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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Benefits from taxes at statutory rate	$ (29,087)	$ (13,698)	$ (19,039)
Rate differential	9,796	3,071	4,667
Change in valuation reserves	8,728	22,115	13,276
Derivative liabilities	337		(668)
Nondeductible employee compensation	3,058	1,668	1,164
Stock option/RSU windfall	(7,684)	(1,182)
Research and development credits	(1,438)	(1,177)	(1,689)
Tax return to provision adjustments	6,736	5,788	4,524
U.S. rate change—tax reform		7,398
Cumulative translation adjustment	5,711	(12,554)	7,385
Permanent and other	(404)	1,635	(1,573)
Non-deductible interest expense	267	(17)	1,922
Tax reserves	4,956
Long-term debt from royalty-bearing instrument	(880)
Provision for income taxes	$ 96	$ 13,047	$ 9,969

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