Leases - Other Information Related to Operating Leases (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Income statement information:
Operating lease cost	$ 958
Short-term lease cost	381
Variable lease cost	994
Total lease cost	2,333
Other information:
Cash paid for operating leases	$ 1,224
Weighted-average remaining lease term (in months)	139 months
Weighted-average discount rate	7.40%