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Commitments - Summary of Lease Costs (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
USD ($)
Lease expense:  
Operating lease expense $ 55
Finance lease expense:  
Depreciation of right-of-use assets 33
Total lease expense 88
Cash payment information:  
Operating cash used for operating leases 55
Financing cash used for financing leases 28
Total cash paid for amounts included in the measurement of lease liabilities $ 83
Weighted-average remaining lease term (years) - operating leases 7 years 3 months 18 days
Weighted-average remaining lease term (years) - finance leases 1 year 9 months 18 days
Weighted-average discount rate - operating leases 8.00%
Weighted-average discount rate - finance leases 5.00%