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FINANCING ARRANGEMENTS
 6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
FINANCING ARRANGEMENTS FINANCING ARRANGEMENTS
Convertible Senior Notes due 2026
The convertible senior notes due 2026 (the "2026 Notes") bear interest at a rate of 1.125% per annum, payable semiannually in arrears on March 15 and September 15 of each year, with an annual effective interest rate of 1.83%. The 2026 Notes will mature on March 15, 2026, subject to earlier repurchase, redemption or conversion.
The carrying amount of the 2026 Notes consisted of the following as of June 30, 2023 and December 31, 2022 (in thousands):
June 30, 2023December 31, 2022
Principal amount$230,000 $230,000 
Less: debt discount(4,307)(5,077)
Net carrying amount of liability$225,693 $224,923 
We classified the fair value of the 2026 Notes as a Level 3 measurement due to the lack of observable market data over fair value inputs such as our stock price volatility over the term of the 2026 Notes and our cost of debt. The estimated fair value of the 2026 Notes as of June 30, 2023 and December 31, 2022 was $86.7 million and $133.1 million and was determined using a lattice model.
During the three and six months ended June 30, 2023 and 2022, we recognized interest costs on the 2026 Notes as follows (in thousands):
Three Months Ended June 30, Six Months Ended June 30,
2023202220232022
Contractual interest$647 $647 $1,294 $1,294 
Amortization of debt discount386 379 770 757 
Total $1,033 $1,026 $2,064 $2,051 
Capped Call Transactions
In connection with the 2026 Notes, we entered into privately-negotiated capped call transactions. The capped call transactions cover, subject to customary adjustments, the number of shares of common stock initially underlying the 2026 Notes. The capped call transactions are expected generally to reduce potential dilution to our common stock upon any conversion of the 2026 Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted notes, with such reduction and/or offset subject to a cap initially equal to $104.80 (which represents a premium of 100% over the last reported sale price of our common stock on The Nasdaq Global Select Market on March 22, 2021), subject to certain adjustments under the terms of the capped call transactions.
Revolving Credit Agreement
In May 2019, we entered into a second amended and restated senior secured revolving credit agreement, which matures on May 14, 2024, as amended from time to time (the "Amended Credit Agreement"). Most recently, in March 2023, we entered into a fourth amendment to the revolving credit agreement (the "Fourth Amendment" and together with the Amended Credit Agreement the "Existing Credit Agreement") to modify certain financial covenants and provide for additional flexibility in our operations, among other changes, including certain modifications to (i) our requirements to maintain a monthly minimum liquidity balance (including any undrawn amounts under the revolving credit facility) of at least $50.0 million, (ii) the calculation of EBITDA under the Existing Credit Agreement, (iii) mandatory prepayment requirements and (iv) certain affirmative covenants. In addition, the Fourth Amendment reduced our borrowing capacity under our senior secured revolving credit facility from $150.0 million to $75.0 million, which provides for the issuance of up to $75.0 million in letters of credit, provided that the sum of outstanding borrowings and letters of credit do not exceed the maximum funding commitment of $75.0 million.
We deferred debt issuance costs of $4.6 million in aggregate in connection with the Existing Credit Agreement. Deferred debt issuance costs are included within Other non-current assets on the Condensed Consolidated Balance Sheet as of June 30, 2023 and are amortized to interest expense over the term of the respective agreement.
As of June 30, 2023, we were in compliance with the covenants under our Existing Credit Agreement. Non-compliance with the covenants under the Existing Credit Agreement may result in termination of the commitments thereunder and then any outstanding borrowings may be declared due and payable immediately. We have the right to terminate the Existing Credit Agreement or reduce the available commitments at any time.
Amounts committed to outstanding borrowings and letters of credit under our Existing Credit Agreement as of June 30, 2023 and our Amended Credit Agreement as of December 31, 2022 were as follows (in thousands):
June 30, 2023December 31, 2022
Borrowings$46,700 $75,000 
Letters of credit24,545 24,900