Outstanding Long-Term Debt |
Outstanding long-term debt consisted of the following (in thousands): | | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2015 | | December 31, 2014 | | Outstanding Principal | | Unamortized Discount | | Net Carrying Amount | | Outstanding Principal | | Unamortized Discount | | Net Carrying Amount | Hercules Term Loan | $ | 20,000 |
| | $ | (843 | ) | | $ | 19,157 |
| | $ | 20,000 |
| | $ | (930 | ) | | $ | 19,070 |
| Convertible Note | 4,298 |
| | (1,188 | ) | | 3,110 |
| | 4,500 |
| | (1,439 | ) | | 3,061 |
| Total debt | 24,298 |
| | (2,031 | ) | | 22,267 |
| | 24,500 |
| | (2,369 | ) | | 22,131 |
| Less: Current portion | (20,000 | ) | | 843 |
| | (19,157 | ) | | (20,000 | ) | | 930 |
| | (19,070 | ) | Long-term debt | $ | 4,298 |
| | $ | (1,188 | ) | | $ | 3,110 |
| | $ | 4,500 |
| | $ | (1,439 | ) | | $ | 3,061 |
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Future Principal Payments on Debt |
The following summarizes by year the future principal payments as of March 31, 2015 (in thousands): | | | | | | | | | | | | | Years Ending December 31, | Hercules Term Loan | | Magna Convertible Notes | | Total | 2015 | $ | 2,949 |
| | $ | — |
| | $ | 2,949 |
| 2016 | 7,666 |
| | 4,298 |
| | 11,964 |
| 2017 | 8,567 |
| | — |
| | 8,567 |
| 2018 | 818 |
| | — |
| | 818 |
| 2019 | — |
| | — |
| | — |
| Total future principal payments | $ | 20,000 |
| | $ | 4,298 |
| | $ | 24,298 |
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