For the year ended December 31,

2023

2022

2021

(in thousands)

Cash Interest Expense

Coupon interest expense - 2023 Notes

$

23

$

545

$

3,138

Coupon interest expense - 2025 Notes

2,360

4,637

Coupon interest expense - 2027 Notes

2,385

4,688

Coupon interest expense - 2029 Notes

4,078

—

Non-cash Interest Expense

Amortization of debt discount/transaction costs- 2023 Notes

4

97

4,932

Amortization of debt discount/transaction costs- 2025 Notes

240

457

4,795

Amortization of debt discount/transaction costs- 2027 Notes

220

408

4,092

Amortization of debt discount/transaction costs- 2029 Notes

654

—

Total Interest Expense

$

9,964

$

10,832

$

26,282