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Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating losses $ 181,300 $ 223,800
Research and development credits 71,900 62,200
Capitalized research and development 28,000 34,800
Share-based compensation expense 22,900 17,300
Operating lease assets 23,300 100
Intangible assets 49,300 9,400
Other 18,500 19,100
Total deferred tax assets 395,200 366,700
Deferred tax liabilities:    
Convertible senior notes (24,100) (26,400)
Operating lease liabilities (18,200)  
Other (6,900) (5,100)
Total deferred tax liabilities (49,200) (31,500)
Net of deferred tax assets and liabilities 346,000 335,200
Valuation allowance $ (346,000) $ (335,200)