Income Taxes - Summary of Changes in Unrecognized Tax Benefit (Including Interest and Penalties) (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
UTB, Beginning Balance	$ 168
UTB, Lapse of the applicable statute of limitations	(54)
UTB, Ending Balance	114
Interest/Penalties, Beginning Balance	14
Interest/Penalties, Lapse of the applicable statute of limitations	(7)
Interest/Penalties, Ending Balance	7
Total, Beginning Balance	182
Total, Lapse of the applicable statute of limitations	(61)
Total, Ending Balance	$ 121