Debt - Outstanding Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt
Principal	$ 550,484	$ 558,728
Unaccreted Discount	(107,084)	(115,366)
Debt Issuance Costs	(6,615)	(7,623)
Carrying Value	436,785	435,739
Convertible senior notes, due 2026
Debt
Principal	217,000	225,000
Unaccreted Discount	0	0
Debt Issuance Costs	(2,612)	(3,311)
Carrying Value	214,388	221,689
Convertible senior notes, due 2028
Debt
Principal	333,334	333,334
Unaccreted Discount	(107,078)	(115,353)
Debt Issuance Costs	(4,003)	(4,312)
Carrying Value	222,253	213,669
Advance funding arrangement
Debt
Principal		94
Unaccreted Discount		0
Debt Issuance Costs		0
Carrying Value		94
Other notes
Debt
Principal	150	300
Unaccreted Discount	(6)	(13)
Debt Issuance Costs	0	0
Carrying Value	$ 144	$ 287