Annual report pursuant to Section 13 and 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 ($)
Dec. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost   $ 108,656,000
Gross Unrealized Gains   6,000
Fair value $ 0 108,662,000
Money Market Funds Included in Cash and Cash Equivalents    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost   101,429,000
Fair value   101,429,000
Corporate Bonds - due in One Year or Less    
Schedule Of Available For Sale Securities [Line Items]    
Amortized Cost   7,227,000
Gross Unrealized Gains   6,000
Fair value   $ 7,233,000