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Components of Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating losses $ 238,500 $ 309,100
Research and development credits 47,500 38,800
Capitalized research and development 47,500 80,200
Share-based compensation expense 14,600 17,400
Deferred revenue 2,800 4,300
Deferred gain on sales leaseback 2,100 3,800
Intangibles 1,700 4,800
Cease-use expense 0 300
Fixed assets 0 400
Other 8,000 4,400
Total deferred tax assets 362,700 463,500
Deferred tax liabilities:    
Convertible debt (31,300) 0
Fixed assets (500) 0
Total deferred tax liabilities (31,800) 0
Net of deferred tax assets and liabilities 330,900 463,500
Valuation allowance (330,900) (463,500)
Net deferred tax assets $ 0 $ 0