Development and License Agreements - Additional Information (Detail) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Licenses Agreements [Line Items]
Royalty payments on products									$ 2,700,000	$ 2,200,000	$ 2,000,000
Payments made relating to the manufacturing of the products									12,200,000	9,600,000	8,600,000
Product warranty receivable current	1,800,000								1,800,000
Revenue from cooperative agreement	0	0	0	91,000	527,000	1,479,000	0	436,000	91,000	2,442,000	1,432,000
Royalty
Licenses Agreements [Line Items]
Royalties owed	800,000				700,000				800,000	700,000
Manufacturing Costs
Licenses Agreements [Line Items]
Royalties owed	$ 6,200,000				$ 3,400,000				$ 6,200,000	$ 3,400,000
Platelet system | Royalty
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products									10.00%
Plasma system | Royalty
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products									3.00%
Red blood cell system | Royalty
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products									5.00%
Illuminators | Royalty
Licenses Agreements [Line Items]
Royalty rate applied towards sale of products									6.50%