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Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lessee, Operating Lease, Description [Abstract]        
Amortization of right-of-use assets     $ 174 $ 159
Operating lease costs $ 107 $ 112 223 224
Cash paid for amounts included in measurement of operating lease liabilities $ 115 $ 115 $ 231 $ 231
Incremental borrowing rate     9.76%  
Weighted average remaining lease term 2 years 7 months 6 days   2 years 7 months 6 days  
Operating Lease Maturities [Abstract]        
Remaining 2021 $ 239   $ 239  
2022 371   371  
2023 242   242  
2024 186   186  
Total remaining lease payments 1,038   1,038  
Less: imputed interest (142)   (142)  
Total lease liabilities $ 896   $ 896  
Minimum [Member]        
Lessee, Operating Lease, Description [Abstract]        
Remaining lease term     1 year  
Maximum [Member]        
Lessee, Operating Lease, Description [Abstract]        
Remaining lease term     4 years  
Facility One [Member]        
Lessee, Operating Lease, Description [Abstract]        
Renewal option term 2 years   2 years  
Carlsbad Facility [Member]        
Lessee, Operating Lease, Description [Abstract]        
Renewal option term 5 years   5 years