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Balance Sheet Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Accrued construction costs $ 13,191 $ 11,928
Accrued compensation and benefits 6,982 12,085
Accrued research and development expenses 4,112 4,234
Operating lease liabilities, current 1,914  
Accrued operational expenses 1,357 5,292
Other current liabilities 643 910
Total accrued expenses and other current liabilities $ 28,199 $ 34,449
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Total accrued expenses and other current liabilities