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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Tax loss carryforwards $ 42,331 $ 38,494
Research and development credits and other tax credits 3,904 3,710
Stock-based compensation 684 531
Other 1,116 1,252
Total deferred tax assets 48,035 43,987
Deferred tax liabilities:    
Operating lease right-of-use assets (74) (154)
Other (6) (12)
Total deferred tax liabilities 80 166
Net deferred tax assets before valuation allowance 47,955 43,821
Valuation allowance (47,955) (43,821)
Net deferred tax asset $ 0 $ 0