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Note 8 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net federal and state operating losses $ 158,618 $ 142,836
Research and development credits 53,231 48,551
Fixed assets 1,054
Deferred revenue 3,484 4,240
Stock-based compensation 8,952 8,605
Other 2,849 2,590
Total deferred tax assets 227,134 207,876
Fixed assets (674)
Foreign currency derivative (1,415) (2,668)
Total deferred tax liabilities (2,089) (2,668)
Valuation allowance (225,045) (205,208)
Net deferred tax assets