Debt | 5. Debt Equipment Line of Credit In June 2013, the Company entered into a Loan and Security Agreement (“Equipment Line of Credit”) with Silicon Valley Bank that provided for cash borrowings for equipment of up to $1.0 million, secured by the equipment financed. Under the terms of the agreement, interest was the greater of 5% or 4.6% above the U.S. Treasury Note as of the date of each borrowing. Interest only payments were due on borrowings through December 31, 2013, with both interest and principal payments commencing in January 2014. Any equipment advances after December 31, 2013 were subject to principal and interest payments immediately over a 30-month period following the advance. In June 2014, the equipment loan was paid in full, the Company had no further obligations thereunder, and the bank released its security interest in such assets. The Company recorded approximately $61,000 in interest expense related to the Equipment Line of Credit during the six months ended June 30, 2014. Loan and Security Agreement In June 2014, the Company entered into a $15,000,000 loan and security agreement (“Agreement”) under which the lenders provided the Company a term loan, which was funded at closing. The interest rate is 7.07% per annum. Under the Agreement, the Company makes interest only payments on the outstanding amount of the loan on a monthly basis through July 2015, after which equal monthly payments of principal and interest are due until the loan maturity date of July 1, 2018. Included in the Agreement was a provision to extend the interest only payment to February 1, 2016 upon the Company’s receipt of unrestricted net cash proceeds from the sale of equity securities of not less than $30 million by June 30, 2015. In June 2015, the Company entered into an amendment to the Agreement (“Amendment”), which reduced the amount of unrestricted net cash proceeds to not less than $21 million from the sale of equity securities to qualify for an interest extension. The Company met the conditions in the Amendment related to the interest extension, as a result, the interest only payments that were to expire on August 1, 2015 have been extended for six months to February 1, 2016, when both interest and principal payments will commence. The loan is secured by a security interest in all of the Company’s assets except intellectual property, which is subject to a negative pledge. In connection with the loan, the lenders received a warrant to purchase an aggregate 85,470 shares of the Company’s common stock at an exercise price of $3.51 per share exercisable for ten years from the date of issuance. The original value of the warrants, totaling $235,857, was recorded as debt discount and additional paid-in capital as the warrants were equity classified. As of June 30, 2015, a warrant to purchase 42,735 shares of common stock remains outstanding. At the Company’s option, it may prepay all of the outstanding principal balance, subject to certain pre-payment fees ranging from 1% to 3% of the prepayment amount. In the event of a final payment of the loans under the loan agreement, either in the event of repayment of the loan at maturity or upon any prepayment, the Company is obligated to pay the amortized portion of the final fee of $1,050,000. The Company is also subject to certain affirmative and negative covenants under the Agreement, including limitations on its ability to: undergo certain change of control events; convey, sell, lease, license, transfer or otherwise dispose of any equipment financed by loans under the loan agreement; create, incur, assume, guarantee or be liable with respect to indebtedness, subject to certain exceptions; grant liens on any equipment financed under the loan agreement; and make or permit any payment on specified subordinated debt. In addition, under the Agreement, subject to certain exceptions, the Company is required to maintain with the lender its primary operating, other deposit and securities accounts. Furthermore, under the amendment to the Agreement, the Company is required to be in compliance with healthcare laws and regulations and terms and conditions of healthcare permits. The Company was in compliance with all covenants as of June 30, 2015. As of June 30, 2015, amounts due under the Agreement include $2,320,084 in current liabilities and $12,881,673 in long-term liabilities. The Company recorded $780,341 in interest expense related to the Agreement during the six months ended June 30, 2015. Future minimum principal payments under the loan and security agreement are as follows: June 30, 2015 $ — 2016 2017 2018 Total long-term obligations $ |