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Balance Sheet Components (Tables)
 3 Months Ended
Mar. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Property, Plant and Equipment, Net
Property, plant and equipment, net consist of the following (in thousands):

March 31, 2022December 31, 2021
Land$31,243 $31,243 
Laboratory equipment14,036 13,962 
Buildings(1)
6,034 6,034 
Office and computer equipment2,225 2,239 
Leasehold improvements1,793 1,836 
Manufacturing equipment1,669 1,717 
Vehicles64 64 
Construction work-in-progress87,501 67,883 
Total property, plant and equipment, gross144,565 124,978 
Less: accumulated depreciation(3,734)(2,979)
Total property, plant and equipment, net$140,831 $121,999 
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(1) Relates to buildings acquired as described below which are being developed as part of the Company’s clinical manufacturing facility in Tarzana, California. The buildings will be placed into service and depreciation will commence once the construction is complete and they are ready for intended use.
Schedule of Accrued Expenses and Other Current Liabilities
Accrued expenses and other current liabilities consist of the following (in thousands):
 
 March 31, 2022December 31, 2021
Accrued construction costs$13,191 $11,928 
Accrued compensation and benefits6,982 12,085 
Accrued research and development expenses4,112 4,234 
Operating lease liabilities, current1,914 — 
Accrued operational expenses1,357 5,292 
Other current liabilities643 910 
Total accrued expenses and other current liabilities$28,199 $34,449