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Income taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accrued Expense $ 625 $ 849
Amortization 2,116 46
Depreciation 1,749 2,968
Federal tax credits 80,961 74,475
State tax credits 7,148 4,996
Federal net operating losses 61,068 80,061
State net operating losses 11,884 9,672
Capitalized research and development costs 3,332 7,248
Other 18,815 22,125
Total gross deferred tax assets 187,698 202,440
Less valuation allowance (177,631) (183,015)
Total deferred tax assets, net of valuation allowance 10,067 19,425
Deferred tax liabilities:    
Convertible debt (9,927) (19,190)
OCI unrealized gains (140) (235)
Total gross deferred tax assets (10,067) (19,425)
Net deferred tax assets (liabilities) $ 0 $ 0