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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 9,250 | $ 7,239
State income taxes | 65 | 159
Accruals and allowances | 287 | 447
Stock based compensation | 744 | 771
Unrealized foreign exchange losses | 191 | 149
Deferred revenue | 87 | 113
Deferred rent | 418 | 625
Total deferred tax assets | 11,042 | 9,503
Valuation allowance | (9,249) | (7,168)
Total deferred tax assets net of valuation allowance | 1,793 | 2,335
Deferred tax liabilities: |  |
U.S. tax on undistributed earnings | 0 | (173)
Property, equipment and intangible assets | (277) | (351)
Total deferred tax liabilities | (277) | (524)
Net deferred tax assets | $ 1,516 | $ 1,811

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