Difference between Benefit from Income Taxes and Amount Computed by Applying Statutory Income Tax Rate to Income Before Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Benefits from taxes at statutory rate	$ (29,572)	$ (14,786)	$ (42,355)
Rate differential	8,572	9,493	18,494
Change in valuation reserves	8,719	(3,034)	33,106
Derivative liabilities	187	(2,706)	(11,984)
Gain on extinguishment of debt	(328)	(9,509)
Research and development credits	(1,284)	(1,455)	(2,008)
Tax return to provision adjustments	2,248	10,026	125
Cumulative translation adjustment	7,811	8,061	(280)
Permanent and other	561	1,073	1,708
Benefit from income taxes	$ (3,086)	$ (2,837)	$ (3,194)