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INCOME TAXES - Components of Net Deferred Tax Asset and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Net operating loss carryforwards $ 40,736 $ 52,311
Accruals and reserves 17,576 14,668
Software revenue 0 0
Depreciation 2,874 2,558
Tax credit carryforwards 14,896 13,056
Other 176 52
Total deferred tax assets 76,258 82,645
Valuation allowances (27,954) (27,994)
Total net deferred tax assets 48,304 54,651
Deferred tax liabilities:    
Software revenue (36,510) (70,347)
Intangibles (5,748) (8,527)
Total deferred tax liabilities (42,258) (78,874)
Deferred income taxes $ 6,046  
Deferred income taxes   $ (24,223)