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Commitment and Contingencies - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Nov. 30, 2020
Oct. 31, 2019
Jun. 30, 2021
Jun. 30, 2021
Jan. 01, 2021
Mar. 31, 2019
Lessor, Lease, Description [Line Items]            
Accrued Liabilities         $ 1,900  
Lease liabilities     $ 1,614 $ 1,614    
Long-term Debt         600  
Operating lease costs     $ 300 700    
Cash paid for operating lease       $ 1,000    
Weighted average discount rate     8.20% 8.20%    
Weighted-average remaining lease term     10 months 9 days 10 months 9 days    
ASU No. 2016-02            
Lessor, Lease, Description [Line Items]            
Lease liabilities         2,500  
Right-of-use assets         $ 1,700  
South San Francisco, California            
Lessor, Lease, Description [Line Items]            
Operating lease, renewal term     5 years 5 years    
Operating lease expiration date       May 31, 2022    
San Diego, California            
Lessor, Lease, Description [Line Items]            
Operating lease, term of contract           13 months
Extend the lease term December 2021 May 2021