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Income Taxes (Schedule of Deferred Tax Assets, Net) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Accruals and reserves $ 2,499 $ 2,242
Stock-based compensation 2,443 2,960
Intangible assets 448 1,464
Net operating losses 12,055 9,337
Tax credits 3,569 4,399
Other 178 70
Total deferred tax assets 21,192 20,472
Deferred Tax Liabilities, Net [Abstract]    
Commissions receivable (64,911) (93,538)
Intangible assets 1,083 2,133
Fixed assets (55) 0
Total deferred tax liabilities 66,049 95,671
Net deferred tax liabilities $ (44,857) $ (75,199)