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Debt (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Debt |
Components of the Company's debt balances |
|  | December 31, 2015 |
|  | (in thousands) |
Debt: |  |  |  |
Notes payable |  | $ | 25,000 |
Accretion of end of term charge |  |  | 390 |
Issuance fees paid to lender |  |  | (250 | )
Current portion of long-term debt |  |  | (3,113 | )
​ | ​ | ​ | ​ | ​
Long-term debt |  | $ | 22,027 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
Future principal repayments of the Notes | Future principal repayments of the Company's long-term debt are as follows (in thousands):
Year Ending in December 31: |  |  |  |
2016 |  | $ | 2,873 |
2017 |  |  | 12,180 |
2018 (due on January 1, 2018) |  |  | 9,947 |
​ | ​ | ​ | ​ | ​
|  | $ | 25,000 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​

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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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