Leases - Operating Lease, Maturity of Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
The remainder of 2019			$ 2,370
2020			4,104
2021			3,338
2022			1,346
2023			661
Thereafter			583
Total undiscounted cash flows			12,402
Less imputed interest			(594)
Present value of lease liabilities			$ 11,808	$ 13,300
Gross Minimum Lease Payments [Abstract]
2019					$ 4,974
2020					3,882
2021					3,248
2022					1,168
2023					488
Total payments					13,760
Minimum Sublease Income [Abstract]
2019					(72)
2020					(74)
2021					(77)
2022					0
2023					0
Total payments					(223)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019					4,902
2020					3,808
2021					3,171
2022					1,168
2023					488
Total payments					$ 13,537
Rent expense	$ 1,200	$ 2,500