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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deferred tax assets: |  |
Property and equipment | $ 15 | $ 12
Accruals and reserves | 199 | 1,104
Deferred rent | 931 | 1,565
Compensation and benefits | 11,973 | 16,048
Deferred revenue | 4,762 | 3,255
Net operating loss and credits | 41,108 | 45,625
Other | 167 | 180
Total deferred tax assets | 59,155 | 67,789
Valuation allowance | (58,639) | (67,225)
Total deferred tax assets | 516 | 564
Deferred tax liabilities: |  |
Property and equipment | (440) | (403)
Other deferred tax liabilities | (76) | (161)
Deferred tax liabilities | (516) | (564)
Total | 0 | $ 0
Decrease in deferred tax asset, net due to Tax Cuts and Jobs Act of 2017 | 22,900 |
Decrease in valuation allowance due to Tax Cuts and Jobs Act of 2017 | $ 22,900 |

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