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INCOME TAXES - Deferred Tax Assets (Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Loss and credit carryforwards $ 1,888 $ 4,779
Stock-based compensation 1,603 1,004
Other 745 1,133
Total deferred tax assets 4,236 6,916
Valuation allowance (3,837) (6,472)
Total deferred tax assets, net of valuation allowance 399 444
Deferred tax liabilities:    
Property and equipment (278) (245)
Other (121) (199)
Total deferred tax liabilities (399) (444)
Net deferred tax assets $ 0 $ 0