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Income taxes (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Accrued Expense $ 849 $ 848
Amortization 46 57
Depreciation 2,968 2,631
Federal tax credits 74,475 50,850
State tax credits 4,996 3,356
Federal net operating losses 80,061 75,200
State net operating losses 9,672 8,848
Capitalized research and development costs 7,248 8,917
Other 22,125 10,345
Total gross deferred tax assets 202,440 161,052
Less valuation allowance (183,015) (139,584)
Total deferred tax assets, net of valuation allowance 19,425 21,468
Deferred tax liabilities:    
Convertible debt (19,190) (21,468)
Gain on marketable securities (235) 0
Total gross deferred tax assets (19,425) (21,468)
Net deferred tax assets (liabilities) $ 0 $ 0