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Note Payable and Term Loan Agreement - Note Payable (Details) - USD ($) |  |  | 1 Months Ended | 2 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Nov. 12, 2014 | Oct. 05, 2012 | Oct. 31, 2012 | Aug. 31, 2012 | Oct. 05, 2012 | Dec. 31, 2015 | Dec. 31, 2014 | Nov. 13, 2014 | Dec. 31, 2013
Note Payable |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 3,988,619 | $ 6,812,315 |  |
Interest Paid |  |  |  |  |  | 3,525,978 | 3,912,463 |  |
Interest Expense. |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Non-cash expense |  |  |  |  |  | 462,000 | 86,000 |  |
PDL and Three Peaks |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | $ 3,526,000 | $ 6,724,000 |  |
Revenue Interest Purchase Agreement | Three Peaks |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Royalty percentage on net revenue | 3.75% |  |  |  |  |  |  |  |
Minimum annual payment amounts |  |  |  |  |  |  |  |  |
Term | 10 years |  |  |  |  | 10 years |  |  |
Revenue Interest Purchase Agreement | Three Peaks | Maximum |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Royalty percentage on net revenue | 4.80% |  |  |  |  |  |  |  |
Revenue Interest Purchase Agreement | PDL |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Payment to extinguish royalty contract | $ 30,300,000 |  |  |  |  |  |  |  |
Minimum annual payment amounts |  |  |  |  |  |  |  |  |
Term |  | 8 years |  |  |  |  |  |  |
Internal rate of return on funded amount |  |  |  |  |  |  |  |  | 20.00%
Funded amount |  |  | $ 19,050,000 | $ 1,750,000 | $ 20,800,000 |  |  |  |
Term Loan | Three Peaks |  |  |  |  |  |  |  |  |
Note Payable |  |  |  |  |  |  |  |  |
Total debt | $ 25,000,000 |  |  |  |  |  |  |  |
Interest rate stated (as a percent) | 9.00% |  |  |  |  |  |  |  |
Basis spread on fixed rate, option 1 | LIBOR |  |  |  |  |  |  |  |
Basis spread on fixed rate, option 2 | 1.00% |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  | 10.00% | 10.00% | 10.00% |
Minimum annual payment amounts |  |  |  |  |  |  |  |  |
Term | 6 years |  |  |  |  |  |  |  |

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