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INCOME TAXES (Schedule of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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INCOME TAXES [Abstract] |  |
Net operating loss and credit carryforwards | $ 15,941 | $ 13,989
Allowance for doubtful accounts | 986 | 666
Stock-based compensation | 461 | 292
Other | 39 |
Gross deferred tax assets | 17,427 | 14,947
Property and equipment | (94) | (95)
Intangible assets | (3,849) | (4,148)
Gross deferred tax liabilities | (3,943) | (4,243)
Net deferred tax assets | 13,484 | 10,704
Less valuation allowance | (13,484) | (10,704)
Net deferred liability | $ 0 | $ 0

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