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Income Taxes (Components Of Net Deferred Income Tax Assets And Net Deferred Income Tax Liabilities) (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]      
Intangibles $ 40,014,000 $ 46,293,000  
Stock options and restricted stock awards 14,384,000 22,010,000  
Reserves and allowances 20,022,000 18,738,000  
Net operating loss carryforwards 29,398,000 16,796,000  
Tax credit carryforwards 13,571,000 8,610,000  
Accrued liabilities 5,330,000 4,943,000  
Deferred revenue 3,502,000 405,000  
Valuation allowance (109,913,000) (107,312,000) $ 0
Total deferred income tax assets 16,308,000 10,483,000  
Intangibles 16,968,000 22,676,000  
Property, plant and equipment 8,818,000 3,851,000  
Total deferred income tax liabilities 25,786,000 26,527,000  
Net deferred income tax liabilities $ (9,478,000) $ (16,044,000)