Schedule of Accrued Liabilities (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]
Employee compensation	$ 2,954,833	$ 2,741,738
Professional fees	592,944	871,086
Royalty and license fees	783,495	499,776
Unearned revenue	480,730	469,046
Research and development	443,200	142,695
VAT liabilities	411,292	566,542
Other accrued expenses	1,481,847	750,155
Accrued liabilities	$ 7,148,341	$ 6,041,038