9.         Notes Payable, net

BoC Term Loan

In August 2020, the Company entered into a loan agreement (the "BoC Loan Agreement") with Pacific Western Bank, which merged with the Banc of California (the "Lender") in 2024. The Company received a loan in the principal amount of $2,000 (the "BoC Term Loan") that bore interest on the outstanding daily balance at a rate equal to the greater of: (a) 0.50% above the variable rate of interest announced by the Lender as its “prime rate” then in effect; or (b) 4.50%. The BoC Loan Agreement created a first priority security interest with respect to substantially all assets of the Company, including proceeds of intellectual property, but expressly excluding intellectual property itself.

The Company was required to pay accrued interest on the current loan on the 13th day of each month through and including August 13, 2023, at which time the unpaid principal and accrued and unpaid interest was due and payable in full. On August 17, 2023, the Company entered into an amendment to the BoC Loan Agreement, extending the maturity date to August 13, 2026 with interest only payments until such date, having daily borrowings bearing interest at a variable annual rate equal to the greater of the Lender's "prime rate" then in effect and 4.50%, and caused the Company to maintain all of its depository, operating, and investment accounts with the Lender. The Company determined this amendment constituted a loan modification under ASC 470, and used the updated imputed interest rate to recalculate debt discounts, debt issuance costs and final payment to be amortized over the new term.

The BoC Loan Agreement contains a liquidity covenant, which requires that the Company maintain cash in accounts of the Lender or subject to control agreements in favor of the Lender in an amount equal to at least the outstanding balance of the BoC Term Loan, which was $2,000 as of September 30, 2024. It also contains a primary depository covenant, which restricts the Company from having more than $1,000 held in subsidiary bank accounts outside of the United States. As of September 30, 2024, the Company was compliant with all covenants.

The interest rate of the BoC Term Loan is subject to increase in the event of late payment and after occurrence of and during the continuation of an event of default. The Company may elect to prepay the BoC Term Loan at any time, in whole or in part, without penalty or premium.

The debt issuance costs and debt discounts combined with the stated interest resulted in an effective interest rate of 8.67% and 9.00% for the three months ended September 30, 2024 and 2023, respectively, and 8.71% and 8.80% for the nine months ended September 30, 2024 and 2023, respectively. The debt issuance costs and debt discounts are amortized to interest expense using the effective interest method over the life of the loan. Interest expense for the BoC Term Loan totaled $44 and $45 for the three months ended September 30, 2024 and 2023, respectively, and $130 and $132 for the nine months ended September 30, 2024 and 2023, respectively.

The following table presents scheduled principal payments of the Company’s BoC Term Loan as of September 30, 2024:

Parker Hannifin Promissory Note

In connection with the HMC Acquisition, on December 5, 2022, the Company delivered a $5,000 unsecured, subordinated promissory note (the "Promissory Note") to Parker. The Promissory Note, subordinate to the BoC Term Loan, bears no interest with principal payable in sixteen equal installments due on the last day of each quarter, which commenced on December 31, 2023 and matures on September 30, 2027. 

The Promissory Note, upon the occurrence of an event of default, allows for the levying of interest equal to the lesser of (a) 5% per annum and (b) the maximum interest rate permitted under applicable law on the then entire outstanding principal balance, and also for the acceleration of all outstanding liabilities and obligations, making them immediately payable. Under the terms of the Promissory Note, the following occurrences constitute a default, and could, upon written notice or declaration by Parker, allow for the levying of interest and or the acceleration of principal outstanding: (i) failure to pay any amount of the principal when due and payable, (ii) the dissolution of the Company (including the declaration of bankruptcy), and (iii) the acquisition of the Company by another entity or the sale of substantially all of its assets to another entity.

The Company recorded the Promissory Note of $4,055 in its condensed consolidated balance sheets under the captions Notes Payable, Current and Notes Payable, Net, estimating an implicit discount rate of 7.5% via reference to the interest charged on the Company's BoC Term Loan and other relevant economic factors present at the execution date of the Promissory Note. The amortization of debt discounts resulted in an effective interest rate of 7.00% and 7.31% for the three months ended September 30, 2024 and 2023, respectively, and 7.52% and 7.31% for the nine months ended September 30, 2024 and 2023, respectively. The debt discount is amortized to interest expense using the effective interest method over the life of the loan. Interest expense on the Promissory Note was $66 and $81 for the three months ended September 30, 2024 and 2023, respectively, and $210 and $239 for the nine months ended September 30, 2024 and 2023, respectively.

The following table presents scheduled principal payments of the Company's Promissory Note as of September 30, 2024: