Principal Accounting Policies - Segment Reporting (Details) $ in Thousands |
12 Months Ended | ||
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Dec. 31, 2025
USD ($)
segment
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Dec. 31, 2024
USD ($)
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Dec. 31, 2023
USD ($)
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| Segment Reporting Information [Line Items] | |||
| Number of operating segments | segment | 1 | ||
| Number of reportable segments | segment | 1 | ||
| Revenue | $ 321,791 | $ 298,617 | $ 229,990 |
| Cost of revenue | (166,750) | (157,187) | (123,335) |
| Gross profit | 155,041 | 141,430 | 106,655 |
| Research and development expenses | (89,687) | (95,049) | (102,277) |
| Other operating incomes, net | 10,151 | 11,334 | 10,901 |
| (Loss)/profit from operations | 11,479 | (47,620) | (105,824) |
| Single reporting segment | |||
| Segment Reporting Information [Line Items] | |||
| Revenue | 321,791 | 298,617 | 229,990 |
| Cost of revenue | (166,750) | (157,187) | (123,335) |
| Gross profit | 155,041 | 141,430 | 106,655 |
| Research and development expenses | (89,687) | (95,049) | (102,277) |
| Selling, general and administrative expenses | (64,026) | (105,335) | (121,103) |
| Other operating incomes, net | 10,151 | 11,334 | 10,901 |
| (Loss)/profit from operations | $ 11,479 | $ (47,620) | $ (105,824) |
| X | ||||||||||
- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net result for the period of deducting operating expenses from operating revenues. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. No definition available.
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- Definition Amount of expense for research and development. Includes, but is not limited to, cost for computer software product to be sold, leased, or otherwise marketed and writeoff of research and development assets acquired in transaction other than business combination or joint venture formation or both. Excludes write-down of intangible asset acquired in business combination or from joint venture formation or both, used in research and development activity. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Details
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