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Commitments and Contingencies - Narrative (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
building
renewalOption
ft²
Dec. 31, 2021
USD ($)
building
ft²
Dec. 31, 2020
USD ($)
Jan. 31, 2022
USD ($)
Jan. 01, 2020
USD ($)
Jul. 31, 2013
Guarantor Obligations            
Total minimum payments $ 4,537 $ 4,537        
Operating lease right-of-use assets, net 3,279 3,279 $ 4,641      
Operating lease liability $ 4,096 $ 4,096        
Weighted average discount rate 10.00% 10.00%        
Weighted average remaining operating lease term (in years)     3 years 9 months 18 days      
Rent expense   $ 2,700 $ 2,900      
Total minimum payments $ 54,537 54,537        
Subsequent Event | Standby Letters of Credit            
Guarantor Obligations            
Standby letter of credit amount       $ 3,000    
Restricted Cash Noncurrent | Subsequent Event            
Guarantor Obligations            
Deposit with bank related to standby letter of credit, recorded as restricted cash       $ 3,000    
Building            
Guarantor Obligations            
Operating lease liability $ 49,200 $ 49,200        
Number of buildings | building 2 2        
Number of square feet of space | ft² 158,221 158,221        
Operating lease term (in months) 122 months 122 months        
Number of renewal options | renewalOption 2          
Operating lease renewal term (in years) 5 years 5 years        
Annual base rent year one $ 4,300 $ 4,300        
Annual base rent year ten 5,500 5,500        
Receivable allowance for tenant improvements 7,900 7,900        
Cumulative Effect, Period of Adoption, Adjusted Balance | Accounting Standards Update 2016-02            
Guarantor Obligations            
Operating lease right-of-use assets, net         $ 6,000  
Operating lease liability         7,400  
Deferred rent obligation         $ 1,400  
Redwood City, CA            
Guarantor Obligations            
Total minimum payments $ 4,500 $ 4,500        
Operating lease term (in months)           3 years