Significant Accounting Policies and Recent Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Accounting Policies [Line Items]
Operating Lease ROU assets	$ 5,970
Operating lease liability	$ 6,139
ASU 2016-02
Accounting Policies [Line Items]
Operating Lease ROU assets		$ 5,800
Operating lease liability		$ 5,900