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Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Lessee, Operating Lease, Description [Abstract]    
Amortization of right-of-use assets $ 79 $ 93
Operating lease costs 112 111
Cash paid for amounts included in measurement of operating lease liabilities $ 93 $ 94
Incremental borrowing rate 9.76%  
Weighted average remaining lease term 3 years 10 months 24 days  
Operating Lease Maturities [Abstract]    
Remaining 2020 $ 343  
2021 456  
2022 371  
2023 242  
2024 186  
Total remaining lease payments 1,598  
Less: imputed interest (267)  
Total lease liabilities $ 1,331  
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  
Carlsbad Facility [Member]    
Lessee, Operating Lease, Description [Abstract]    
Renewal option term 5 years