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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 9,805 | $ 9,250
State income taxes | 82 | 65
Accruals and allowances | 292 | 287
Stock based compensation | 910 | 744
Unrealized foreign exchange losses | 151 | 191
Deferred revenue | 377 | 87
Deferred rent | 0 | 418
Total deferred tax assets | 11,617 | 11,042
Valuation allowance | (9,723) | (9,249)
Total deferred tax assets net of valuation allowance | 1,894 | 1,793
Deferred tax liabilities: |  |
Deferred rent | (80) | 0
Property, equipment and intangible assets | (169) | (277)
Total deferred tax liabilities | (249) | (277)
Net deferred tax assets | $ 1,645 | $ 1,516

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