Quarterly report pursuant to Section 13 or 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
Mar. 31, 2021
Dec. 31, 2020
Short-term investments:    
Short-term investments $ 4,751 $ 7,233
Fair Value, Measurements, Recurring    
Financial assets    
Total 102,028 108,662
Fair Value, Measurements, Recurring | Money Market Funds    
Cash and Cash equivalents:    
Money market funds 97,277 101,429
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Financial assets    
Total 97,277 101,429
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds    
Cash and Cash equivalents:    
Money market funds 97,277 101,429
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Financial assets    
Total 4,751 7,233
Fair Value, Measurements, Recurring | Short-term Investments - Corporate Bonds    
Short-term investments:    
Short-term investments 4,751 7,233
Fair Value, Measurements, Recurring | Short-term Investments - Corporate Bonds | Significant Other Observable Inputs (Level 2)    
Short-term investments:    
Short-term investments $ 4,751 $ 7,233