12. Loan and Security Agreement

In September 2013, the Company entered into a $5.0 million loan and security agreement with two banks pursuant to which: (i) the lenders provided the Company a term loan which was funded at closing, (ii) the Company repaid its then outstanding equipment loan balance of $762, and (iii) the lenders received a warrant to purchase an aggregate 31,250 shares of the Company’s common stock at an exercise price of $8.00 per share exercisable for seven years from the date of issuance. The value of the warrants, totaling $215 thousand, was recorded as debt discount and additional paid-in capital.

In March 2014, the Company entered into an amended and restated loan and security agreement, increasing the September 2013 facility to $12.5 million from $5.0 million, with the same two banks. Such loan was funded at closing and was secured by a lien covering substantially all of the Company’s assets, excluding intellectual property, which is subject to a negative pledge. In October 2014, the Company entered into a second amendment to its amended and restated loan and security agreement to extend the interest only payments on the outstanding amount of the loan from October 1, 2014 to May 1, 2015, after which equal monthly payments of principal and interest are due until the loan maturity date of September 30, 2017. The amended and restated loan interest rate is 7.95% per annum, and the Lenders received additional warrants to purchase an aggregate of 34,642 shares of the Company’s common stock at an exercise price of $12.99 per share, exercisable for seven years from the date of issuance. The value of the warrants, totaling $322, was recorded as debt discount and additional paid-in capital.

On the November 22, 2016, the Company paid off all obligations owing under, and terminated, the amended and restated loan and security agreement, as amended (the “Terminated Loan Agreement”). In connection with the repayment and discharge of indebtedness, the Company was required to pay pre-payment fees of approximately $49 thousand, as required by the terms of the Terminated Loan Agreement. The secured interests under the Terminated Loan Agreement were terminated in connection with the Company’s discharge of indebtedness.

On November 23, 2016, the Company and certain of its domestic subsidiaries (together with the Company, the “Borrowers”) entered into a Loan and Security Agreement (the “Loan Agreement”) with Hercules Capital, Inc. (“Hercules”), as a lender and agent for several banks and other financial institutions or entities from time to time party to the Loan Agreement (collectively, the “Lenders”) for a term loan of up to $75.0 million, subject to funding in multiple tranches (the “Term Loan”). The proceeds of the Term Loan will be used for general corporate purposes and coincided with the repayment of the outstanding debt financing arrangement with Oxford Finance LLC and Silicon Valley Bank.

The first tranche of $50.0 million was funded upon execution of the Loan Agreement on November 23, 2016. Under the terms of the Loan Agreement, the Borrowers may, but are not obligated to, request to draw on two additional tranches. The second tranche of up to $10.0 million is available until September 30, 2017, subject to the Borrowers achieving certain fundraising and corporate milestones and satisfying customary conditions. The third tranche of up to $15.0 million is available until June 30, 2018, subject to approval by Hercules’ Investment Committee. The Term Loan will mature on December 1, 2020.

The Loan Agreement contains customary affirmative and restrictive covenants and representations and warranties, including financial reporting obligations and limitations on dividends, indebtedness, liens (including a negative pledge on intellectual property and other assets), collateral, investments, distributions, transfers, mergers or acquisitions, taxes, corporate changes, deposit accounts, and subsidiaries. Additionally, the Loan Agreement contains covenants requiring the Borrowers (i) to achieve certain fundraising requirements by certain dates and (ii) to maintain a minimum amount of unrestricted cash prior to achieving its corporate and fundraising milestones. The breach of such covenants, in addition to certain other covenants, would result in the occurrence of an event of default. The Loan Agreement also contains other customary provisions, such as expense reimbursement, non-disclosure obligations, as well as indemnification rights for the benefit of the Lenders. Upon the occurrence of an event of default and following any applicable cure periods, if any, a default interest rate of an additional 5.00% may be applied to the outstanding loan balances, and the Lenders may declare all outstanding obligations immediately due and payable and take such other actions as set forth in the Loan Agreement.

In connection with the Loan Agreement, the Company issued Hercules a warrant, dated November 23, 2016 (the “Warrant”), to purchase up to 460,123 shares of Common Stock, at an initial exercise price of $4.89, subject to adjustment as provided in the Warrant. The Warrant is initially exercisable for 306,748 shares of common stock of the Company, and may automatically become exercisable for additional shares of common stock on such dates (if any) based upon the funding amounts of Tranche II or Tranche III of the Term Loan that may be extended to the Borrowers. The Warrant will terminate, if not earlier exercised, on the earlier of November 23, 2023 and the closing of certain merger or other transactions in which the consideration is cash, stock of a publicly-traded acquirer or a combination thereof.

Long-term debt and unamortized discount balances are as follows (in thousands):

Face value of loan	$	50,000
Fair value of warrant		(1,377)
Capitalized debt issuance costs		(1,619)
Accretion of debt issuance costs and other		69
Accretion of debt discount		34
Balance at December 31, 2016	$	47,107

Future minimum payments under the loan and security agreement are as follows (in thousands):

Year Ending December 31,
2017		4,914
2018		13,675
2019		22,548
2020		25,411
Total future minimum payments		66,548
Unamortized interest		(16,445)
Debt discount		(1,377)
Capitalized debt issuance costs		(1,619)
Total minimum payment		47,107
Current portion		—
Long-term debt	$	47,107

The Company, the Borrowers and the Lenders entered into an amendment to the Loan Agreement in March 2017. See Note 20 for additional details.