December 31,
2023

December 31,
2022

(Amounts in thousands)

0.375% Convertible Senior Notes due 2024:

Principal amount

$

69,700

$

287,470

Unamortized debt issuance costs

(248

)

(2,855

)

Carrying amount - Convertible Senior Notes due 2024, net

$

69,452

$

284,615

1.00% Convertible Senior Notes due 2028:

Principal amount

$

600,000

$

—

Unamortized debt discount

(81,457

)

—

Unamortized debt issuance costs

(8,400

)

—

Carrying amount - Convertible Senior Notes due 2028, net

$

510,143

$

—