Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Statutory federal corporate tax rate									35.00%
Valuation allowance	$ 1,872				$ 1,746				$ 1,872	$ 1,746
Pre-tax loss	(5,822)	$ (327)	$ (30,607)	$ (8,374)	458	$ (4,524)	$ 690	$ 804	(45,130)	(2,572)	$ 9,723
DTA related to net operating loss carryforwards	24,208				6,859				$ 24,208	6,859
DTA related to operating loss carryforwards expiration, description									do not expire until 2031 through 2036
AMT carryforwards	$ 2,015				$ 2,015				$ 2,015	$ 2,015
Change in the total valuation allowance											$ 22,400