BioOne Acquisition - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		12 Months Ended
	Feb. 28, 2011	Aug. 31, 2010	Dec. 31, 2012	Dec. 31, 2010
Business Acquisition [Line Items]
Business acquisition, common stock shares issued	234,471	937,886
Business acquisition, close date		Aug. 24, 2010
Business acquisition, total consideration provided				$ 3.7
Business acquisition, fair value common stock shares issued				3.4
Business acquisition, fair value of non-controlling equity interest relinquished				0.3
Business acquisition, gain recognized				0.3
Business acquisition, carrying value of investment				0
Business acquisition, investment percentage				13.00%
Business acquisition, estimated fair value of acquired assets excluding goodwill				2.4
Business acquisition, acquisition related costs				$ 0.5
Business acquisition, intangible assets estimated useful life			10 years
Common Stock Issuable
Business Acquisition [Line Items]
Business acquisition, common stock shares issued		1,172,357