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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss carryforwards $ 364,864 $ 508,406
Research and other credits 94,103 74,917
Stock-based compensation 14,552 26,357
Property, plant and equipment 6,848 6,882
Reserves and accruals 5,659 12,269
Capitalized research expenses 5,497 11,587
Deferred revenue 3,796 23,035
Sale of future royalties 0 1,611
Other 1,156 750
Deferred tax assets before valuation allowance 496,475 665,814
Valuation allowance for deferred tax assets (496,191) (665,514)
Total deferred tax assets 284 300
Total deferred tax liabilities 0 0
Net deferred tax assets $ 284 $ 300