Other Assets - Additional Information (Detail)	3 Months Ended		12 Months Ended		3 Months Ended		3 Months Ended
	Dec. 31, 2012 USD ($)	Mar. 31, 2010 USD ($)	Sep. 30, 2010 USD ($)	Aug. 31, 2009 USD ($)	Dec. 31, 2012 OctoPlus N.V. EUR (€)	Dec. 31, 2012 Investment in OctoPlus N.V. USD ($)	Dec. 31, 2012 Maximum USD ($)	Dec. 31, 2011 Maximum USD ($)
Other Assets [Line Items]
Cost basis investment in OctoPlus						$ 900,000
Offer price to purchase all issued and outstanding ordinary shares					€ 0.52
Expected gain on sale of investment in the second quarter of fiscal 2013	100,000
Investment in Vessix				2,000,000
Follow-on investment		500,000
Impairment loss on investment			2,400,000
Gain on sale of strategic investment	1,174,000
Potential proceeds on achievement of future milestones							4,200,000
Revenue recognized from activity with companies in which it had strategic investment							$ 100,000	$ 100,000