License Agreements - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Licenses Agreements [Line Items]
Royalty payments on products	$ 800,000	$ 700,000	$ 2,300,000	$ 2,100,000
Payments made relating to the manufacturing of the products	4,200,000	1,400,000	11,800,000	8,900,000
Current asset, warrant claim	394,000		394,000		2,038,000
Product Warranty
Licenses Agreements [Line Items]
Current asset, warrant claim	0		0		1,800,000
Royalty
Licenses Agreements [Line Items]
Manufacturing costs owed	700,000		700,000		800,000
Royalty | Platelet system
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products			10.00%
Royalty | Plasma system
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products			3.00%
Royalty | Red blood cell system
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products			5.00%
Royalty | Illuminators
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products			6.50%
Manufacturing Costs
Licenses Agreements [Line Items]
Manufacturing costs owed	$ 4,300,000		$ 4,300,000		$ 6,200,000