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Property, Plant and Equipment | 9 Months Ended
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Sep. 30, 2021
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment | 7. Property, Plant and Equipment Property, plant and equipment, net consisted of the following:
| As of December 31, |  | As of September 30,
| 2020 |  | 2021
Furniture and fixtures | $ | 2,341 |  |  | $ | 2,179 |
Computer and office equipment | 4,077 |  |  | 4,885 |
Telecommunications equipment | 60,651 |  |  | 68,596 |
Leasehold improvements | 6,285 |  |  | 6,260 |
Software | 3,901 |  |  | 4,994 |
Internal-use software development | 19,968 |  |  | 22,930 |
Automobile | 502 |  |  | 605 |
Land | — |  |  | 16,394 |
Total cost | 97,725 |  |  | 126,843 |
Less—accumulated depreciation | (46,080) |  |  | (58,576) |
Total property, plant and equipment, net | $ | 51,645 |  |  | $ | 68,267 |
The Company capitalized $348 and $1,846 of software development costs for the three and nine months ended September 30, 2020, respectively, and $808 and $3,212 for the three and nine months ended September 30, 2021, respectively. Amortization expense related to capitalized software development costs were $377 and $1,547 for the three and nine months ended September 30, 2020, respectively, and $459 and $1,404 for the three and nine months ended September 30, 2021, respectively. As of September 30, 2021, unamortized implementation costs related to cloud computing arrangements are $464, of which $140 are included in prepaid expenses and other current assets and $324 are included in other long-term assets. The Company leases automobiles under leases accounted for as finance leases with expiration dates ranging from December 31, 2021 to June 30, 2025. As of September 30, 2021, cost and accumulated depreciation of the assets under finance leases recorded by the Company were $595 and $187, respectively. The Company recognized depreciation expense, which includes amortization of capitalized software development costs, as follows:
| Three months ended September 30, |  |  |  | Nine months ended September 30,
| 2020 |  | 2021 |  |  |  | 2020 |  | 2021
Cost of revenue | $ | 2,284 |  |  | $ | 2,976 |  |  |  |  | $ | 6,958 |  |  | $ | 8,947 |
Research and development | 197 |  |  | 296 |  |  |  |  | 441 |  |  | 829 |
Sales and marketing | 30 |  |  | 32 |  |  |  |  | 90 |  |  | 90 |
General and administrative | 646 |  |  | 1,165 |  |  |  |  | 2,048 |  |  | 3,117 |
Total depreciation expense | $ | 3,157 |  |  | $ | 4,469 |  |  |  |  | $ | 9,537 |  |  | $ | 12,983 |

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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