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Commitments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lessee, Operating Lease, Description [Abstract]    
Renewal term 2 years  
Amortization of right-of-use asset $ 93 $ 0
Operating lease costs 111  
Cash paid for amounts included in measurement of operating lease liabilities $ 94  
Incremental borrowing rate 9.76%  
Weighted average remaining lease term 3 years 4 months 24 days  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
Remaining in 2019 $ 293  
2020 234  
2021 229  
2022 134  
Total remaining lease payments 890  
Less: imputed interest (118)  
Total lease liabilities $ 772  
Minimum [Member]    
Lessee, Operating Lease, Description [Abstract]    
Remaining lease term 1 year  
Maximum [Member]    
Lessee, Operating Lease, Description [Abstract]    
Remaining lease term 4 years