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Debt | 12 Months Ended
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Dec. 31, 2016
Debt Disclosure [Abstract] |
Debt | Debt Credit Agreement In March 2016, the Company entered into a credit agreement (the “Credit Agreement”) with Visium Healthcare Partners, LP (“Visium”). Under the Credit Agreement, two term loans are available to the Company with an aggregate principal amount of up to $40.0 million. The Company drew down the initial $25.0 million term loan (the “Initial Term Loan”) on March 30, 2016, of which $5.0 million was used to pay the outstanding balance of the Company’s existing long-term debt, which was cancelled at that date. On or prior to June 30, 2017, the Company may request the second term loan of up to $15.0 million (the “Second Term Loan” and together with the Initial Term Loan, the “Term Loans”). The Term Loans mature on March 31, 2022. The Term Loans bear interest at a fixed rate of 12.0% per annum, payable quarterly at the end of each March, June, September and December. No principal payments will be due during an interest-only period, commencing on the funding date for the Initial Term Loan (the “Initial Borrowing Date”) and continuing through and including March 31, 2020. The Company is obligated to repay the outstanding principal amounts under the Term Loans in eight equal installments during the final two years under the Credit Agreement. For any quarterly interest payment through and including the 16th interest payment date after the Initial Borrowing Date, so long as no event of default has occurred and is then continuing, the Company may elect to pay interest in cash on the outstanding principal amounts of the Term Loans at a fixed rate of 9.0%, with the remaining 3.0% of the 12.0% interest paid-in-kind by adding such paid-in-kind interest to the outstanding principal amounts of the Term Loans. The Company elected to pay interest in-kind for the quarters ended June 30, 2016 and September 30, 2016 and has recorded $385,000 of paid-in-kind interest through December 31, 2016. The Company may prepay the outstanding principal amount under the Term Loans subject to a minimum of $5.0 million of principal amount or a whole multiple of $1 million in excess thereof plus accrued and unpaid interest and a prepayment premium. The prepayment premium will be assessed on the principal amount repaid and will equal (i) 24.0% less the aggregate amount of all interest payments in cash, if the prepayment is made on or prior to March 31, 2018, (ii) 4.0%, if the prepayment is made after March 31, 2018 and on or prior to March 31, 2019, (iii) 2.0%, if the prepayment is made after March 31, 2019 and on or prior to March 31, 2020, and (iv) 1.0%, if the prepayment is made after March 31, 2020 and on or prior to March 31, 2021. After March 31, 2021 there is no prepayment premium. The Company’s obligations under the Credit Agreement are secured by a security interest in substantially all of its assets. The Credit Agreement contains customary representations, warranties and events of default, as well as affirmative and negative covenants. The negative covenants include, among other provisions, covenants that limit or restrict the Company’s ability to incur liens, make investments, incur indebtedness, merge with or acquire other entities, dispose of assets, make dividends or other distributions to holders of its equity interests, engage in any material new line of business or enter into certain transactions with affiliates, in each case subject to certain exceptions. To the extent the Company forms or acquires certain subsidiaries domiciled in the United States, those subsidiaries are required to be guarantors of the Company’s obligations under the Credit Agreement. As of December 31, 2016, the Company was in compliance with the loan covenants. Concurrent with entering into the Credit Agreement, the Company entered into an agreement with Visium pursuant to which, for a period of one year following the Initial Borrowing Date, Visium has the right to participate in certain future equity financings of the Company in an amount of up to $5.0 million with no preferential terms. As of December 31, 2016, the net debt obligation for borrowings made under the Credit Agreement was as follows (in thousands of dollars):
| December 31, 2016
Debt principal | $ | 25,385 |
Unamortized debt issuance costs | (467 | )
Net debt obligation | $ | 24,918 |
Future principal payments under the Credit Agreement are as follows (in thousands of dollars):
Year Ending December 31, |
2020 | $ | 9,519 |
2021 | 12,693 |
2022 | 3,173 |
Total | $ | 25,385 |
Loan and Security Agreement In June 2013, the Company entered into a loan and security agreement ("Original Loan") with a financial institution. The Original Loan provided for term loans of up to $10.0 million in aggregate. The Company drew down $5.0 million in funds under the agreement in June 2013, and did not draw the remaining $5.0 million on or before the expiration date of March 31, 2014. The Company was required to repay the outstanding principal in 30 equal installments beginning 18 months after the date of the borrowing and was due in full in June 2017. The Original Loan had an interest rate of 6.06% per annum, carried prepayment penalties of 2.25% and 1.50% for prepayment within one and two years, respectively, and 0.75% thereafter. In December 2014, the Company amended certain terms and conditions of the Original Loan ("Amended Loan"). The Amended Loan provided for term loans of up to $15.0 million in aggregate, in three tranches of $5.0 million each. The Company borrowed $5.0 million under the first tranche in December 2014 and used the funds for repayment of the $5.0 million in principal outstanding under the Original Loan, in a cashless transaction. In addition, the Company paid the accrued but unpaid interest of $14,000 due on the Original Loan and the related end-of-term payment of $110,000. The Amended Loan waived the prepayment premium of $75,000 under the Original Loan and reduced the end-of-term payment of $225,000 under the Original Loan to $110,000. In November 2015, the Company further amended the loan to extend the availability of the second $5.0 million tranche under the Amended Loan through June 30, 2016 from December 31, 2015 originally. The carrying value of the debt approximated its fair value because the interest rate approximated market rates that the Company could have obtained for debt with similar terms. Under the Amended Loan borrowing, the Company was required to repay the outstanding principal in 24 equal installments beginning 24 months after the date of the borrowing and was due in full in December 2018. The first tranche of the Amended Loan bore interest at a rate of 5.00% per annum. The Amended Loan carried prepayment penalties of 2.00% and 1.00% for prepayments within one and two years, respectively, and no prepayment penalty thereafter. In connection with the Amended Loan, the Company paid approximately $45,000 in third-party fees. The Amended Loan resulted in a debt modification under ASC 470-50, Modifications and Extinguishments, as the change in present value of the remaining cash flows associated with the Original Loan and Amended Loan was not substantial. Upon execution of the Original Loan, the Company issued the financial institution a warrant to purchase shares of Series C convertible preferred stock at $7.56 per share. At the time of issuance, the aggregate fair value of the warrant for the 24,801 shares exercisable under the warrant was $175,000. The fair value of the warrant was deducted from total proceeds, resulting in a debt discount to be amortized to interest expense over 48 months, through the maturity date of the Original Loan, using the effective interest rate method, and was recorded as a preferred stock warrant liability. The warrant was converted to a warrant to purchase the Company's common stock upon the completion of the Company's IPO. The financial institution exercised the warrant with respect to 24,801 shares through a cashless exercise in March 2014, resulting in the issuance of 13,739 shares of the Company's common stock. Borrowings under the 2013 Loan Agreement totaled $5.0 million, which was outstanding at January 1, 2015 and into 2016 until such amount was repaid upon the Company entering into the Credit Agreement discussed above. As of December 31, 2015, the net debt obligation under the Amended Loan was as follows (in thousands of dollars):
| 2015
Debt and unpaid accrued end-of-term payment | $ | 5,082 |
Unamortized note discount | (92 | )
Net debt obligation | $ | 4,990 |
Interest Expense Interest expense was as follows (in thousands of dollars):
| Year Ended December 31,
| 2016 |  | 2015 |  | 2014
Nominal interest | $ | 2,378 |  |  | $ | 253 |  |  | $ | 296 |
Amortization and write-off of debt discount and debt issuance costs | 173 |  |  | 46 |  |  | 62 |
End-of-term payment interest and prepayment penalty | 206 |  |  | 79 |  |  | 81 |
Total | $ | 2,757 |  |  | $ | 378 |  |  | $ | 439 |

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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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