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Long Term Debt/ Note Payable (Detail) (USD $)	Mar. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Sep. 30, 2012 Loan And Security Agreement	Dec. 31, 2011 Loan And Security Agreement	Mar. 31, 2013 Revenue Interest Purchase Agreement	Dec. 31, 2012 Revenue Interest Purchase Agreement	Oct. 05, 2012 Revenue Interest Purchase Agreement	Dec. 31, 2011 Revenue Interest Purchase Agreement
Long-Term Debt / Note payable
Total debt		$ 21,580,252	$ 5,000,000	$ 5,000,000	$ 5,000,000	$ 22,438,404	$ 21,580,252	$ 20,800,000	$ 20,800,000
Less unamortized debt discount			(161,529)
Less current portion			(434,734)
Long-term Notes Payable	$ 22,438,404	$ 21,580,252	$ 4,403,737

The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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