Additional Information on Operating Leases (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)
Operating Lease Cost
Operating leases	$ 657	$ 1,258
Short-term lease	16	47
Total lease expense	$ 673	1,305
Cash payments included in operating cash flows		$ 609
Weighted average discount rate	9.42%	9.42%
Weighted average remaining lease term in years	5 years 9 months	5 years 9 months