Lease - Schedule of Reconciliation of Future Undiscounted Cash Flows to Operating Lease Liabilities After Adoption of 842 (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Operating Lease Liabilities, Payments Due [Abstract]
2019 (excluding the nine months ended September 30, 2019)	$ 2,473
2020	8,287
2021	5,956
2022	4,712
2023	4,029
Thereafter	9,711
Total future lease payments	35,168
Less: imputed interest	(4,543)
Total operating lease liabilities	30,625
Less: current portion of lease liabilities	(8,429)	$ 0
Long-term portion of operating lease liabilities	$ 22,196	$ 0