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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Stock-based compensation expense | $ 15,100 | $ 15,900 | $ 29,700 | $ 30,600
Depreciation expense |  |  | 13,578 | 11,274
Cost of revenue |  |  |  |
Stock-based compensation expense | 1,386 | 2,199 | 3,281 | 3,448
Depreciation expense | 2,634 | 2,537 | 5,168 | 4,909
Amortization of purchased intangibles | 1,184 | 284 | 2,359 | 569
Sales and marketing |  |  |  |
Stock-based compensation expense | 3,373 | 2,525 | 7,155 | 7,664
Depreciation expense | 615 | 620 | 1,218 | 1,287
General and administrative |  |  |  |
Stock-based compensation expense | 3,110 | 4,083 | 5,760 | 6,811
Depreciation expense | 28 | 49 | 88 | 154
Product development |  |  |  |
Stock-based compensation expense | 7,218 | 7,138 | 13,502 | 12,719
Depreciation expense | $ 3,696 | $ 2,532 | $ 7,104 | $ 4,924

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