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Income Taxes - Deferred and Valuation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets    
Intellectual property $ 48,339 $ 44,573
Amortization/depreciation 3,732 3,082
Research tax credit 96,509 43,382
Net operating loss carry forwards 248,398 221,912
Deferred revenue 4,401 6,158
Non-cash stock issue 16,850 10,751
Interest carry forward limitation 1,032 0
Others 10,852 7,328
Gross deferred tax assets 430,113 337,186
Deferred tax liabilities    
Business acquisition (6,465) (6,465)
Royalty payable (48,339) (44,573)
Convertible notes (16,666) (18,991)
Advanced R&D payments (2,103) (3,069)
Total net deferred tax assets 356,540 264,088
Less: valuation allowance (363,005) (270,553)
Net deferred tax liability (6,465) $ (6,465)
Increase in the valuation allowance $ (92,400)