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Fair Value Measurements - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets:    
Total fair value of assets $ 450,383 $ 111,463
Liabilities:    
Total fair value of liabilities   1,615
Preferred Stock Purchase Right Liability    
Liabilities:    
Total fair value of liabilities   1,615
Money Market Funds | Cash and Cash Equivalents    
Assets:    
Total fair value of assets 351,625 [1] 57,238 [2]
US Treasury Securities | Short-Term Investments    
Assets:    
Total fair value of assets 18,097 [3] 38,492 [4]
US Treasury Securities | Long-Term Investments    
Assets:    
Total fair value of assets [5] 44,770  
Corporate Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets 2,822 [3] 3,793 [4]
Commercial Paper | Cash and Cash Equivalents    
Assets:    
Total fair value of assets [2]   900
Commercial Paper | Short-Term Investments    
Assets:    
Total fair value of assets 31,566 [3] 11,040 [4]
Supranational Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets [3] 1,503  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total fair value of assets 414,492 95,730
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money Market Funds | Cash and Cash Equivalents    
Assets:    
Total fair value of assets 351,625 [1] 57,238 [2]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Short-Term Investments    
Assets:    
Total fair value of assets 18,097 [3] 38,492 [4]
Quoted Prices in Active Markets for Identical Assets (Level 1) | US Treasury Securities | Long-Term Investments    
Assets:    
Total fair value of assets [5] 44,770  
Significant Other Observable Inputs (Level 2)    
Assets:    
Total fair value of assets 35,891 15,733
Significant Other Observable Inputs (Level 2) | Corporate Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets 2,822 [3] 3,793 [4]
Significant Other Observable Inputs (Level 2) | Commercial Paper | Cash and Cash Equivalents    
Assets:    
Total fair value of assets [2]   900
Significant Other Observable Inputs (Level 2) | Commercial Paper | Short-Term Investments    
Assets:    
Total fair value of assets 31,566 [3] 11,040 [4]
Significant Other Observable Inputs (Level 2) | Supranational Debt Securities | Short-Term Investments    
Assets:    
Total fair value of assets [3] $ 1,503  
Significant Unobservable Inputs (Level 3)    
Liabilities:    
Total fair value of liabilities   1,615
Significant Unobservable Inputs (Level 3) | Preferred Stock Purchase Right Liability    
Liabilities:    
Total fair value of liabilities   $ 1,615
[1] Included as cash and cash equivalents on the consolidated balance sheets.
[2] Included as cash and cash equivalents on the consolidated balance sheets.
[3] Included as short-term investments on the consolidated balance sheets.
[4] Included as short-term investments on the consolidated balance sheets.
[5] Included as long-term investments on the consolidated balance sheets.