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CONVERTIBLE NOTES (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-Term Debt As of December 31, 2023 and 2022, the convertible note obligations were classified as follows in the consolidated balance sheets (in thousands):
20232022
2.50% Notes$726 $56,413 
  5.00% Notes$36,102 $— 
Total convertible notes$36,828 $56,413 
Current portion of convertible notes$726 $56,413 
Convertible notes, non-current$36,102 $— 
Schedule of Interest Expense
Interest expense related to the Company’s convertible note obligations consisted of the following for the years ended December 31 (in thousands):

202320222021
Contractual coupon interest$2,425 $1,794 $3,934 
Amortization of premium, discount and issuance costs, net
3,278 474 11,542 
Total interest expense on convertible notes$5,703 $2,268 $15,476 
Schedule of Gain (Loss) on Extinguishment
Gain (loss) on extinguishment of exchanged convertible notes were as follows for the years ended December 31 (in thousands):

202320222021
(Loss) gain on extinguishment$(6,499)$3,565 $4,916 
Schedule of Convertible Notes
The carrying value of the 2.50% Notes was included in current portion of convertible notes and consisted of the following at December 31 (in thousands):

20232022
Outstanding principal$726 $56,595 
Unamortized debt issuance— (182)
Net carrying amount$726 $56,413 
The carrying value of the 5.00% Notes consisted of the following at December 31 (in thousands):

20232022
Outstanding principal at par$67,634 $— 
Unamortized debt premium5,408 — 
Unamortized debt discount(34,267)— 
Unamortized debt issuance costs(2,673)— 
Net carrying amount$36,102 $— 
Schedule of Derivative Financial Instrument Activity The derivative financial instrument activity for the year ended December 31, 2023 is comprised of the following (in thousands):
2023
Beginning balance$— 
Initial measurement38,160 
Reduction as a result of conversion of 5.00% Notes(380)
Change in value - gain(10,872)
Reclassification to contributed capital(26,908)
Ending balance$— 
Schedule of Significant Assumptions and Inputs Used to Estimate the Fair Value of Convertible Notes and Conversion Option The table below summarizes the significant inputs used to estimate the fair value of the 5.00% Notes as of December 31, 2023 and the June 9, 2023 issuance date:
December 31,June 09,
20232023
Coupon rate5.00%5.00%
Term (years)3.03.5
Volatility55.00%55.00%
Risk-free rate4.02 %4.15 %
Discount yield25.00 %25.00 %
Discount factor50.00%44.00%
The table below summarizes the significant inputs used to estimate the fair value of the Conversion Option as of October 17, 2023 and June 9, 2023:

October 17June 09,
20232023
Stock price$5.94$7.40
Initial conversion price$7.20$7.20
Conversion cap$8.30$8.30
Term (years)3.23.5
Time to call (years)1.72.0
Volatility55.00 %55.00 %
Risk-free rate5.00 %4.15 %
Discount yield25.00 %25.00 %
The table below summarizes the significant inputs used to estimate the fair value of the Schuler Purchase Obligation as of December 31, 2023 and June 9, 2023:
December 31,June 9,
20232023
Stock price$3.92$7.40
Exercise price$7.20$7.20
Term (years)0.130.52
Volatility55.00 %55.00 %
Risk-free rate5.55 %5.38 %
Fixed commitment purchase price (in thousands)$10,000$10,000
Number of Shares1,387,9491,387,949
Obligation probability75%100%