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Income Taxes - Significant Components of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:      
Employee compensation accruals $ 796 $ 84  
Accrued liabilities 361    
Research tax credits 346 135  
Lease obligation 265 206  
Other 87 72  
Net operating losses 19,742 14,502  
Total deferred tax assets 21,597 14,999  
Deferred tax liabilities:      
Right of use asset 265 206  
Total deferred tax liabilities 265 206  
Valuation allowance 21,332 14,793 $ 11,364
Net deferred tax assets $ 0 $ 0