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Commitments and Contingencies - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended		1 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	May 01, 2007 Bedford, Massachusetts	Dec. 31, 2011 Bedford, Massachusetts sqft	May 01, 2007 Bedford, Massachusetts Maximum Phase	Dec. 30, 2009 AbanoTerme, Italy sqft
Commitments and Contingencies Disclosure [Line Items]
Area of leased space					134,000		26,000
Lease term				10 years 6 months			6 years
Number of periods up to which lease term can be extended						4
Lease and rental expense	$ 2,486,849	$ 3,479,632	$ 2,888,277

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Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

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