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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Net operating loss and credit carryforward $ 10,506 $ 11,634
Operating lease liabilities 3,337 2,632
State income taxes 70 100
Accruals and allowances 1,374 327
Stock-based compensation 1,651 643
Unrealized foreign exchange losses 176 900
Deferred revenue 87 0
Capital loss carryforward 410 0
Total deferred tax assets 17,611 16,236
Valuation allowance (10,145) (11,634)
Total deferred tax assets net of valuation allowance 7,466 4,602
Deferred tax liabilities:    
Deferred revenue 0 (72)
Operating lease right-of-use assets (1,908) (2,423)
Property, equipment and intangible assets (848) (56)
Total deferred tax liabilities (2,756) (2,551)
Net deferred tax assets $ 4,710 $ 2,051