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Property and Equipment - Schedule of Property and Equipment and Classification of Depreciation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Property, Plant and Equipment [Line Items] |  |
Cost | $ 191,718 | $ 157,659
Accumulated depreciation | 99,614 | 46,261
Net book value | 92,104 | 111,398
Depreciation | 38,192 | 16,779
Impairment charge | 16,838 |
Cost of revenues |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation | 3,160 | 1,253
Sales and marketing |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation | 9,710 | 4,929
Research and development |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation | 19,587 | 7,940
General and administrative |  |
Property, Plant and Equipment [Line Items] |  |
Depreciation | 5,735 | 2,657
Leasehold improvements |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 131,196 | 110,477
Accumulated depreciation | 65,052 | 24,675
Net book value | 66,144 | 85,802
Computer equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 24,387 | 18,141
Accumulated depreciation | 15,056 | 10,989
Net book value | 9,331 | 7,152
Fulfillment robots |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 5,419 | 3,220
Accumulated depreciation | 2,005 | 197
Net book value | 3,414 | 3,023
Office furniture and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Cost | 30,716 | 25,821
Accumulated depreciation | 17,501 | 10,400
Net book value | $ 13,215 | $ 15,421

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition The adjustment to reduce the value of existing agreements that specify the lessee's rights to use the leased property. This expense is charged when the estimates of future profits generated by the leased property are reduced. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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