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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:      
Employee compensation accruals   $ 292  
Accrued liabilities $ 519 353  
Research tax credits 161 17  
Other 60 34  
Net operating losses 10,624 5,289  
Total deferred tax assets 11,364 5,985  
Deferred tax liabilities:      
Other   13  
Total deferred tax liabilities 0 13  
Valuation allowance 11,364 5,972 $ 7,094
Net deferred tax assets $ 0 $ 0