Common Stock and Share-Based Compensation - Summary of Stock Option Activity (Detail)	6 Months Ended
	Jun. 30, 2017 USD ($) $ / shares shares
Options
Options outstanding, beginning balance (in shares) | shares	2,038,829
Forfeited and canceled (in shares) | shares	(557,329)
Exercised (in shares) | shares	(49,879)
Options outstanding, ending balance (in shares) | shares	1,431,621
Weighted Average Exercise Price
Options outstanding, beginning balance, Weighted average exercise price (in dollars per share) | $ / shares	$ 19.78
Forfeited and canceled, Weighted average exercise price (in dollars per share) | $ / shares	26.18
Exercised, Weighted average exercise price (in dollars per share) | $ / shares	15.12
Options outstanding, ending balance, Weighted average exercise price (in dollars per share) | $ / shares	$ 17.45
Options outstanding and exercisable, ending balance, Weighted Average Contractual Life	1 year 1 month 24 days
Options outstanding and exercisable, ending balance, Aggregate Intrinsic Value | $	$ 2,709,128