Commitments and Contingencies - Additional Information (Details) - USD ($)			3 Months Ended
		Feb. 01, 2019	Mar. 31, 2019	Mar. 31, 2018	Oct. 01, 2016
Other Commitments [Line Items]
Claims or payments to agreements			$ 0
Accrual made in consolidated financial statements			$ 0
Operating leases, contract term					4 years
Company or sublessee, prior notice period for cancellation of sublease agreement			4 months
Expected annual sublease income		$ 400,000
Lease expenses	[1]		$ 583,000
Short-term lease expense			100,000
Sublease income			100,000	$ 100,000
General and Administrative Expense
Other Commitments [Line Items]
Lease expenses			$ 700,000	$ 500,000

[1] Amounts have not been reduced by sublease income of $0.1 million recognized during the three months ended March 31, 2019.