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Debt (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt Disclosure [Abstract] |
Outstanding Long-Term Debt | Outstanding long-term debt consisted of the following (in thousands):
| June 30, 2015 |  | December 31, 2014
| Outstanding Principal |  | Unamortized Discount |  | Net Carrying Amount |  | Outstanding Principal |  | Unamortized Discount |  | Net Carrying Amount
Hercules Term Loan | 20,000 |  |  | (752 | ) |  | $ | 19,248 |  |  | $ | 20,000 |  |  | $ | (930 | ) |  | $ | 19,070 |
Convertible Note | 4,298 |  |  | (1,001 | ) |  | 3,297 |  |  | 4,500 |  |  | (1,439 | ) |  | 3,061 |
Total debt | 24,298 |  |  | (1,753 | ) |  | 22,545 |  |  | 24,500 |  |  | (2,369 | ) |  | 22,131 |
Less: Current portion | (20,798 | ) |  | 1,032 |  |  | (19,766 | ) |  | (20,000 | ) |  | 930 |  |  | (19,070 | )
Long-term debt | $ | 3,500 |  |  | $ | (721 | ) |  | $ | 2,779 |  |  | $ | 4,500 |  |  | $ | (1,439 | ) |  | $ | 3,061 |
Future Principal Payments on Debt | The following summarizes by year the future principal payments as of June 30, 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 |
Total future principal payments | $ | 20,000 |  |  | $ | 4,298 |  |  | $ | 24,298 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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