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Debt | 12 Months Ended
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Dec. 31, 2015
Debt |
Debt | 6. Debt On June 29, 2012, the Company and its domestic subsidiaries, as co-borrowers, entered into a Loan and Security Agreement with Hercules Technology Growth Capital, Inc. ("Hercules") that allowed the Company to borrow up to $20.0 million ("Loan Agreement") at an interest rate of 9.25%. On December 15, 2014, Company and Hercules entered into a third amendment (the "Third Amendment") to the Loan Agreement. In connection with the Third Amendment, the Company paid a commitment fee of $25,000, and at the closing, paid a facility fee of $125,000. Under the Third Amendment, the amount of borrowings was increased by $5.0 million to an aggregate total of $25.0 million and the interest-only period was extended through December 31, 2015. In December 2015, the Company entered into a fifth amendment to the Loan Agreement, to exercise an option to extend the maturity date to January 1, 2018 with a payment to Hercules of $250,000. The amendment extends the interest-only period, with principal repayments beginning in October 2016. In connection with the Loan Agreement, the Company granted the lender a first position lien on all of the Company's assets, excluding intellectual property. Prepayment of the loans made pursuant to the Loan Agreement is subject to penalty and the Company is required to pay an "end of term" charge of $390,000, which is being charged to interest expense (and accreted to the debt) using the effective interest method over the life of the Loan Agreement. The end of term fee was paid in full as required in January 2016. Debt issuance fees paid to the lender were recorded as a discount on the debt and are being amortized to interest expense using the effective interest method over the life of the Loan Agreement. Debt issuance fees paid to third parties were capitalized and are being amortized to interest expense using the effective interest method over the life of the Loan Agreement. The Loan Agreement also contains representations and warranties by us and the lender and indemnification provisions in favor of the lender and customary covenants (including limitations on other indebtedness, liens, acquisitions, investments and dividends, but no financial covenants), and events of default (including payment defaults, breaches of covenants following any applicable cure period, a material impairment in the perfection or priority of the lender's security interest or in the collateral, and events relating to bankruptcy or insolvency). Upon the occurrence of an event of default, a default interest rate of an additional 5% may be applied to the outstanding loan balances, and the lender may terminate its lending commitment, declare all outstanding obligations immediately due and payable, and take such other actions as set forth in the Loan Agreement. In addition, pursuant to the Loan Agreement, the lender has the right to participate, in an amount of up to $1.0 million, in certain future private equity financing(s) by the Company. In conjunction with entering into the original Loan Agreement in 2012, the Company granted a warrant to the lender to purchase shares of the Company's common stock. Since the warrant was granted in conjunction with entering into the Loan Agreement, the relative fair value of the warrant was recorded as equity and debt discount. On April 30, 2013, the lender exercised the warrant in full. The debt discount is being amortized to interest expense over the term of the related debt using the effective interest method. The following table presents the components of the Company's debt balance as of December 31, 2015:
|  | 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 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 |
​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​
The estimated fair value of the debt (categorized as a Level 2 liability for fair value measurement purposes) is determined using current market factors and the ability of the Company to obtain debt at comparable terms to those that are currently in place. As of December 31, 2015 and 2014, the fair value of the Company's debt approximates the carrying amount.

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- Definition The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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