Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities	$ 9,146
Right-of-use asset	$ 7,043
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease liabilities		$ 10,400
Operating lease liabilities, current		1,700
Operating lease liabilities, noncurrent		8,700
Right-of-use asset		$ 8,000