Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use assets	$ 4,400
Lease liabilities	$ 4,833
Accounting Standards Update 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use assets		$ 5,000
Lease liabilities		$ 5,400