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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