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Components of Net Deferred Tax Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforwards $ 712,124 $ 721,588
Research and development credits 77,998 73,646
Capitalized research 5,117 5,872
Payments from collaboration   52,484
Milestone Rights 3,242 3,242
Accrued expenses 440 251
Loss on purchase commitment 36,775 24,084
Non-qualified stock option expense 17,331 16,941
Capitalized patent costs 8,781 8,574
Other 7,380 7,186
Depreciation 45,310 48,755
Total net deferred tax assets 914,498 962,623
Valuation allowance (914,498) (962,623)
Net deferred tax assets $ 0 $ 0