Leases - Schedule of Maturities of Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2019 (remaining)	$ 2,919
2020	3,861
2021	3,765
2022	3,753
2023	3,776
Thereafter	1,354
Total undiscounted lease payments	19,428
Less: imputed interest	(3,057)
Total lease liabilities	$ 16,371