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Long Term Debt/ Note Payable (Parenthetical) (Detail) (USD $) |  |  | 12 Months Ended |  |  |  | 3 Months Ended | 12 Months Ended |  |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Loan And Security Agreement | Sep. 30, 2012 Loan And Security Agreement | Dec. 31, 2011 Loan And Security Agreement | Sep. 30, 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 | Mar. 31, 2013 Minimum Revenue Interest Purchase Agreement | Dec. 31, 2012 Minimum Revenue Interest Purchase Agreement | Mar. 31, 2013 Maximum Revenue Interest Purchase Agreement | Dec. 31, 2012 Maximum 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 |  |  |  |
Principal and interest payable |  |  | 30 months |  |  |  |  |  |  |  |  |  |  |
Royalty payable on net revenues |  |  |  |  |  |  | 9.95% | 9.95% |  |  |  |  |  |
Interest payable |  |  | 9.90% |  |  | 9.90% |  |  |  |  |  |  |  |
Varying amount |  |  |  |  |  |  |  |  |  |  | 1,300,000 | 1,300,000 | 2,500,000 | 2,500,000
Minimum contractual payments related to the note payable in 2014 |  |  |  |  |  |  | 1,250,805 | 1,250,805 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2015 |  |  |  |  |  |  | 6,781,440 | 6,781,440 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2016 |  |  |  |  |  |  | 9,232,642 | 9,232,642 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2017 |  |  |  |  |  |  | 9,000,000 | 9,000,000 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2018 |  |  |  |  |  |  | 9,000,000 | 9,000,000 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2019 |  |  |  |  |  |  | 9,063,000 | 9,063,000 |  |  |  |  |  |
Minimum contractual payments related to the note payable in 2020 |  |  |  |  |  |  | $ 6,939,000 | $ 6,939,000 |  |  |  |  |  |

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