Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended
	Jan. 01, 2019	Mar. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets		$ 2,645
Operating lease liabilities		$ 2,793
Lease term		12 months
Notice period for cancellation of agreement		30 days
Other Assets
Summary Of Significant Accounting Policies [Line Items]
Deferred offering costs			$ 1,500
Adoption of Topic 842
Summary Of Significant Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 2,900
Operating lease liabilities	3,000
Derecognized the deferred rent liability	$ (100)