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Note 7 - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Net federal and state operating losses $ 142,836 $ 135,922
Research and development credits 48,551 38,096
Fixed assets 1,054 1,073
Deferred revenue 4,240 3,798
Stock-based compensation 8,605 7,086
Other 2,590 1,178
Total deferred tax assets 207,876 187,153
Foreign currency derivative (2,668) (2,285)
Total deferred tax liabilities (2,668) (2,285)
Valuation allowance $ (205,208) $ (184,868)
Net deferred tax assets