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Commitments and Contingencies - Lease Cost, Weighted Average Lease Term and Weighted Average Discount Rate (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Leases [Abstract]    
Minimum operating lease payments $ 168 $ 340
Variable operating lease payments 29 62
Short-term operating lease payments 74 144
ROU amortization of finance leases 35 70
Interest expense of finance leases 15 31
Total lease cost $ 321 $ 647
Weighted-average remaining lease term of operating leases 5 years 7 months 6 days 5 years 7 months 6 days
Weighted-average remaining lease term of finance leases 3 years 2 months 12 days 3 years 2 months 12 days
Weighted-average discount rate of operating leases 4.44% 4.44%
Weighted-average discount rate of finance leases 3.50% 3.50%