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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property and Equipment    
Property and equipment, gross $ 65,309 $ 27,046
Less accumulated depreciation (17,604) (15,671)
Property and equipment, net 47,705 11,375
Depreciation and amortization 4,500 4,200
Computer equipment    
Property and Equipment    
Property and equipment, gross 6,185 4,691
Computer software    
Property and Equipment    
Property and equipment, gross 1,607 1,298
Research equipment    
Property and Equipment    
Property and equipment, gross 14,568 8,445
Furniture and fixtures    
Property and Equipment    
Property and equipment, gross 5,157 4,876
Leasehold improvements    
Property and Equipment    
Property and equipment, gross 30,294 7,425
Vehicles    
Property and Equipment    
Property and equipment, gross 124 209
Land    
Property and Equipment    
Property and equipment, gross 3,190 0
Construction in progress    
Property and Equipment    
Property and equipment, gross $ 4,184 $ 102