Leases - Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating Lease Liabilities, Payments Due [Abstract]
2020 (remaining 9 months)	$ 1,533
2020 (remaining 12 months)		$ 1,986
2021	2,292	1,957
2022	2,230	1,894
2023	2,287	1,951
2024	2,300	2,010
Thereafter	5,103	5,101
Total lease payments	15,745	14,899
Less imputed interest	(2,908)	(2,825)
Total operating lease liabilities	12,837	12,074
Assets and Liabilities, Lessee [Abstract]
Current portion of operating lease liabilities	1,383	1,322
Operating lease liabilities, net of current portion	11,454	10,752
Total operating lease liabilities	$ 12,837	$ 12,074