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Income Taxes - Summary of Provision (Benefit) for Income Taxes Reconciles to Amount Computed by Applying Statutory Federal Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Federal tax benefit, at statutory rate	$ (14,732)	$ (30,142)	$ (11,694)
State benefit, net of federal benefit	(922)	(757)	(733)
Change in valuation allowance	15,577	27,486	14,612
Tax expense/(benefit) from business combination	0	0	909
Research and development credits	(1,084)	(856)	(1,731)
Share-based compensation	2,433	1,616	526
Uncertain tax positions	(307)	(46)	(11,809)
Goodwill impairment	0	3,700	596
Change in state apportionment	(767)	0	0
Other	(115)	(390)	(179)
Provision (benefit) for income taxes	$ 83	$ 611	$ (9,503)

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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