Stock-Based Compensation and Stock Purchase Plans - Summary of Status of Stock Option Plans (Detail) (Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Options [Member]
Summary of the status of stock option plans
Options outstanding, shares, beginning balance	3,897
Options granted, shares	920
Options exercised, shares	(20)
Options cancelled, shares	(64)
Options outstanding, shares, ending balance	4,733	3,897
Options exercisable, shares	2,905	2,500	2,200
Options outstanding, weighted-average exercise price, beginning balance	$ 9.62
Options granted, weighted-average exercise price	$ 4.80
Options exercised, weighted-average exercise price	$ (6.10)
Options cancelled, weighted-average exercise price	$ (6.74)
Options outstanding, weighted-average exercise price, ending balance	$ 8.74	$ 9.62
Options exercisable, weighted-average exercise price	$ 9.85	$ 10.12	$ 10.15
Options outstanding, remaining contractual life	2 years 1 month 6 days	2 years 7 months 6 days
Options exercisable, remaining contractual life	1 year 3 months 18 days
Options outstanding, aggregate intrinsic value	$ 0	$ 3,064
Options exercisable, aggregate intrinsic value	$ 0