Acquisitions - Additional Information (Details) (USD $)	1 Months Ended				0 Months Ended	9 Months Ended
	Apr. 30, 2013	Sep. 30, 2013	Dec. 31, 2012	Nov. 06, 2012	Nov. 06, 2012 Phygen, LLC [Member]	Sep. 30, 2013 Phygen, LLC [Member]
Business Acquisition [Line Items]
Number of unregistered shares issued to acquire business					4,069,087
Cash paid at closing of Purchase Agreement					$ 2,000,000
Unregistered shares of common stock placed in escrow account					1,170,960
Inventory step-up reversal period					12 months
Cash paid to set-off for indemnification claims	4,000,000
Closing price of share				$ 1.69
Effective acquisition date						Nov. 06, 2012
Net tangible assets assumed					1,100,000	1,086,000
Acquired intangible assets					8,900,000
Goodwill		181,390,000	180,838,000		8,500,000	8,514,000
Contingent consideration					$ 3,700,000