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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss and credit carryforwards $ 47,991 $ 48,533
Accrued liabilities 3,183 3,801
Allowance for doubtful accounts 416 429
Property and equipment (98)  
Property and equipment   183
Deferred revenue 140 23
Accrued compensation 900 1,183
Intangibles 7 14
Gross deferred tax assets 52,539 54,166
Valuation allowance (52,275) (53,598)
Net deferred tax assets 264 568
Deferred tax liabilities:    
Amortized intangibles (264) (568)
Gross deferred tax liabilities (264) (568)
Net deferred taxes $ 0 $ 0