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Income Taxes - Net Deferred Tax Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets    
Stock-based compensation $ 2,440 $ 2,774
Federal, state and local net operating loss carryforwards 2,907 1,207
Accrued compensation and other accrued expenses 664 846
Allowance for doubtful accounts 329 43
Basis difference arising from discounted note payable 11 316
Foreign tax credit 219 148
Charitable contribution carryover 63 60
Property and equipment 321 180
Total deferred tax assets 6,954 5,574
Deferred tax liabilities    
Basis difference arising from intangible assets of acquisition (10,006) (13,008)
Total deferred tax liabilities (10,006) (13,008)
Net deferred tax liabilities $ (3,052) $ (7,434)