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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

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