Stockholders' Equity - Summary of Non-Vested Stock Options (Detail) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period	655,547
Nonvested, Shares, Granted	684,629
Nonvested, Shares, Vested	(207,797)
Nonvested, Shares, Forfeited	(238,034)
Nonvested at end of period	894,345
Weighted Average Grant Date Fair Value, Nonvested at December 31, 2015 | $ / shares	$ 9.12
Nonvested at December 31, 2015, Aggregate Intrinsic Value | $	$ 10