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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Employee compensation accruals $ 1,279 $ 1,866
Accrued liabilities 633 1,356
Research tax credits 3,796 3,597
Other 66 45
Net operating losses 77,906 74,359
Total deferred tax assets 83,680 81,223
Deferred tax liabilities:    
Total deferred tax liabilities 0 0
Valuation allowance 83,680 81,223
Net deferred tax assets $ 0 $ 0