Total current assets Assets, Current Indefinite-lived Intangible Assets Indefinite-Lived Intangible Assets [Axis] Lessee, Operating Lease, Liability, to be Paid, Remainder of Fiscal Year 2022 Weighted Average Number of Shares Outstanding, Basic, Total Weighted average common shares outstanding, basic Basic Weighted Average Number of Shares Outstanding, Basic Performance based restricted stock units. Performance Based Restricted Stock Units [Member] Performance-based Restricted Stock Units Prior Office Space Prior Office Space [Member] Prior office space. City Area Code City Area Code Additional office space. Additional Office Space [Member] Additional Office Space Fair Value Assets Measured On Recurring Basis [Abstract] Fair value assets measured on recurring basis. Share-Based Payment Arrangement [Abstract] Total liabilities Liabilities Document Period End Date Document Period End Date Restricted Stock Awards Restricted Stock [Member] Office space. Office Space [Member] Office Space Unaudited Interim Financial Information Unaudited Interim Financial Information Policy [Text Block] Disclosure of accounting policy for unaudited interim financial information. Number of company directors in control of related party entity Related Party Transaction Entity Controlled By Director Number The number of Company directors in control of a related party entity. Statistical Measurement Statistical Measurement [Axis] Aggregate offering price Stock Issuance Program Authorized Amount Amount of shares authorized to be issued under a stock issuance program. Total assets Assets Earnings Per Share, Diluted, Total Net income (loss) per share, diluted Diluted Earnings Per Share, Diluted Cash equivalents Cash and Cash Equivalents [Abstract] Share-Based Payment Arrangement, Additional Disclosure [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Document Fiscal Period Focus Document Fiscal Period Focus Non Cash Lease Expense Non-cash lease expense Amount of noncash expense related to leasing arrangements. Restricted Cash, Total Restricted cash Restricted Cash Provision for income taxes Current Income Tax Expense (Benefit) Current Income Tax Expense (Benefit), Total Accounts receivable Increase (Decrease) in Accounts Receivable Preferred stock, $0.001 par value per share; 10,000,000 shares authorized; no shares issued and outstanding as of June 30, 2022, and December 31, 2021 Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Lessor, Operating Lease, Existence of Option to Extend [true false] Counterparty Name Counterparty Name [Domain] Total lease liability Operating Lease, Liability Operating lease liability Total lease liability Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Statement of Financial Position [Abstract] Entity File Number Entity File Number Statement of Cash Flows [Abstract] Statistical Measurement Statistical Measurement [Domain] Statement of Stockholders' Equity [Abstract] Sale of Stock [Axis] Legal Entity [Axis] Fair Value Measurements Fair Value Disclosures [Text Block] Annual retainer Retainage Deposit Proceeds from issuance of common stock for exercise of stock options Proceeds from Stock Options Exercised The maximum increase in the number of shares that may be issued under a share-based payment arrangement on the first day of each fiscal year, as a percentage of shares outstanding. Share Based Compensation Arrangement By Share Based Payment Award Annual Increase Percentage Percentage of shares of common stock Outstanding Percentage of annual increase in shares that may be issued Business Development Consulting Agreements Business Development Consulting Agreements [Member] Business development consulting agreements. Weighted Average Number Diluted Shares Outstanding Adjustment, Total Dilutive effect of outstanding stock options Weighted Average Number of Shares Outstanding, Diluted, Adjustment Collaboration Revenue Revenue from Contract with Customer [Text Block] Antidilutive Securities [Axis] Related party transaction expense Related Party Transaction, Expenses from Transactions with Related Party Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Carrying value as of the balance sheet date of obligations incurred and payable for research and development, including, but not limited to, manufacturing and clinical expenses. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Accrued Research and Development Expense including Manufacturing and Clinical Expenditures Current Research and development, including manufacturing and clinical expenditures Weighted average common shares outstanding, diluted Diluted Weighted Average Number of Shares Outstanding, Diluted 2015 Employee Stock Purchase Plan Two Thousand and Fifteen Employee Stock Purchase Plan [Member] Two thousand and fifteen employee stock purchase plan. General and Administrative General and Administrative Expense [Member] Current Fiscal Year End Date Current Fiscal Year End Date Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Granted In Period Aggregate Grant Date Fair Value Aggregate grant date fair market value of restricted stock units granted The aggregate grant date fair value of equity instruments other than options granted during the period. Nature of business. Nature Of Business [Table] Nature Of Business [Table] Entity Address, Address Line One Entity Address, Address Line One Supplemental disclosure of noncash financing activities Supplemental Cash Flow Information [Abstract] Lease Expiration Date Lease expiration date Restricted Cash, Noncurrent Restricted cash Income Tax Expense (Benefit), Total Income tax expense Income Tax Expense (Benefit) Operating lease liabilities Increase (Decrease) in Operating Lease Liability Income Taxes Income Tax Disclosure [Text Block] Preferred Stock, Shares Issued, Total Preferred stock, shares issued Preferred Stock, Shares Issued Date which lease or group of leases is set to commence, in YYYY-MM-DD format. Lease Commencement Date Lease commencement date Payments to Acquire Property, Plant, and Equipment, Total Additions to property and equipment Payments to Acquire Property, Plant, and Equipment Income Tax Disclosure [Abstract] Address Type [Domain] Level 2 Fair Value Hierarchy and NAV [Axis] Equity [Abstract] Income (loss) from operations Operating Income (Loss) Location of Office Space Location of Office Space Location of office space Share-Based Compensation Arrangement by Share-Based Payment Award, Terms of Award Performance based restricted stock units terms of award Significant Accounting Policies Significant Accounting Policies Policy [Text Block] Disclosure of accounting policy for significant accounting policies. Accrued expenses and other current liabilities Total accrued expenses and other current liabilities Accrued expenses and other current liabilities Accrued Liabilities and Other Liabilities Common stock voting rights per share Common Stock, Voting Rights Entity Filer Category Entity Filer Category Total operating expenses Operating Expenses Entity Current Reporting Status Entity Current Reporting Status Total stockholders’ equity Balance Balance Stockholders' Equity Attributable to Parent Entity Tax Identification Number Entity Tax Identification Number Income Statement Location Income Statement Location [Axis] Number of units cancelled due to terminations Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period Common stock, $0.001 par value; 300,000,000 shares authorized as of June 30, 2022 and December 31, 2021; 83,257,591 and 83,102,730 shares issued and outstanding as of June 30, 2022 and December 31, 2021, respectively Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common Stock, Value, Issued Retained earnings (accumulated deficit) Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit) Equity Components Equity Components [Axis] Leases [Abstract] Disaggregation Of Revenue [Table] Disaggregation of Revenue [Table] Entity Emerging Growth Company Entity Emerging Growth Company Fair Value Assets Measured On Recurring Basis [Table] Fair Value Assets Measured On Recurring Basis [Table] Disclosure of information about assets at fair value on recurring basis. Operating expenses Operating Expenses [Abstract] Consulting Agreement Consulting Agreement [Member] Consulting agreement. Amount of deferred tax asset used to offset taxable income during the period. Deferred tax assets to offset taxable income Deferred Tax Assets To Offset Taxable Income Retirement Benefits [Abstract] Depreciation, Depletion and Amortization, Nonproduction, Total Depreciation and amortization expense Depreciation, Depletion and Amortization, Nonproduction Document Transition Report Document Transition Report Employee Stock Purchase Plan Employee Stock Purchase Plan [Member] Employee stock purchase plan. Accrued Expenses and Other Current Liabilities Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Fair Value Assets Measured On Recurring Basis [Line Items] Fair Value Assets Measured On Recurring Basis [Line Items] Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Net income (loss) and comprehensive income (loss) Net income (loss) Net Income (Loss) Attributable to Parent Current lease liability Current portion of operating lease liabilities Operating lease liabilities Roche License Agreement Roche License Agreement [Member] Roche license agreement. Additional Paid-in Capital Additional Paid-in Capital [Member] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Net Income (Loss) Per Share Attributable to Common Stockholders Earnings Per Share [Text Block] Lessee, Lease, Description [Table] Share-based Payment Arrangement, Noncash Expense, Total Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Total Property and equipment, net Property, Plant and Equipment, Net Award Type [Domain] Statement [Line Items] Statement [Line Items] Title of 12(b) Security Title of 12(b) Security Increase (Decrease) in Accounts Payable, Total Accounts payable Increase (Decrease) in Accounts Payable Common Stock Common Stock [Member] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Equity Component Equity Component [Domain] Revenue from Contract with Customer, Excluding Assessed Tax, Total Collaboration revenue Revenue from Contract with Customer, Excluding Assessed Tax Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Leasehold improvement allowance Lease Hold Improvement Allowance The monetary allowance granted by the landlord to a tenant to entice tenant to move into landlords building which will enable the tenant to prepare the leased premises for tenants occupancy. Entity Address, State or Province Entity Address, State or Province Lessee, Operating Lease, Liability, to be Paid, Year Four 2026 Net decrease in cash, cash equivalents and restricted cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Document Type Document Type Jeffries Jefferies LLC [Member] Jefferies LLC. Entity Shell Company Entity Shell Company Total stock-based compensation expense Share-Based Payment Arrangement, Expense Loss Contingencies [Line Items] Loss Contingencies [Line Items] Security Exchange Name Security Exchange Name Revenue from Contract with Customer [Abstract] 2020 Incentive Award Plan Two Thousand Twenty Incentive Award Plan [Member] Two thousand twenty incentive award plan. Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] Amount of lessee's undiscounted obligation for lease payments for operating lease for tenant improvement allowance. Operating Lease Tenant Improvement Allowance Less amount representing tenant improvement allowance Net cash used in operating activities Net Cash Provided by (Used in) Operating Activities Commitments and Contingencies Disclosure [Abstract] Income taxes Accrued Income Taxes, Current Operating Lease, Cost Operating lease costs Restricted Stock Units (RSUs) [Member] Restricted Stock Units Summary of Future Minimum Payments under Operating Leases Lessee, Operating Lease, Liability, Maturity [Table Text Block] Principles of Consolidation Consolidation, Policy [Policy Text Block] Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Principal Office Principal Office Member Principal office. Common Stock, Shares, Outstanding, Ending Balance Common Stock, Shares, Outstanding, Beginning Balance Common stock, shares outstanding Common Stock, Shares, Outstanding Level 2 Fair Value, Inputs, Level 2 [Member] Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Commitments and contingencies (see Note 11) Commitments and Contingencies Number of shares issued Common Stock, Shares, Issued, Total Common stock, shares issued Common Stock, Shares, Issued Nature Of Business [Abstract] Nature of business. Minimum [Member] Minimum Stockholders’ equity: Stockholders' Equity Attributable to Parent [Abstract] Accrued Income Taxes, Noncurrent Income taxes payable Counterparty Name Counterparty Name [Axis] Entity Address, Address Line Two Cash and Cash Equivalents Cash and Cash Equivalents [Axis] Award Type [Axis] Summary of Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Lease Expiration Month And Year Lease Expiration Month And Year Lease expiration month and year Research and Development Expense, Total Research and development Research and Development Expense Total lease payments Lessee, Operating Lease, Liability, to be Paid Entity Central Index Key Entity Central Index Key Success fee Consulting Agreement Success Fee Payout The aggregate amount payable by the Company, as part of a consulting agreement. The payout amount is a success fee calculated as a percentage of certain product sales. Former Address [Member] Former Address Accounting Policies [Abstract] Accrued expenses and other liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Disaggregation Of Revenue [Line Items] Disaggregation of Revenue [Line Items] Common stock, capital shares reserved for future issuance Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant Number of shares available for future issuance Stock-based Compensation Share-Based Payment Arrangement [Text Block] General and Administrative Expense, Total General and administrative General and Administrative Expense Organization, Consolidation and Presentation of Financial Statements [Abstract] Document Information [Table] Research and Development Expense Research and Development Expense [Member] Sales Agreement Open Market Sale Agreement [Member] Open market sale agreement. Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Right of use assets obtained in exchange for operating lease liabilities Adjustments to reconcile net income (loss) to net cash used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Retained Earnings [Member] Retained Earning/ (Accumulated Deficit) Money Market Funds Money Market Funds [Member] From Two Thousand Thirteen Incentive Plan [Member] From Two Thousand Thirteen Incentive Plan [Member] From 2013 Plan Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] 2020 Employee Stock Purchase Plan Two Thousand and Twenty Employee Stock Purchase Plan [Member] Two thousand and twenty employee stock purchase plan. Two thousand thirteen incentive plan. Two Thousand Thirteen Incentive Plan [Member] 2013 Incentive Plan Commission percentage of aggregate gross proceeds from each sale of shares Percentage Of Commission Of Aggregate Gross Proceeds From Each Sale Of Shares Percentage of commission of aggregate gross proceeds from each sale of shares. Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Rights, Percentage Award vesting percentage Additional Paid in Capital, Ending Balance Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Total Additional paid-in capital Additional Paid in Capital Entity Interactive Data Current Entity Interactive Data Current Related Party Transactions Related Party Transactions Disclosure [Text Block] Entity Controlled by Director Entity Controlled by Director [Member] Entity controlled by director. Related Party Transactions [Abstract] Lessee, Operating Lease, Liability, to be Paid, Year One 2023 Local Phone Number Local Phone Number Schedule of Financial Assets Measured at Fair Value on Recurring Basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Summary of Basic and Diluted Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Common Stock Common Stock [Text Block] The entire disclosure for common stock, including, but not limited to, the number of shares issued and outstanding, voting rights, and number of shares reserved for each class of stock. Share Based Compensation Arrangement By Share Based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross Options granted Income Statement Location Income Statement Location [Domain] Balance, shares Balance, shares Shares, Outstanding Increase (Decrease) in Prepaid Expense and Other Assets, Total Prepaid expenses and other current assets Increase (Decrease) in Prepaid Expense and Other Assets Schedule Of Share Based Compensation Arrangements By Share Based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Location of the additional office space Location Of Additional Office Space Location of additional office space. Document Fiscal Year Focus Document Fiscal Year Focus Lessee, Operating Lease, Liability, to be Paid, Year Two 2024 Interest and Other Income, Total Interest income and other, net Interest and Other Income Earnings Per Share, Basic, Total Net income (loss) per share, basic Basic Earnings Per Share, Basic Benefit Plan Compensation and Employee Benefit Plans [Text Block] Commission percentage of aggregate gross proceeds from each sale of shares Commission Rate The commission rate the Company agreed to pay for shares sold under a Sales Agreement, as a percentage of aggregate gross sales proceeds from each sale of shares. Assets Assets [Abstract] Cash, cash equivalents and restricted cash at the end of period: Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract] Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Operating Lease Future Tenant Improvement Allowance Less amount representing future tenant improvement allowance Amount of lessee's undiscounted obligation for lease payments for operating lease for tenant improvement allowance. Share Based Compensation Arrangement By Share Based Payment Award Options Granted In Period Aggregate Grant Date Fair Value The aggregate grant date fair value of options granted during the period. Aggregate grant date fair market value Long-Lived Tangible Asset [Axis] Liabilities and Stockholders’ Equity Liabilities and Equity [Abstract] Accrued License Fees Current License fee Carrying value as of the balance sheet date of obligations incurred and payable for licensing arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Antidilutive Securities, Name [Domain] Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current assets Assets, Current [Abstract] Fair Value Hierarchy and NAV Fair Value Hierarchy and NAV [Domain] Payables and Accruals [Abstract] Costs reimbursed amount Costs Reimbursed Amount The aggregate amount of costs that have been, or will be, reimbursed by the licensee. Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Federal Income Tax Expense (Benefit), Continuing Operations, Total Federal Income Tax Expense (Benefit), Continuing Operations Federal income taxes Related Party Transaction [Line Items] Related Party Transaction [Line Items] Entity [Domain] Cover [Abstract] Product and Service Product and Service [Domain] Professional fees and other Accrued Professional Fees And Other Current Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received, and fees classified as other. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Current liabilities Liabilities, Current [Abstract] Maximum Maximum Maximum [Member] Defined contribution plan, employer matching contribution, percentage Defined Contribution Plan, Employer Matching Contribution, Percent of Match Schedule of Stock-based Compensation Expense Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table] Issuance of common stock upon exercise of stock options, shares Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Level 3 Fair Value, Inputs, Level 3 [Member] Share-Based Payment Arrangement, Cost by Plan [Table Text Block] Summary of Stock-based Compensation Expense by Award Type Use of Estimates Use of Estimates, Policy [Policy Text Block] Issuance of common stock upon exercise of stock options Stock Issued During Period, Value, Stock Options Exercised Defined contribution plan recognized expense related to matching contributions Defined Contribution Plan, Cost Common stock, shares authorized Common Stock, Shares Authorized Trading Symbol Trading Symbol Title of Individual Title of Individual [Domain] Performance-Based Awards Performance Shares [Member] Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Increase (Decrease) in Other Operating Assets, Total Other assets Increase (Decrease) in Other Operating Assets Plan Name Plan Name [Axis] Schedule Of Related Party Transactions By Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Title of Individual Title of Individual [Axis] Director Director [Member] Long-Lived Tangible Asset [Domain] Common stock, par value Common Stock, Par or Stated Value Per Share Lessor, Lease, Description [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period Number of units granted Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Increased number of shares available under incentive plan Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized Number of additional shares authorized Number of shares excluded from computation of diluted net income per share Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Indefinite-lived Intangible Assets, Major Class Name Indefinite-Lived Intangible Assets, Major Class Name [Domain] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure