Stock-Based Compensation - Summary of Stock Option Activity (Detail) - Stock Options [Member]	3 Months Ended
	Mar. 31, 2017 $ / shares shares
Summary Of Stock Option Activities [Line Items]
Options Outstanding, Beginning balance, Shares | shares	825,561
Options Outstanding, Expired or cancelled | shares	(44,520)
Options Outstanding, Forfeited | shares	(16,773)
Options Outstanding, Ending balance, Shares | shares	764,268
Options Exercisable, Ending balance, Shares | shares	719,195
Options Outstanding, Beginning balance, Weighted Average Exercise Price | $ / shares	$ 7.30
Weighted Average Exercise Price, Expired or Cancelled | $ / shares	8.84
Weighted Average Exercise Price, Forfeited | $ / shares	5.84
Options Outstanding, Ending balance, Weighted Average Exercise Price | $ / shares	7.24
Options Outstanding, Exercisable at End of Year, Weighted Average Exercise Price | $ / shares	$ 7.27