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Income Taxes - Deferred Tax Asset (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets |  |
Net operating loss carryforward | $ 4,417 | $ 6,024
Capital loss carryover | 7,481 | 4,442
GAAP/Tax basis differences | 317 | 814
Total deferred tax assets | 12,215 | 11,280
Deferred tax liabilities |  |
GAAP/Tax basis differences | 6,247 | 2
Total deferred tax liabilities | 6,247 | 2
Valuation allowance | (4,993) | (9,503)
Total net deferred tax asset | $ 975 | $ 1,775

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