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Income Taxes - Components of Net Deferred Tax Amounts (Details) (10-K) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 262 | $ 228
Accrued expenses | 209 | 125
Net operating loss | 17,935 | 15,313
Research and experimentation credits | 1,349 | 562
Stock-based compensation | 2,446 | 559
Interest | 1,072 | 832
Deferred revenue | 91 | 137
Unrealized exchange gain | 1 | 2
Leases | 1,560 | 1,775
Other credits | 51 | 464
Total deferred tax assets | 24,976 | 19,997
Valuation allowance | (18,256) | (6,576)
Deferred tax assets, net of valuation allowance | 6,720 | 13,421
Deferred tax liabilities: |  |
Property and equipment | 846 | 733
Prepaid expenses | 574 | 179
Leases | 1,686 | 1,821
Intangibles | 6,478 | 17,598
Total deferred tax liabilities | 9,584 | 20,331
Net deferred tax liability | $ 2,864 | $ 6,910

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