Schedule of Accrued Liabilities (Detail) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]
Employee compensation	$ 3,031,594	$ 3,634,839
Royalty and license fees	1,499,419	1,459,680
Contingent consideration	1,107,977	1,376,877
Unearned revenue	475,120	599,120
Professional fees	161,420	418,800
VAT liabilities	131,494	98,162
Research and development	123,000	18,300
Other accrued expenses	2,207,589	692,212
Total	$ 8,737,613	$ 8,297,990