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Related Party Transactions - Schedule of Related Party Transactions (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Related Party Transaction [Line Items]
Product revenues		$ 1,426,890		$ 3,590,073
Royalties	887,553	904,839	2,524,466	2,232,397
Collaborative Arrangement [Member]
Related Party Transaction [Line Items]
Product revenues		1,426,890		3,590,073
Royalties	887,553	904,839	2,524,466	2,232,397
Total revenues	887,553	2,331,729	2,524,466	5,822,470
Cost of product revenues		1,297,043		3,263,376
Gross profit	$ 887,553	$ 1,034,686	$ 2,524,466	$ 2,559,094

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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