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Property and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Property and equipment |  |  |
Property and equipment, gross | $ 51,068 | $ 38,713 |
Less accumulated depreciation and amortization | (22,828) | (17,031) |
Property and equipment, net | 28,240 | 21,682 |
Depreciation and amortization expense | 6,300 | 4,700 | $ 3,400
Computers, software and equipment |  |  |
Property and equipment |  |  |
Property and equipment, gross | 41,955 | 31,229 |
Furniture and fixtures |  |  |
Property and equipment |  |  |
Property and equipment, gross | 539 | 527 |
Leasehold and tenant improvements |  |  |
Property and equipment |  |  |
Property and equipment, gross | $ 8,574 | $ 6,957 |

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