Fair Value Measurements Financial instruments with significant Level 3 inputs (Details) - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	May. 08, 2014	Oct. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	$ 5,349,400		$ 7,080,000
Percentage of Net Sales					10.00%
Percentage of license cost					30.00%
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	13,880,000		18,260,000	$ 11,900,000
Accrued Liabilities and Other Liabilities	13,880,000		18,260,000
Change in acquisition-related contingent consideration	(4,380,000)	$ 1,090,000
Fair Value, Option, Changes in Fair Value, Gain (Loss)	(4,380,000)
Contingent Consideration Classified as Equity [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	13,880,000		18,260,000
Change in acquisition-related contingent consideration	(4,380,000)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	0		0
Contingent Consideration Classified as Equity, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	5,349,400		7,080,000
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	0		0
Contingent Consideration Classified as Equity, Fair Value Disclosure	0		0
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale Securities	0		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Accrued Liabilities and Other Liabilities	13,880,000		18,260,000
Contingent Consideration Classified as Equity, Fair Value Disclosure	13,880,000		$ 18,260,000
Amorcyte, LLC [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Acquisition-related contingent consideration	$ 0