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Note 8 - Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net federal and state operating losses $ 117,787 $ 158,618
Research and development credits 55,208 53,231
Deferred revenue 1,854 3,484
Stock-based compensation 6,424 8,952
Other 2,046 2,849
Total deferred tax assets 183,319 227,134
Deferred tax liabilities:    
Fixed assets (421) (674)
Foreign currency derivative (478) (1,415)
Total deferred tax liabilities (899) (2,089)
Valuation allowance (182,420) (225,045)
Net deferred tax assets