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Debt (Tables) | 3 Months Ended
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Mar. 31, 2016
Debt | Debt consisted of the following (in thousands):
|  | March 31, 2016 |
|  | Principal |  |  | Unamortized Discount |  |  | Total |
Loan and Security Agreement |  | $ | 20,000 |  |  | $ | (172 | ) |  | $ | 19,828 |
Less: debt—current |  |  | (4,615 | ) |  |  | 88 |  |  |  | (4,527 | )
Debt—non-current |  | $ | 15,385 |  |  | $ | (84 | ) |  | $ | 15,301 |
|  | December 31, 2015 |
|  | Principal |  |  | Unamortized Discount |  |  | Net Carrying Value |
Loan and Security Agreement |  | $ | 20,000 |  |  | $ | (196 | ) |  | $ | 19,804 |
Less: debt—current |  |  | (3,050 | ) |  |  | 94 |  |  |  | (2,956 | )
Debt—non-current |  | $ | 16,950 |  |  | $ | (102 | ) |  | $ | 16,848 |
Expected Principal and Interest Payments on Debt | Principal and interest payments on debt at March 31, 2016, are expected to be as follows * (in thousands):
Year ended December 31, |  | Principal |  |  | Interest |  |  | Total |
2016 |  | $ | 3,050 |  |  | $ | 1,003 |  |  | $ | 4,053 |
2017 |  |  | 6,428 |  |  |  | 980 |  |  |  | 7,408 |
2018 |  |  | 6,892 |  |  |  | 517 |  |  |  | 7,409 |
2019 |  |  | 3,630 |  |  |  | 1,474 |  |  |  | 5,104 |
Total |  | $ | 20,000 |  |  | $ | 3,974 |  |  | $ | 23,974 |
* | 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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