Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Schedule of Debt Securities Classified as Available-for-Sale Investments (Details)

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Fair Value Measurements - Schedule of Debt Securities Classified as Available-for-Sale Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost $ 119,260 $ 108,656
Gross Unrealized Gains   6
Fair value 119,260 108,662
Money Market Funds Included in Cash and Cash Equivalents    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 118,260 101,429
Fair value 118,260 101,429
Corporate Bonds - due in One Year or Less    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost 1,000 7,227
Gross Unrealized Gains   6
Fair value $ 1,000 $ 7,233