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Debt (Tables) | 6 Months Ended
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Jun. 30, 2015
Debt | Debt at June 30, 2015, consisted of the following (in thousands):
|  | June 30, 2015 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Loan and Security Agreement |  | $ | 20,000 |  |  | $ | (106 | ) |  | $ | 19,894 |
Less: debt—current |  |  | (2,568 | ) |  |  | 45 |  |  |  | (2,523 | )
Debt—non-current |  | $ | 17,432 |  |  | $ | (61 | ) |  | $ | 17,371 |
Debt at December 31, 2014, consisted of the following (in thousands):
|  | December 31, 2014 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Loan and Security Agreement |  | $ | 10,000 |  |  | $ | (128 | ) |  | $ | 9,872 |
Less: debt—current |  |  | — |  |  |  | — |  |  |  | — |
Debt—non-current |  | $ | 10,000 |  |  | $ | (128 | ) |  | $ | 9,872 |
Expected Principal and Interest Payments on Debt | Principal and interest payments on debt at June 30, 2015, are expected to be as follows * (in thousands):
Year ended December 31, |  | Principal |  |  | Interest |  |  | Total |
2015 |  | $ | — |  |  | $ | 640 |  |  | $ | 640 |
2016 |  |  | 5,226 |  |  |  | 1,231 |  |  |  | 6,457 |
2017 |  |  | 5,603 |  |  |  | 854 |  |  |  | 6,457 |
2018 |  |  | 6,007 |  |  |  | 450 |  |  |  | 6,457 |
2019 |  |  | 3,164 |  |  |  | 1,465 |  |  |  | 4,629 |
Total |  | $ | 20,000 |  |  | $ | 4,640 |  |  | $ | 24,640 |
* | Unless interest only period extends to December 31, 2016, as described below.

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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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