Long-Term Debt (Tables)

6 Months Ended

Jun. 30, 2022

Long-Term Debt

Schedule of Long-term Debt Instruments

Debt, net of debt issuance costs and discounts, consisted of the following:

	June 30, 2022						December 31, 2021
	2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes		2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes
	(in thousands)
Liability component
Principal	$	500,000	$	115,349	$	109,808	$	500,000	$	115,349	$	113,655
Unamortized debt issuance costs		(8,930)		(1,895)		(473)		(7,132)		(2,313)		(816)
Unamortized debt discount		—		—		—		(141,303)		(30,228)		(7,430)
Net carrying amount	$	491,070	$	113,454	$	109,335	$	351,565	$	82,808		105,409
Equity component, net of issuance costs		—		—		—	$	147,458	$	62,841	$	97,072

Schedule of fair value of the convertible notes

	June 30, 2022		December 31, 2021
	(in thousands)
2026 Convertible Secured Notes	$	470,940	$	543,370
2026 Convertible Notes	$	74,030	$	69,492
2023 Convertible Notes	$	107,333	$	107,727

Schedule of initial conversion of convertible debt

	Initial conversion rate	Approximate conversion price
2026 Convertible Secured Notes	47.7612	$20.94
2026 Convertible Notes	9.2123	$108.55
2023 Convertible Notes	5.0358	$198.58

Schedule of interest expenses on convertible debt

	Three Months Ended June 30, 2022								Six Months Ended June 30, 2022
	2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes		Total		2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes		Total
	(in thousands)
Contractual interest expense	$	4,375	$	577	$	913	$	5,865	$	8,750	$	1,154	$	1,837	$	11,741
Amortization of debt issuance costs		569		116		119		804		1,132		232		237		1,601
Accretion of debt discount		—		—		—		—		—		—		—		—
Total interest expense	$	4,944	$	693	$	1,032	$	6,669	$	9,882	$	1,386	$	2,074	$	13,342
	Three Months Ended June 30, 2021								Six Months Ended June 30, 2021
	2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes		Total		2026 Convertible Secured Notes		2026 Convertible Notes		2023 Convertible Notes		Total
	(in thousands)
Contractual interest expense	$	—	$	1,150	$	3,737	$	4,887	$	—	$	2,300	$	7,475	$	9,775
Amortization of debt issuance costs		—		196		490		686		—		386		970		1,356
Accretion of debt discount		—		2,553		4,463		7,016		—		5,043		8,834		13,877
Total interest expense	$	—	$	3,899	$	8,690	$	12,589	$	—	$	7,729	$	17,279	$	25,008