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Commitments - Summary of Lease Costs (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Lease expense:    
Operating lease expense $ 176  
Finance lease expense:    
Depreciation of right-of-use assets 33  
Total lease expense 209  
Cash payment information:    
Operating cash used for operating leases 176  
Financing cash used for financing leases 28 $ 0
Total cash paid for amounts included in the measurement of lease liabilities $ 204  
Weighted-average remaining lease term (years) - operating leases 4 years 10 months 24 days  
Weighted-average remaining lease term (years) - finance leases 1 year 9 months 18 days  
Weighted-average discount rate - operating leases 7.30%  
Weighted-average discount rate - finance leases 5.00%