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Fair Value Measurements - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets:    
Total fair value of assets $ 417,732 $ 450,383
Money Market Funds | Cash and Cash Equivalents    
Assets:    
Total fair value of assets 327,872 [1] 351,625 [2]
US Treasury Securities | Short-Term Investments    
Assets:    
Total fair value of assets 33,822 [3] 18,097 [4]
US Treasury Securities | Long-Term Investments    
Assets:    
Total fair value of assets 29,224 [5] 44,770 [6]
Corporate Debt Securities | Cash and Cash Equivalents    
Assets:    
Total fair value of assets [1] 1,450  
Corporate Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets 1,305 [3] 2,822 [4]
Commercial Paper | Short-Term Investments    
Assets:    
Total fair value of assets 24,059 [3] 31,566 [4]
Supranational Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets [4]   1,503
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total fair value of assets 390,918 414,492
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds | Cash and Cash Equivalents    
Assets:    
Total fair value of assets 327,872 [1] 351,625 [2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Short-Term Investments    
Assets:    
Total fair value of assets 33,822 [3] 18,097 [4]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Long-Term Investments    
Assets:    
Total fair value of assets 29,224 [5] 44,770 [6]
Significant Other Observable Inputs (Level 2)    
Assets:    
Total fair value of assets 26,814 35,891
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities | Cash and Cash Equivalents    
Assets:    
Total fair value of assets [1] 1,450  
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets 1,305 [3] 2,822 [4]
Significant Other Observable Inputs (Level 2) | Commercial Paper | Short-Term Investments    
Assets:    
Total fair value of assets $ 24,059 [3] 31,566 [4]
Significant Other Observable Inputs (Level 2) | Supranational Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets [4]   $ 1,503
[1] Included as cash and cash equivalents on the condensed consolidated balance sheets.
[2] Included as cash and cash equivalents on the condensed consolidated balance sheets.
[3] Included as short-term marketable securities on the condensed consolidated balance sheets.
[4] Included as short-term marketable securities on the condensed consolidated balance sheets.
[5] Included as long-term marketable securities on the condensed consolidated balance sheets.
[6] Included as long-term marketable securities on the condensed consolidated balance sheets.