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Stock-Based Compensation - Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Stock-based compensation |  |  |
Total | $ 101,131 | $ 111,713 | $ 87,996
Non-cash stock-based compensation charged through Amount due from SINA | 8,100 | 9,300 | 7,900
Costs of revenues |  |  |
Stock-based compensation |  |  |
Total | 8,933 | 9,417 | 8,112
Sales and marketing |  |  |
Stock-based compensation |  |  |
Total | 16,528 | 18,910 | 15,292
Product development |  |  |
Stock-based compensation |  |  |
Total | 51,441 | 55,294 | 43,622
General and administrative |  |  |
Stock-based compensation |  |  |
Total | $ 24,229 | $ 28,092 | $ 20,970

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