Debt

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Debt

10. Debt

2021 Convertible Senior Notes

In September 2021, we issued $345.0 million aggregate principal amount of 0.25% convertible senior notes due 2026 (the “Notes”). The Notes were issued in a private offering to qualified institutional buyers pursuant to Rule 144A under the Securities Act of 1933, as amended (the “Securities Act”). The net proceeds from the sales of the Notes was approximately $335.0 million after deducting offering and issuance costs related to the Notes and before the 2021 Capped Call transactions, as described below.

The Notes are our senior, unsecured obligations and accrue interest at a rate of 0.25% per annum, payable semi-annually in arrears on April 1 and October 1 of each year, beginning on April 1, 2022. The Notes will mature on October 1, 2026, unless earlier converted, redeemed or repurchased by us. Before July 1, 2026, noteholders will have the right to convert their Notes only under the following circumstances: (1) during any calendar quarter (and only during such calendar quarter) commencing after the calendar quarter ending on December 31, 2021, if the Last Reported Sale Price (as defined in the indenture for the Notes) per share of Common Stock (as defined in the indenture for the Notes) exceeds one hundred and thirty percent (130%) of the Conversion Price (as defined in the indenture for the Notes) for each of at least twenty (20) Trading Days (as defined in the indenture for the notes) (whether or not consecutive) during the thirty (30) consecutive Trading Days ending on, and including, the last Trading Day of the immediately preceding calendar quarter; (2) during the five (5) consecutive Business Days (as defined in the indenture for the Notes) immediately after any ten (10) consecutive Trading Day period (such ten (10) consecutive Trading Day period, the “Measurement Period”) if the Trading Price per $1,000 principal amount of Notes for each Trading Day of the Measurement Period was less than ninety eight percent (98%) of the product of the Last Reported Sale Price per share of Common Stock on such Trading Day and the Conversion Rate (as defined in the indenture for the Notes) on such Trading Day; (3) if we call any or all of the Notes for redemption, such Notes called for redemption may be converted any time prior to the close of business on the second business day immediately before the redemption date; or (4) upon the occurrence of specified corporate

events. From and after July 1, 2026, noteholders may convert their Notes at any time at their election until the close of business on the second scheduled trading day immediately before the maturity date.

We will settle conversions by paying or delivering, as applicable, cash, shares of our common stock or a combination of cash and shares of our common stock, at our election. The initial conversion rate for the Notes is 13.6783 shares of common stock per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $73.11 per share of common stock. The conversion rate and conversion price will be subject to adjustment upon the occurrence of certain events, such as distribution of stock dividends or stock splits.

We may not redeem the Notes prior to October 7, 2024. The Notes will be redeemable, in whole or in part (subject to certain limitations), for cash at our option at any time, and from time to time, on or after October 7, 2024 and on or before the 25th scheduled trading day immediately before the maturity date, but only if the last reported sale price per share of our common stock exceeds 130% of the conversion price on (i) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date we send the related redemption notice; and (ii) the trading day immediately before the date we send such notice. The redemption price will be a cash amount equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, up to, but excluding, the redemption date. Pursuant to the Partial Redemption Limitation (as defined in the indenture for the Notes), we may not elect to redeem less than all of the outstanding Notes unless at least $150.0 million aggregate principal amount of Notes are outstanding and not subject to redemption as of the time we send the related redemption notice.

If a “fundamental change” (as defined in the indenture for the Notes) occurs, then, subject to a limited exception, noteholders may require us to repurchase their Notes for cash. The repurchase price will be equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, up to, but excluding, the applicable repurchase date.

In accounting for the issuance of the Notes, we recorded the Notes as a liability at face value. The effective interest rate for the Notes was 0.84%. Transaction costs of $10.0 million, attributable to the issuance of the Notes were recorded as a direct deduction from the related debt liability in the Consolidated Balance Sheet and are amortized to interest expense over the term of the Notes.

2021 Capped Call Transactions

In connection with the pricing of the 2021 Notes, we entered into privately negotiated capped call transactions (the “Capped Call Transactions”) with certain financial institutions.

We used $35.6 million of the net proceeds from the Notes to enter into privately negotiated capped call instruments the (“Capped Call Transactions”) with certain financial institutions. The Capped Call Transactions are generally expected to reduce potential dilution to holders of our common stock upon any conversion of the Notes and/or offset any cash payments we are required to make in excess of the principal amount of the Notes upon conversion of the Notes in the event that the market price per share of our common stock is greater than the strike price of the Capped Call Transactions with such reduction and/or offset subject to a cap The Capped Call Transactions have an initial cap price of approximately $106.34 per share, which represents a premium of 100% over the last reported sale prices of our common stock of $53.17 per share on September 9, 2021, and is subject to certain adjustments under the terms of the Capped Call Transactions. Collectively, the Capped Call Transactions cover, initially, the number of shares of our common stock underlying the Notes, subject to anti-dilution adjustments substantially similar to those applicable to the Notes.

The Capped Call Transactions do not meet the criteria for separate accounting as a derivative as they are indexed to our stock. The premiums paid for the Capped Call Transaction have been included as a net reduction to additional paid-in capital within stockholders’ equity.

The net carrying amount of the Notes consists of the following:

(in thousands)	December 31, 2021			December 31, 2020
Principal balance	$	345,000		$	—
Unamortized issuance costs	$	(9,463	)	$	—
Carrying value, net	$	335,537		$	—

The total interest expense recognized related to the Notes consists of the following:

	December 31,
(in thousands)	2021		2020		2019
Contractual interest expense	$	254	$	—	$	0
Amortization of issuance costs		574		—		—
Total	$	828	$	—	$	—

Convertible Term Loans

Prior to our IPO, we entered into two contingent convertible debt agreements (the “Convertible Term Loans”) with Silicon Valley Bank (“SVB) providing for two term loans with a combined borrowing of $55.0 million. In conjunction with our IPO on August 5, 2020, the bank exercised its purchase right and repaid $1.1 million of previously paid principal. This balance, combined with the unpaid principal of $53.9 million was converted into 5,249,534 shares of Series 1 common stock. No further borrowings are allowed under these convertible debt agreements. The weighted -average interest rate was 5.8% during the year ended December 31, 2020.

In addition to the conversion shares on the outstanding principal, one of the convertible debt agreements, in the amount of $35.0 million, required a deficiency payment if the value of the conversion shares did not meet an applicable required minimum return. The deficiency payment, at

the election of the holder, would be settled either (i) by issuance of additional shares of common stock equal to the difference between the minimum return and the conversion value or (ii) in cash in a single installment in the amount of such difference. Our management determined that the required minimum return as defined above represented, in substance, an embedded lenders’ put option designed to provide the investor with a fixed monetary amount, settleable in either additional shares or cash. Management determined that this put option should be separated and accounted for as a derivative primarily because the put option met the net settlement criterion and the settlement provisions were not consistent with a fixed-for-fixed equity instrument. Based on the value of the conversion shares issued to the bank upon completion of the IPO, we met the required minimum return under terms of the Convertible Term Loan and were not required to provide any additional shares or cash.

The put option, with an initial fair value of approximately $4.4 million, was recorded as a derivative liability on the accompanying balance sheet and a corresponding discount to the Convertible Term Loan. The discount was accreted to interest expense in the consolidated statements of operations over the term of the Convertible Term Loan using the effective interest method. The net balance outstanding under the terms of this agreement was netted against the outstanding principal balance upon conversion to Series 1 Common Stock upon completion of our IPO. We recorded interest expense related to this instrument of $0.4 million during the year ended December 31, 2020.

The estimated fair value of the put option was determined using a multi-scenario probability weighted expected return method analysis in which the future probability of exit events was weighted for its respective probability. Key assumptions included time to exit event, fair value of common stock, and a discount rate. At March 31, 2020, we determined the put option had no fair value due to an increase in market conditions that would make any amounts due under the redemption feature remote. As a result, we recorded a gain in the amount of $4.4 million, which was recorded in the accompanying consolidated statements of operations. This instrument was extinguished upon the conversion of the 2020 Convertible Term Debt and completion of our IPO.

Credit Facility

In 2020, we had an available credit facility with SVB that provided for a $20.0 million line of credit and a $5.0 million term loan. The outstanding balance under this credit facility was repaid in 2020. We had no outstanding balances as of December 31, 2020 and no further borrowings are allowed under the credit facility. The weighted average interest rate for these borrowings was 4.0 percent for year ended December 31, 2020.

Mezzanine Facility Loan

On October 27, 2017, we amended and restated our loan and security agreement (as amended, the “Credit Facility”) with SVB. The Credit Facility provided a $20.0 million revolving line of credit (the “Revolving Line”) and a $5.0 million term loan (the “2018 Term Loan”). On June 4, 2019, we amended the Credit Facility to increase the Revolving Line by $5.0 million to $25.0 million. On February 28, 2020, we entered into a mezzanine loan and security agreement (the “Mezzanine Facility”) with WestRiver Innovation Lending Fund VIII, L.P. (“WestRiver”) providing for a term loan of $10.0 million. We did not draw upon the funds available under this facility and formally terminated this facility on November 6, 2020.

In connection with the Mezzanine Facility, we issued warrants to purchase up to 99,000 shares of common stock with an exercise price of $9.21 per share with the warrants expiring on March 1, 2023. The warrant was exercisable for half of the shares. The warrant did not become exercisable for the remaining half of the shares because we did not draw upon the Mezzanine Facility and our ability to draw upon under the Mezzanine Facility terminated. Warrants to purchase 49,500 shares of common stock that were exercisable, were exercised in August 2020 and the remaining portion that did not become exercisable terminated upon the termination of the Mezzanine Facility.

We recorded the fair value of the warrants issued in connection with the Mezzanine Facility as a discount on the carrying value of the debt instruments. This discount of $0.3 million was amortized to interest expense over the life of the debt instruments as an adjustment to the effective interest rate.

 Debt fees

Lender fees that were paid upfront to the lenders and debt issuance fees paid to third parties are recorded as a discount to the carrying amount of debt and are being amortized to interest expense over the life of the debt. Interest expense related to debt discount amortization was not material for any of the periods presented. Net unamortized debt issuance fees as of December 31, 2021 amounted to $9.5 million.