Stockholders’ Equity (Detail) - Activity Under Equity Award Plans And Related Information $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Shares Available for Grant - Outstanding, beginning balance (in shares)	3,159,000
Number of Shares - Outstanding, beginning balance (in shares)	2,340,000
Shares Available for Grant - Shares authorized (in shares)	2,000,000	[1]
Number of Shares - Options exercised (in shares)	(60,000)
Shares Available for Grant - Options forfeited/canceled	77,000
Number of Shares - Options forfeited/canceled (in shares)	(77,000)
Share Available for Grant - Restricted stock units granted (in shares)	(2,466,000)
Shares Available for Grant - Restricted stock units forfeited (in shares)	366,000
Shares Available for Grant - Outstanding, ending balance (in shares)	3,354,000
Number of Shares - Outstanding, ending balance (in shares)	2,203,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted-Average Exercise Price - Outstanding, beginning balance (in dollars per share) | $ / shares	$ 11.11
Weighted Average Exercise Price - Options exercised (in dollars per share) | $ / shares	4.28
Weighted-Average Exercise Price - Options forfeited/canceled (in dollars per share) | $ / shares	$ 13.18
Shares Available for Grant - Restricted stock units withheld related to net-share settlement of restricted stock units (in shares)	218,000
Weighted-Average Exercise Price - Outstanding, ending balance (in dollars per share) | $ / shares	$ 11.22
Outstanding (weighted-average contractual life)	4 years 6 months
Outstanding (intrinsic value) | $	$ 1,940
Vested and exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Vested and exercisable (shares)	2,148,000
Vested and exercisable (in dollars per share) | $ / shares	$ 11.30
Vested and exercisable (weighted-average contractual life)	4 years 6 months
Vested and exercisable (intrinsic value) | $	$ 1,867
Vested and expected to vest
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Vested and expected to vest (shares)	2,202,000
Vested and expected to vest (in dollars per share) | $ / shares	$ 11.23
Vested and expected to vest (weighted-average contractual life)	4 years 6 months
Vested and expected to vest (intrinsic value) | $	$ 1,938

[1] In the first quarter of 2016, the Company reserved an additional 2.0 million shares of its common stock for future issuance under the 2011 Plan.