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Difference Between Provision for Income Taxes and Amounts Computed by Applying Federal Statutory Income Tax Rate to Loss before Taxes (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Provision of Income Taxes [Line Items]
Federal statutory tax									$ (14,661)	$ (5,329)	$ (5,725)
Stock-based compensation									(10)	99	83
Lobbying expenses									107	51	112
Warrants									4,926	(706)	(165)
Foreign rate differential									(121)	(53)	(68)
Expiration of federal net operating losses and credits-tax effected										4,352	1,744
Change in valuation allowance									9,934	1,761	4,158
Goodwill amortization									21	48
Other									22	19	4
Provision for income taxes	$ 53	$ 60	$ 54	$ 51	$ 111	$ 55	$ 41	$ 35	$ 218	$ 242	$ 143

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