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Income Taxes (Components of Net Deferred Income Tax Assets and Net Deferred Income Tax Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Intangibles $ 22,530 $ 24,232
Stock options and restricted stock awards 5,916 5,988
Reserves and allowances 15,656 11,308
Net operating loss carryforwards 41,356 35,004
Tax credit carryforwards 13,669 10,908
Accrued liabilities 3,040 3,011
Deferred revenue 5,036 4,629
Valuation allowance (95,398) (80,796)
Total deferred income tax assets 11,805 14,284
Deferred income tax liabilities:    
Intangibles 6,994 11,301
Property, plant and equipment 5,265 7,304
Liabilities related to distributions 997 0
Other 522 642
Total deferred income tax liabilities 13,778 19,247
Net deferred income tax liabilities $ (1,973) $ (4,963)