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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