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Financial Statement Details (Tables)
12 Months Ended
Dec. 31, 2023
Financial Statement Details [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consist of the following (in thousands):
As of December 31,
20232022
Prepaid research and development costs$7,847 $11,704 
Prepaid services5,869 8,013 
Prepaid insurance2,242 2,282 
Prepaid software license fees2,100 2,195 
Insurance premium financing asset1,475 1,417 
Insurance claims receivable1,149 — 
Prepaid equipment maintenance1,183 833 
ERP system implementation cost1,087 920 
Prepaid supplies— 2,160 
Other2,651 1,979 
Prepaid expenses and other current assets$25,603 $31,503 
Schedule of Property, Plant and Equipment, Net Depreciation of property, plant and equipment is calculated using the straight-line method over the estimated useful lives of the assets, as follows:
Buildings
39 years
Software
3 years
Laboratory equipment
5 to 7 years
Furniture & fixtures
5 years
IT equipment
3 years
Leasehold improvementsThe lesser of the lease term or life of the asset
Property, plant and equipment, net, consist of the following (in thousands):
As of December 31,
20232022
Leasehold improvements$72,552 $68,710 
Equipment69,915 67,945 
Construction in progress84,436 72,693 
Software1,666 1,657 
Furniture & fixtures1,889 1,906 
Gross property, plant and equipment230,458 212,911 
Less: Accumulated depreciation and amortization84,376 69,252 
Property, plant and equipment, net$146,082 $143,659 
Schedule of Intangible Assets, Net
The gross carrying amounts and accumulated amortization of intangible assets are as follows at the dates indicated (in thousands):
 December 31, 2023
Weighted-
Average
Life
(in years)
Gross Carrying
Amount
Accumulated
Amortization
ImpairmentNet Carrying
Amount
Definite-lived: Favorable leasehold rights8.1$20,398 $(3,825)$— $16,573 
Indefinite-lived: IPR&D1,406 — (886)520 
Total intangible assets$21,804 $(3,825)$(886)$17,093 
 December 31, 2022
Weighted-
Average
Life
(in years)
Gross Carrying
Amount
Accumulated
Amortization
ImpairmentNet Carrying
Amount
Favorable leasehold rights9.1$20,398 $(1,785)$— $18,613 
Organized workforce831 (150)(681)— 
Total definite-lived intangible assets21,229 (1,935)(681)18,613 
Indefinite-lived: IPR&D1,390 — — 1,390 
Total intangible assets$22,619 $(1,935)$(681)$20,003 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
Future amortization expense associated with our definite-lived intangible assets is as follows (in thousands):
Years ending December 31:
Definite-lived
Intangible
Assets
2024$2,040 
20252,040 
20262,040 
20272,040 
20282,040 
Thereafter6,373 
Total$16,573 
Schedule of Accrued Expenses and Other Liabilities
Accrued expenses and other liabilities consist of the following (in thousands):
As of December 31,
20232022
Accrued bonus$11,350 $12,068 
Accrued professional and service fees9,829 6,685 
Accrued research and development costs7,700 1,930 
Accrued compensation6,241 6,040 
Accrued preclinical and clinical trial costs4,218 4,985 
Financing obligation – current portion1,475 1,417 
Accrued construction costs1,179 7,072 
Other716 1,628 
Accrued expenses and other liabilities$42,708 $41,825 
Schedule of Interest and Investment (Loss) Income, Net
Interest and investment income (loss), net consists of the following (in thousands):
Year Ended December 31,
202320222021
Unrealized losses from equity securities$(1,591)$(4,190)$(4,615)
Interest income863 2,708 836 
Investment accretion income (amortization expense), net1,844 (1,486)(488)
Net realized gains (losses) on investments15 (122)167 
Interest and investment income (loss), net$1,131 $(3,090)$(4,100)
Schedule of Interest Expense
Interest expense consists of the following (in thousands):
Year Ended December 31,
202320222021
Interest expense on related-party notes payable$86,453 $47,145 $14,695 
Amortization of related-party notes discounts42,396 16,282 62 
Other interest expense349 88 92 
Interest expense$129,198 $63,515 $14,849