| Property and Equipment
Property and equipment, net consists of the following (in thousands): | | | | | | | | | | December 31, | | 2019 | | 2018 | Computer equipment | $ | 680,160 |
| | $ | 493,536 |
| Computer software | 59,511 |
| | 58,303 |
| Leasehold and other improvements | 125,299 |
| | 74,721 |
| Furniture and fixtures | 53,651 |
| | 42,551 |
| Building(1) | — |
| | 6,551 |
| Construction in progress(1) | 6,830 |
| | 10,167 |
| Property and equipment, gross | 925,451 |
| | 685,829 |
| Less: Accumulated depreciation | (457,366 | ) | | (338,613 | ) | Property and equipment, net | $ | 468,085 |
| | $ | 347,216 |
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| | (1) | We adopted Topic 842 using the modified retrospective method as of January 1, 2019 and derecognized $10.6 million in building and construction in progress assets that we were previously deemed to own under the prior lease accounting standards. These assets are recognized under our operating lease right-of-use assets under Topic 842 as of December 31, 2019. |
Construction in progress consists primarily of leasehold and other improvements and in-process software development costs. Depreciation expense was $167.9 million, $123.0 million and $93.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.
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