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Difference between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Rate Reconciliation [Line Items]
Income tax benefit at federal statutory rate	$ (22,678)	$ (23,650)	$ (16,523)
State tax	(178)	(89)	(2,586)
Business credits	(2,515)		(1,394)
Deferred compensation charges	3,072	1,002	595
Change in valuation allowance	22,354	21,966	18,099
Change in foreign tax rates			(34)
Change in the fair value measurements			286
Non-deductible debt discount			509
Deemed dividend			273
Prior year true up
Other	(55)	771	775
Total income tax expense

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