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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Net operating losses $ 24,219 $ 8,220
License fees 5,122 2,279
Stock-based compensation 4,999 1,964
Legal fees 1,436 757
Other 1,249 494
Total deferred tax assets 37,025 13,714
Valuation allowance (37,025) (13,714)
Net deferred tax assets $ 0 $ 0