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Note 9 - Income Taxes - Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Net operating loss carryforward $ 138,727 $ 94,465
Research and development credits 16,687 11,181
Stock-based compensation 10,272 6,726
Other, net 3,204 1,345
Total deferred tax assets 168,890 113,717
Valuation allowance for net deferred tax assets (168,890) (113,717)
Net deferred taxes