Amendments to the Accounting Standards Codification - Additional Information (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2019 USD ($)
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right of use asset	$ 4,410
Operating lease liability	4,732
ASU 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Operating lease right of use asset	3,500
Operating lease liability	3,800
Cumulative effect adjustment	$ 45