In November 2019, the Company entered into a loan and security agreement with Silicon Valley Bank (“SVB”) pursuant to which SVB agreed to lend to the Company up to $15.0 million in a series of term loans (the “2019 SVB Loan”). Contemporaneously, the Company borrowed $2.5 million in the first of three draw-downs available under the 2019 SVB Loan. In March 2020, the Company borrowed an additional $7.5 million as a second draw. The 2019 SVB Loan was to mature on September 1, 2023 and bore interest at an annual rate equal to the greater of (i) 0.65% above the prime rate or (ii) 5.90%. Payment on the 2019 SVB Loan was for interest only through September 30, 2021. In addition, a final payment equal to the original principal amount of each advance multiplied by 5.50% was to be due on the maturity date. In connection with the 2019 SVB Loan, SVB entered into the SVB Warrant agreement with the Company to purchase shares of Series B convertible preferred stock at an exercise price of $2.3228 per share (see section titled “SVB Warrant” below).

On September 30, 2021, the Company refinanced its 2019 SVB Loan. In connection with the refinancing, the Company entered into an Amended and Restated Loan and Security Agreement (the “Amended Agreement” or “2021 SVB Loan”, together with the 2019 SVB Loan, the “SVB Loans”) with SVB. The Amended Agreement provides for term loans in an aggregate principal amount of up to $35.5 million to be delivered in three tranches. The tranches consist of: (i) a term loan advance to the Company in an aggregate principal amount of $10.5 million on the loan closing date (the “First Tranche”); (ii) an additional term loan advance available to the Company through September 30, 2022 in an aggregate principal amount of $15.0 million; and (iii) subject to SVB’s approval, a right of the Company to request that SVB make an additional term loan advance in an aggregate principal amount of $10.0 million. The proceeds from the First Tranche were used to repay in full the existing indebtedness under the 2019 SVB Loan. The 2021 SVB Loan matures on September 1, 2026 and bears interest at an annual rate equal to the greater of (i) 0.75% plus the prime rate as reported in The Wall Street Journal and (ii) 4.00%. As of March 31, 2022, the SVB Loan bears interest at an annual rate of 4.25%. The 2021 SVB Loan has an initial interest-only period of 36 months. In addition, a final payment (the “Final Payment Fee”) equal to the original principal amount of each advance multiplied by 4.00% will be due on the maturity date. The Final Payment Fee is recorded in other noncurrent liabilities on the balance sheet. As of March 31, 2022, the SVB Loan is recorded as noncurrent.

The Amended Agreement was accounted for as a debt modification, rather than an extinguishment, based on a comparison of the present value of the cash flows under the terms of the debt immediately before and after the amendment, which resulted in a change of such cash flows of less than 10%. Unamortized debt issuance costs as of the date of modification and incremental issuance costs incurred in connection with the Amended Agreement will be amortized to interest expense using the effective interest method over the repayment term.

As of March 31, 2022 and December 31, 2021, the debt issuance costs related to the SVB Loans were $0.6 million. Debt issuance costs include the initial fair value of the SVB Warrant. The debt issuance costs are amortized to interest expense over the term of the loan using the effective interest method.

The SVB Loans and unamortized discount balances as of March 31, 2022 and December 31, 2021 are shown below (in thousands):


	March 31,			December 31,
	2022			2021
Long-term debt	$	10,500		$	10,500
Less: issuance costs		(559	)		(596	)
Total long-term debt, net of issuance costs		9,941			9,904

Future minimum payments of outstanding principal and interest under the 2021 SVB Loan are as follows:


As of March 31, 2022
2022 (nine months remaining)	$	340
2023		452
2024		2,194
2025		5,523
2026 and thereafter		3,976
Total future minimum payments		12,486
Less: interest, Final Payment fee		(1,986	)
Long-term debt		10,500
Less: issuance costs		(559	)
Long-term debt, net of issuance costs	$	9,941

The Company is subject to customary affirmative and restrictive covenants under the Amended Agreement. The Company’s obligations under the Amended Agreement are secured by a first priority security interest in substantially all of the Company’s current and future assets, other than intellectual property. The Company has agreed not to encumber its intellectual property assets, except as permitted by the Amended Agreement.

The Amended Agreement provides for events of default customary for term loan facilities of this type, including but not limited to: non-payment; breaches or defaults in the performance of covenants or representations and warranties; bankruptcy and other insolvency events of the Company; and the occurrence of a material adverse change as defined in the Amended Agreement. After the occurrence of an event of default, SVB may, among other remedies, accelerate payment of all obligations.

As of March 31, 2022 and December 31, 2021, the Company was in compliance with all covenants under the Amended Agreement and there had been no events of default.

In November 2019, simultaneously with the first draw-down under its 2019 SVB Loan, SVB entered into a warrant agreement with the Company to purchase 32,289 shares of Series B convertible preferred stock of the Company at an exercise price of $2.3228 per share (as amended, the “SVB Warrant”). In March 2020, in connection with the Company’s second draw-down under the 2019 SVB Loan, the SVB Warrant was amended to increase the number of shares of Series B convertible preferred stock of the Company by 96,867, to a total of 129,156 shares. In connection with the completion of the Company’s IPO, in accordance with the original terms the warrant instrument, the SVB Warrant was automatically adjusted into a warrant to purchase an equivalent number of shares of common stock. In June 2021, after the IPO, SVB net exercised the SVB Warrant into 117,088 shares of common stock of the Company, and the SVB Warrant is no longer outstanding as of March 31, 2022.

The fair value of the SVB Warrant liability was remeasured at each financial reporting period with any changes in fair value recognized as other income (expense) in the statements of operations. The fair value for the warrant liability for the SVB Warrant was based on the Black-Scholes option pricing valuation model using significant inputs not observable in the market and was thus classified within Level 3 of the fair value hierarchy. The change in fair value of the warrant for the three months ended March 31, 2022 and 2021 was $0 and $2.2 million, respectively, and recorded as “Change in fair value of warrant liability” in the statements of operations. When, in connection with the IPO, the SVB Warrant was automatically adjusted into a warrant to purchase an equivalent number of shares of common stock, the warrant liability was reclassified from current liabilities to equity as the warrant met the definition of an equity instrument. Additionally, at that time, the Company recorded the final valuation of the warrant liability for the SVB Warrant. The assumptions used in determining the fair value of the SVB Warrant liability are described in Note 3 to the audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021.

In February 2021, the Company sold and issued approximately $130.5 million aggregate principal of 2021 Convertible Notes in a private placement transaction. Of this amount, $48.5 million was to certain investors affiliated with members of the Company’s board of directors. The 2021 Convertible Notes accrued 6% interest per annum. The Company elected as of the issuance date to account for the 2021 Convertible Notes at fair value. Management believes that the fair value option better reflected the underlying economics of the 2021 Convertible Notes, which contained multiple embedded derivatives. Under the fair value election, changes in fair value are reported as “Change in fair value of convertible promissory notes” in the statements of operations in each reporting period after the issuance through the conversion of the 2021 Convertible Notes. The Company measured the fair value of the 2021 Convertible Notes using the probability weighted “as-converted” plus Black-Scholes option pricing model based on inputs such as the probability of IPO vs. non-IPO scenarios, fair value of the common stock price, discount yield, risk-free rate, equity volatility, expected term, number of converted shares and price negotiation adjustment for the calibration. In connection with the IPO, the 2021 Convertible Notes converted into 7,531,777 shares of the Company’s common stock. Based on the terms of the agreement, the 2021 Convertible Notes converted at a 20% discount to the public offering price in the IPO. At the time of the conversion, the Company recorded a final fair value adjustment of the 2021 Convertible Notes using the Company’s common stock price at the IPO. The assumptions used in determining the fair value of the 2021 Convertible Notes are described in Note 3 to the audited financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2021.