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Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating losses $ 223,800 $ 238,500
R&D credits 62,200 47,500
Capitalized R&D 34,800 47,500
Share-based compensation 17,300 14,600
Other 28,600 14,600
Total deferred tax assets 366,700 362,700
Deferred tax liabilities:    
Convertible senior notes (26,400) (31,300)
Fixed assets (5,100) (500)
Total deferred tax liabilities (31,500) (31,800)
Net of deferred tax assets and liabilities 335,200 330,900
Valuation allowance (335,200) (330,900)
Net deferred tax assets $ 0 $ 0