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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Net operating loss and credit carryforward $ 9,175 $ 10,506
Operating lease liabilities 2,797 3,337
State income taxes 0 70
Accruals and allowances 1,461 1,374
Stock-based compensation 545 1,651
Unrealized foreign exchange losses 273 176
Deferred revenue 70 87
Capital loss carryforward 410 410
Total deferred tax assets 14,731 17,611
Valuation allowance (8,717) (10,145)
Total deferred tax assets net of valuation allowance 6,014 7,466
Deferred tax liabilities:    
Operating lease right-of-use assets (1,600) (1,908)
Property, equipment and intangible assets (465) (848)
Total deferred tax liabilities (2,065) (2,756)
Net deferred tax assets $ 3,949 $ 4,710