Schedule of Accrued Liabilities (Detail) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Employee compensation	$ 3,302,618	$ 2,741,738
Royalty and license fees	1,078,661	499,776
Unearned revenue	476,827	469,046
VAT liabilities	228,353	566,542
Professional fees	225,351	871,086
Research and development	9,000	142,695
Other accrued expenses	631,059	715,155
Accrued liabilities	7,269,086	6,041,038
Contingent Consideration
Schedule of Accrued Liabilities [Line Items]
Other accrued expenses	$ 1,317,217	$ 35,000