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Commitment & Contingencies - Facility Leases (Details)
$ in Thousands
1 Months Ended 6 Months Ended
Jun. 01, 2020
USD ($)
Dec. 31, 2020
USD ($)
contract
Jun. 30, 2021
USD ($)
contract
Jun. 30, 2020
USD ($)
Jan. 31, 2021
Lessee, Lease, Description [Line Items]          
Lease term         6 months
Impairment of operating lease right-of-use asset   $ 15      
Operating lease right-of-use asset obtained in exchange for operating lease liability $ 600   $ 0 $ 767  
Weighted average remaining lease term   2 years 10 months 2 years 7 months    
Estimated incremental borrowing rate     10.00%    
Lessee, Operating Lease, Liability, Payment, Due [Abstract]          
2021 (remaining six months)     $ 140    
2022     271    
2023     281    
2024     25    
2025     0    
Total future lease payments, undiscounted     717    
(Less): Imputed interest     (83)    
Present value of operating lease payments     $ 634    
Irvine office and laboratory facility          
Lessee, Lease, Description [Line Items]          
Number of leases | contract   3      
Other facility leases          
Lessee, Lease, Description [Line Items]          
Number of leases not impaired | contract     2