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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property and Equipment    
Property and equipment, gross $ 58,350 $ 65,309
Less accumulated depreciation (14,487) (17,604)
Net property and equipment 43,863 47,705
Depreciation and amortization 8,400 4,500
Computer equipment    
Property and Equipment    
Property and equipment, gross 5,546 6,185
Computer software    
Property and Equipment    
Property and equipment, gross 1,207 1,607
Research equipment    
Property and Equipment    
Property and equipment, gross 15,387 14,568
Furniture and fixtures    
Property and Equipment    
Property and equipment, gross 2,880 5,157
Leasehold improvements    
Property and Equipment    
Property and equipment, gross 24,146 30,294
Vehicles    
Property and Equipment    
Property and equipment, gross 124 124
Land    
Property and Equipment    
Property and equipment, gross 3,190 3,190
Construction in progress    
Property and Equipment    
Property and equipment, gross $ 5,870 $ 4,184