Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details)

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Fair Value Measurements - Financial Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Short-term investments:    
Short-term investments   $ 7,233
Fair Value, Measurements, Recurring    
Cash and cash equivalents:    
Total $ 122,222 108,662
Short-term investments:    
Total 122,222 108,662
Fair Value, Measurements, Recurring | Corporate Note Securities    
Short-term investments:    
Short-term investments   7,233
Fair Value, Measurements, Recurring | Money Market Funds    
Cash and cash equivalents:    
Money market funds 122,222 101,429
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Cash and cash equivalents:    
Total 122,222 101,429
Short-term investments:    
Total 122,222 101,429
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds    
Cash and cash equivalents:    
Money market funds $ 122,222 101,429
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Cash and cash equivalents:    
Total   7,233
Short-term investments:    
Total   7,233
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate Note Securities    
Short-term investments:    
Short-term investments   $ 7,233