Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Cash paid for amounts included in lease liabilities
Operating cash flows from operating leases	$ 83		$ 165
ROU assets obtained in exchange for lease obligations
Operating leases	0		0
Lease Cost
Operating leases	83		165
Short-term leases	$ 299		$ 590
Weighted average remaining lease term (years)	2 years 1 month 6 days		2 years 1 month 6 days
Weighted average discount rate (%)	6.90%		6.90%
Rent expense		$ 346		$ 688