Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 134,571	$ 120,971
Tax credit carryforwards	29,311	22,597
Capitalized start-up costs		121
Capitalized research and development expenses, net - Sec. 59(e):	1,814	3,570
Capitalized research and development expenses, net Sec. 174	38,244	19,491
Operating lease liabilities	1,693	1,970
Derivative liability	3,082	6,981
Stock-based Awards	9,976	10,443
Accrued expenses and other	10,186	8,433
Total deferred tax assets	228,877	194,577
Valuation allowance	(225,248)	(183,737)	$ (164,546)	$ (142,637)
Net deferred tax assets	3,629	10,840
Operating lease right of use assets	(1,383)	(1,507)
Convertible Notes		(6,603)
Barings Credit Facility	(2,246)	(2,730)
Total deferred tax liabilities	$ (3,629)	(10,840)
Net deferred tax assets