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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:      
Employee compensation accruals $ 1,386 $ 1,279  
Accrued liabilities 343 633  
Research tax credits 22 3,796  
Other 55 66  
Net operating losses 6,194 77,906  
Total deferred tax assets 8,000 83,680  
Deferred tax liabilities:      
Beneficial conversion feature 906    
Total deferred tax liabilities 906 0  
Valuation allowance 7,094 83,680 $ 81,223
Net deferred tax assets $ 0 $ 0