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INCOME TAXES - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 37,899 | $ 37,440
Stock based compensation | 648 | 502
Investment in affiliates | 264 | 482
Deferred Revenue - Advance payment | 0 | 64
Other | 14 | 213
Depreciation and amortization | 37 | 0
Deferred tax assets gross | 38,862 | 38,701
Less - valuation allowance | (38,780) | (38,601)
Net deferred tax assets | 82 | 100
Deferred tax liabilities: |  |
Depreciation and amortization | 0 | (55)
Goodwill amortization | (103) | (56)
Net deferred tax liabilities | (103) | (111)
Net deferred tax assets (liabilities) | $ (21) | $ (11)

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