Contractual Obligations and Commitments - Summary of Annual Maturities of Operating Lease Liabilities (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Commitments And Contingencies Disclosure [Abstract]
Remainder of 2019 Years ended December 31,	$ 1,921
2020	2,422
2021	2,370
2022	2,403
2023	2,400
Thereafter	11,961
Total minimum lease payments	23,477
Less:Imputed interest	(7,153)
Operating lease liabilities	$ 16,324	[1]

[1] Current portion of $1.3 million included in other current liabilities and the difference of $15 million included in long-term portion of lease liabilities on our condensed consolidated balance sheet.