Income Taxes - Income Tax Provision/(Benefit) and Deferred Income Taxes (Details Textual) - USD ($)	3 Months Ended		12 Months Ended
	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Line Items]
Undistributed Earnings of Foreign Subsidiaries			$ 40,000,000
Correction of immaterial error related to R&D credit recorded within income tax provision				$ 1,200,000	$ 6,100,000	$ 1,800,000
Maximum amount of the R&D credit error in any individual tax year between 2009 – 2014				1,900,000
Deferred income tax assets benefits percentage			100.00%
Valuation allowance			$ 17,414,000	20,507,000
Deferred income tax assets related to state income tax jurisdictions			2,700,000
Deferred income tax assets related to foreign income tax jurisdictions			29,700,000
Valuation allowance against deferred tax assets related to state jurisdictions			2,500,000
Valuation allowance against deferred tax assets related to foreign jurisdictions			14,900,000
Cash payments related to the deferred income tax liabilities associated with the 2004 Convertible Debt Securities	$ 6,000,000	$ 6,000,000	5,600,000
Balance owed U.S. Tax Authorities related to deferred income tax liabilities associated with the 2004 Convertible Debt Securities repurchased			$ 18,000,000
Payment period of balance owed U.S. Tax Authorities related to deferred income tax liabilities associated with the 2004 Convertible Debt Securities repurchased			3 years
Domestic Country
Income Taxes [Line Items]
Valuation allowance			$ 0
Operating loss carryforward			$ 50,000,000	51,000,000
Operating Loss Carryforwards, Expiration Dates			begin to expire in 2019 and can be utilized through 2030
Interest rate used for tax deduction						9.09%
State And Local Jurisdiction
Income Taxes [Line Items]
Operating loss carryforward			$ 63,000,000	63,000,000
Operating Loss Carryforwards, Expiration Dates			will expire beginning in 2016 and end in 2036
Foreign Country
Income Taxes [Line Items]
Operating loss carryforward			$ 91,000,000	$ 96,000,000
Operating Loss Carryforwards, Expiration Dates			2017