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Concentration and Risks | 12 Months Ended
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Dec. 31, 2025
Concentration and Risks [Abstract] |
Concentration and Risks | # 3. Concentration and Risks Financial instruments that potentially expose the Group to significant concentration of credit risk primarily consist of cash and cash equivalents, restricted cash, short-term investments and accounts receivable. As of December 31, 2024 and 2025, substantially all of the Group’s cash and cash equivalents, restricted cash and short-term investments were held in major financial institutions located in Mainland China and Hong Kong, which management considered being of high credit quality. Accounts receivable are typically unsecured and are derived from revenues earned from reputable customers. There was one customer with a receivable balance exceeding 10% of the total accounts receivable balance as of December 31, 2024 and 2025, respectively as follows. The risk with respect to accounts receivable is mitigated by credit evaluations the Group performs on its customers and its ongoing monitoring process of outstanding balances.
|  | As of December 31, |
|  | 2024 |  |  | 2025 |
Customer A |  |  | 16 | % |  |  | 20 | %
No single customer represented greater than 10% of the total net revenues for the year ended December 31, 2024. There was one customer which individually represented greater than 10% of the total net revenues for the years ended December 31, 2023 and 2025, respectively as follows:
|  | For the year ended December 31, |
|  | 2023 |  |  | 2024 |  | 2025 |
Customer B |  |  | 11 | % |  | * |  | * |
Customer C |  | * |  |  | * |  |  | 16 | %
There was one instructor, through whom the Group’s net learning services revenue earned was more than 10% of the Group’s net learning services revenue for the years ended December 31, 2023, 2024 and 2025, respectively.
|  | For the year ended December 31, |
|  | 2023 |  |  | 2024 |  |  | 2025 |
Instructor A |  |  | 17 | % |  |  | 14 | % |  | * |
Instructor B |  | * |  |  | * |  |  |  | 15 | %
* The percentage was below 10% for the year.

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- Definition The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 21 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-21 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 3A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482836/275-10-55-3A Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-2A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-1 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/275/tableOfContent + Details
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