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Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Lessee, Operating Lease, Description [Abstract]        
Amortization of right-of-use assets     $ 159 $ 147
Operating lease costs $ 112 $ 116 224 227
Cash paid for amounts included in measurement of operating lease liabilities $ 114 $ 110 $ 207 $ 204
Incremental borrowing rate     9.76%  
Weighted average remaining lease term 3 years 7 months 6 days   3 years 7 months 6 days  
Operating Lease Maturities [Abstract]        
Remaining 2020 $ 228   $ 228  
2021 456   456  
2022 371   371  
2023 242   242  
2024 186   186  
Total remaining lease payments 1,483   1,483  
Less: imputed interest (234)   (234)  
Total lease liabilities $ 1,249   $ 1,249  
Minimum [Member]        
Lessee, Operating Lease, Description [Abstract]        
Remaining lease term     1 year  
Maximum [Member]        
Lessee, Operating Lease, Description [Abstract]        
Remaining lease term     5 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