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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 11,634 | $ 9,805
Operating lease liabilities | 2,632 | 0
State income taxes | 100 | 82
Accruals and allowances | 327 | 292
Stock-based compensation | 643 | 910
Unrealized foreign exchange losses | 900 | 151
Deferred revenue | 0 | 377
Total deferred tax assets | 16,236 | 11,617
Valuation allowance | (11,634) | (9,723)
Total deferred tax assets net of valuation allowance | 4,602 | 1,894
Deferred tax liabilities: |  |
Deferred revenue | 72 | 0
Deferred rent | 0 | (80)
Operating lease right-of-use assets | (2,423) | 0
Property, equipment and intangible assets | (56) | (169)
Total deferred tax liabilities | (2,551) | (249)
Net deferred tax assets | $ 2,051 | $ 1,645

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