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Significant Accounting Policies - Concentration of Risks (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 USD ($) Agency customer | Dec. 31, 2022 USD ($) | Dec. 31, 2021
Significant Accounting Policies |  |  |
Cash, cash equivalents and short-term investments | $ 3,225,670 | $ 3,171,196 |
Percentage Of Cash And Cash Equivalents Held Financial Institution | 35.00% |  |
Percentage Of Short Term Investments Held Financial Institution | 25.00% |  |
Accounts receivable | $ 440,768 | 502,443 |
Current liabilities denominated in RMB | 1,797,345 | 1,219,938 |
Cash Cash Equivalents And Short Term Investments | Concentration of credit risk | China |  |  |
Significant Accounting Policies |  |  |
Cash, cash equivalents and short-term investments | 2,600,000 | 2,500,000 |
Cash Cash Equivalents And Short Term Investments | Concentration of foreign currency risks | RMB |  |  |
Significant Accounting Policies |  |  |
Cash, cash equivalents and short-term investments | $ 1,878,900 | $ 1,816,800 |
Percentage of benchmark derived from specified source | 58.00% | 57.00% |
Consolidated net revenues benchmark | Customer concentration risk |  |  |
Significant Accounting Policies |  |  |
Other customers or advertising agencies accounting for 10% or more of the Group's revenues | customer | 0 |  |
Consolidated net revenues benchmark | Customer concentration risk | Alibaba |  |  |
Significant Accounting Policies |  |  |
Percentage of benchmark derived from specified source | 6.00% | 6.00% | 6.00%
Consolidated net accounts receivables benchmark | Concentration of credit risk | Alibaba |  |  |
Significant Accounting Policies |  |  |
Percentage of benchmark derived from specified source | 14.00% | 15.00% |
Consolidated net accounts receivables benchmark | Concentration of foreign currency risks | RMB |  |  |
Significant Accounting Policies |  |  |
Accounts receivable | $ 440,800 | $ 502,400 |
Current liabilities | Concentration of foreign currency risks | RMB |  |  |
Significant Accounting Policies |  |  |
Percentage of benchmark derived from specified source | 54.00% | 80.00% |
Current liabilities denominated in RMB | $ 964,700 | $ 971,600 |
Current liabilities | Concentration of foreign currency risks | RMB | Convertible notes |  |  |
Significant Accounting Policies |  |  |
Current liabilities denominated in RMB | $ 800,000 |  |
Advertising and marketing revenues | Consolidated net revenues benchmark | Customer concentration risk | Top 10 advertising agencies | China |  |  |
Significant Accounting Policies |  |  |
Percentage of benchmark derived from specified source | 37.00% | 42.00% | 35.00%
Number of advertising agencies | Agency | 10 |  |

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