v3.19.3.a.u2
Property and Equipment - Schedule of Property and Equipment and Classification of Depreciation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]    
Cost $ 157,659 $ 91,787
Accumulated depreciation 46,261 30,175
Net book value 111,398 61,612
Depreciation 16,779 16,905
Cost of revenues    
Property, Plant and Equipment [Line Items]    
Depreciation 1,253 5,950
Sales and marketing    
Property, Plant and Equipment [Line Items]    
Depreciation 4,929 4,087
Research and development    
Property, Plant and Equipment [Line Items]    
Depreciation 7,940 4,900
General and administrative    
Property, Plant and Equipment [Line Items]    
Depreciation 2,657 1,968
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Cost 110,477 63,402
Accumulated depreciation 24,675 16,498
Net book value 85,802 46,904
Computer equipment    
Property, Plant and Equipment [Line Items]    
Cost 18,141 14,293
Accumulated depreciation 10,989 7,540
Net book value 7,152 6,753
Fulfillment robots    
Property, Plant and Equipment [Line Items]    
Cost 3,220  
Accumulated depreciation 197  
Net book value 3,023  
Office furniture and equipment    
Property, Plant and Equipment [Line Items]    
Cost 25,821 14,092
Accumulated depreciation 10,400 6,137
Net book value $ 15,421 $ 7,955