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Property and Equipment, Net | 12 Months Ended
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Dec. 31, 2020
Property, Plant and Equipment [Abstract] |
Property, Plant and Equipment Disclosure [Text Block] | 4. Property and Equipment, Net Property and equipment, net consists of the following (in thousands):
|  | December 31, |
|  | 2019 |  |  | 2020 |
Computer equipment |  | $ | 29,505 |  |  | $ | 33,977 |
Leasehold improvements |  |  | 421 |  |  |  | 18,176 |
Software and licenses |  |  | 2,994 |  |  |  | 3,191 |
Furniture and fixtures |  |  | 333 |  |  |  | 2,824 |
Total property and equipment |  |  | 33,253 |  |  |  | 58,168 |
Less: accumulated depreciation |  |  | (25,352 | ) |  |  | (29,581 | )
Total property and equipment, net |  | $ | 7,901 |  |  | $ | 28,587 |
Depreciation expenses were $7.6 million, $7.9 million and $14.2 million for the years ended December 31, 2018, 2019 and 2020, respectively. As of December 31, 2019 and 2020, networking equipment under finance leases with a cost basis of $20.0 million and $21.0 million, respectively, was included in computer equipment.

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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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