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CONVERTIBLE NOTES PAYABLE (Tables)
 9 Months Ended
Sep. 30, 2022
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments
The composition of the Company’s convertible senior notes are as follows (in thousands):
 September 30, 2022 December 31, 2021
2.25% convertible senior notes due 2029
$316,250 $— 
2.50% convertible senior notes due 2025
68,904 276,000 
Unamortized debt discount— (46,045)
Unamortized debt issuance costs - 2.25% convertible senior notes due 2029
(9,099)— 
Unamortized debt issuance costs - 2.50% convertible senior notes due 2025
(938)(3,374)
Total convertible senior notes, net of unamortized debt discount and debt issuance costs$375,117 $226,581 
The following table sets forth total interest expense recognized related to the 2025 and 2029 Notes (in thousands):
Three Months Ended September 30,Nine Months Ended September 30,
2022202120222021
Contractual interest expense$2,170 $1,725 $6,223 $5,175 
Amortization of debt discount— 2,609 — 7,680 
Amortization of debt issuance costs428 226 1,194 677 
Total interest expense for the 2025 and 2029 Notes$2,598 $4,560 $7,417 $13,532