7. Debt

L2 Capital Debt

On January 31, 2018, the Company signed a promissory note in the aggregate principal amount of up to $0.84 million (the “L2 Note”) for an aggregate purchase price of up to $0.75 million and warrants to purchase up to an aggregate of 68,257 shares of common stock of the Company (the “Warrants”) at an exercise price of $3.31 per share. The maturity date is six months from date of funding. The L2 Note bears interest at a rate of 8% per year and a default interest rate of 18% per year. The L2 Note may be converted by the holder of the L2 Note at any time following an event of default. The conversion price of the L2 Note in the event of a default is equal to the product of (i) 0.70 multiplied by (ii) the lowest volume weighted average price, or VWAP, of the Company’s common stock during the 20-day trading period ending in the holder of the L2 note’s sole discretion on the last complete trading day prior to conversion, or, the conversion date.

On May 14, 2018, the Company closed on an underwritten public offering of units, consisting of convertible preferred stock and warrants, for gross proceeds of $15.0 million. Part of the proceeds from this offering were used to pay off the outstanding debt with L2 Capital. The total payoff amount totaled $1.1 million, with a net of $0.7 in principal and $0.4 in interest.

Hercules and MEF I, LP/Anson Investments Debt Exchange

On January 3, 2018, the Company entered into an Assignment Agreement (the “Assignment Agreement”) with MEF I, LP and Anson Investments Master Fund (collectively the “Assignees” and each an “Assignee”), Hercules Technology III, L.P. (“HT III”) and Hercules Capital, Inc. (“HC” and, together with HT III, “Hercules”), pursuant to which Hercules assigned to the Assignees all amounts remaining due under the Loan and Security Agreement, dated June 30, 2014, as amended, between the Company and Hercules (the “Loan and Security Agreement”) and (2) the note (the “Hercules Note”) between the Company and Hercules evidencing the amounts due under the Loan and Security Agreement. The total amount assigned by Hercules to the Assignees in the aggregate was $2,264,623 and is secured by the same collateral underlying the Loan and Security Agreement. Subsequently, the Company entered into an exchange agreement pursuant to which the Assignees agreed to exchange the Hercules Term Loan obligation acquired by them for two senior secured convertible promissory notes issued by the Company, each in the principal amount of $1.1 million for an aggregate principal amount of $2.2 million, (the “Exchange Notes”). The Exchange Notes will mature on February 3, 2019 (the “Maturity Date”). The Exchange Notes bear interest at a rate of 15% per annum. Prior to the Maturity Date, principal and interest accrued under the Exchange Notes is payable in cash or, if certain conditions are met, payable in shares of common stock of the Company. All principal accrued under the Exchange Notes are convertible into shares of the Company’s common stock (“Conversion Shares”) at the election of the holders at any time at a fixed conversion price of $3.87 per share. Upon the occurrence of an event of default, the Assignees are entitled to convert all or any part of their Exchange Notes at a conversion price (the “Alternate Conversion Price”) equal to 70% of the lowest traded price of the Company’s common stock during the ten trading days prior to the conversion date, provided that (i) in no event may the Alternate Conversion Price be less than $1.75 per share and (ii) the Assignees shall not be entitled to receive more than 19.99% of the outstanding common stock. So long as these Exchange Notes remain outstanding or the Assignees hold any Conversion Shares, the Company is prohibited from entering into any financing transaction pursuant to which the Company sells its securities at a price lower than $1.75 per share. The Exchange Notes are secured by a first priority security interest in substantially all assets, including intellectual property, of the Company and contains covenants restricting payments to certain Company affiliates.

On May 14, 2018, the Company closed on an underwritten public offering of units, consisting of convertible preferred stock and warrants, for gross proceeds of $15.0 million. Part of the proceeds from this offering were used to pay off the outstanding debt with MEF I, L.P. and Anson Investments. The total payoff was $1.6 million, with $1.4 million in principal and $0.2 million in interest.

North Stadium Term Loan – Related Party (Extension)

In July 2018, the Company entered into an extension to the term loan with North Stadium Investments, LLC. The extension moved the due date of the loan from July 28, 2018 to October 28, 2018, at which time all principal and unpaid interest are due and payable. The monthly interest only payments will continue through the payoff on October 28, 2018.

North Stadium Term Loan – Related Party

On July 28, 2017, the Company entered into a $2.5 million term loan (the “North Stadium Loan”) with North Stadium Investments, LLC (“North Stadium”), a company owned and controlled by the Company’s Chief Executive Officer and Chairman of the Board. The North Stadium Loan bears interest at 10% per annum and requires the Company to make monthly interest only payments from September 5, 2017 through July 5, 2018. All principal and unpaid interest (if any) under the Loan are due and payable on July 28, 2018. The North Stadium Loan is secured by substantially all of the Company’s assets but is junior to the security interest in assets encumbered by the Hercules Term Loan now held by MEF I and Anson Investments. In connection with the North Stadium Loan, the Company also issued North Stadium a warrant to purchase up to 55,000 shares of the Company’s common stock at a purchase price of $5.04 per share, subject to a 5-year term. The relative estimated value of the warrants on the date of grant approximated $0.2 million, was recorded as a debt discount and is being amortized as interest expense over the life of the term loan.

Hercules Term Loan

On June 30, 2014, the Company entered into a Loan and Security Agreement with Hercules which provided the Company with a $20.0 million term loan. The Hercules Term Loan matured on January 1, 2018. The Hercules Term Loan included a $0.2 million closing fee, which was paid to Hercules on the closing date of the loan. The closing fee was recorded as a debt discount and was amortized to interest expense over the life of the loan. The Hercules Term Loan also included a non-refundable final payment fee of $1.7 million. The final payment fee was accrued and recorded to interest expense over the life of the loan. On January 3, 2018, the Hercules Term Loan and all amounts owing thereunder were assigned to MEF I and Anson Investments. See discussion above for a more detailed description of that transaction.

See discussion below with respect to the assignment of $3.0 million of the principal balance of the Hercules Term Loan to Riverside Merchant Partners, LLC (“Riverside”) and the subsequent agreement between the Company and Riverside to exchange the $3.0 million of the Hercules Term Loan held by Riverside for subordinated convertible promissory notes in the aggregate principal amount of $3.0 million.

Hercules and Riverside Debt Exchange

On April 4, 2016, the Company entered into an Assignment and Second Amendment to Loan and Security Agreement (the “Assignment Agreement”) with Riverside and Hercules, pursuant to which Hercules sold $1.0 million of the principal amount outstanding under the Hercules Term Loan to Riverside. In addition, pursuant to the terms of the Assignment Agreement, Riverside acquired an option to purchase an additional $2.0 million of the principal amount outstanding under the Hercules Term Loan from Hercules. Riverside subsequently exercised its option in full and acquired the additional $2.0 million of the outstanding principal amount of the Hercules Term Loan.

Long-term debt consisted of the following (in thousands):