Leases - Assets and Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Cash paid for amounts included in lease liabilities
Operating cash flows from operating leases	$ 168		$ 333
ROU assets obtained in exchange for lease obligations
Operating leases	3,639		3,639
Lease Cost
Operating leases	213		378
Short-term leases	$ 103		$ 697
Weighted average remaining lease term (years)	5 years 7 months 6 days		5 years 7 months 6 days
Weighted average discount rate (%)	7.10%		7.10%
Rent expense		$ 300		$ 1,000