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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Net operating loss and tax credit carryforwards | $ 37,841 | $ 37,899
Stock based compensation | 641 | 648
Investment in affiliates | 299 | 264
Other | 18 | 14
Depreciation and amortization | 20 | 37
Deferred tax assets gross | 38,819 | 38,862
Less - valuation allowance | (27,500) | (38,780)
Net deferred tax assets | 11,319 | 82
Deferred tax liabilities: |  |
Goodwill amortization | (9) | (103)
Net deferred tax liabilities | (9) | (103)
Net deferred tax assets (liabilities) | $ 11,310 |
Net deferred tax assets (liabilities) |  | $ (21)

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