Document and Entity Information Document Information [Table] Entity Addresses, Address Type [Axis] Address Type [Domain] Business Contact [Member] Business Contact Class of Stock [Axis] Class of Stock [Domain] ADR [Member] American Depositary Shares Common Stock [Member] Ordinary shares Common Class A [Member] Class A ordinary shares Common Class B [Member] Class B ordinary shares Document Information [Line Items] Document and Entity Information Document Type Document Registration Statement Document Annual Report Document Period End Date Current Fiscal Year End Date Document Transition Report Document Shell Company Report Entity File Number Entity Registrant Name Entity Incorporation, State or Country Code Contact Personnel Name Contact Personnel Email Address Country Region City Area Code Local Phone Number Entity Address, Address Line One Entity Address, Address Line Two Entity Address, Address Line Three Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, Country Title of 12(b) Security Trading Symbol Security Exchange Name Entity Common Stock, Shares Outstanding Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Interactive Data Current Entity Filer Category Entity Emerging Growth Company ICFR Auditor Attestation Flag Document Financial Statement Error Correction [Flag] Document Accounting Standard Entity Shell Company Auditor Firm ID Auditor Name Auditor Location Entity Central Index Key Document Fiscal Year Focus Document Fiscal Period Focus Amendment Flag No Trading Symbol Flag CONSOLIDATED BALANCE SHEETS Statement [Table] Statement [Line Items] Statement Assets [Abstract] ASSETS Assets, Current [Abstract] Current assets Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents Short-Term Investments Short-term investments Short-term investments Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net of allowance of RMB 5,569 and RMB 555 (US$79) as of December 31, 2024 and 2025, respectively Accounts receivable, net Accounts receivable, net of allowance of RMB5,565 and RMB554 (US$79) as of December 31, 2024 and 2025, respectively Inventory, Net Inventories, net Other Receivables, Net, Current Amounts due from related parties (including amounts due from Group entities of RMB118,806 and RMB171,522 (US$23,498) as of December 31, 2023 and 2024, respectively) Amounts due from related parties Other Receivable, after Allowance for Credit Loss, Current, Related Party [Extensible Enumeration] Prepaid Expense and Other Assets, Current Prepayments and other current assets Total prepayments and other current assets Assets, Current Total current assets Assets, Noncurrent [Abstract] Noncurrent assets Property, Plant and Equipment, Net Property and equipment, net Property and equipment, net Finite-Lived Intangible Assets, Net Intangible assets, net Intangible assets, net Operating Lease, Right-of-Use Asset Operating lease right-of-use assets Operating lease right-of-use assets Long-Term Investments Long-term investment Other Assets, Noncurrent Other non-current assets Other noncurrent assets Assets, Noncurrent Total non-current assets Total noncurrent assets Assets Total assets Liabilities [Abstract] LIABILITIES Liabilities, Current [Abstract] Current liabilities Accounts Payable, Current Accounts payable Accounts payable (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 26,632 and RMB 24,706 (US$3,533) as of December 31, 2024 and 2025, respectively) Contract with Customer, Liability, Current Deferred revenue and customer advances Deferred revenue and customer advances (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 280,705 and RMB 218,375 (US$31,227) as of December 31, 2024 and 2025, respectively) Other Liabilities, Current Amounts due to related parties Amounts due to related parties (including amounts due to Group entities of RMB4,943 and RMB403 (US$55) as of December 31, 2023 and 2024, respectively) Amounts due to related parties (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 1,562 and RMB 935 (US$134) as of December 31, 2024 and 2025, respectively) Other Liability, Current, Related Party [Extensible Enumeration] Amount of accrued expenses and other current liabilities, due within one year or the normal operating cycle, if longer. Accrued Expenses and Other Liabilities, Current Accrued expenses and other current liabilities (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 100,213 and RMB 91,935 (US$ 13,147) as of December 31, 2024 and 2025, respectively) Total Accrued expenses and other current liabilities Dividends Payable, Current Dividends payable current Dividend payable Operating Lease, Liability, Current Current operating lease liabilities (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 3,661 and RMB 2,166 (US$310) as of December 31, 2024 and 2025, respectively) Current operating lease liabilities Liabilities, Current Total current liabilities Liabilities, Noncurrent [Abstract] Non-current liabilities Operating Lease, Liability, Noncurrent Non-current operating lease liabilities (including amounts of the consolidated VIE and VIE's subsidiaries without recourse to the primary beneficiary of RMB 11,252 and RMB 9,208 (US$1,317) as of December 31, 2024 and 2025, respectively) Noncurrent operating lease liabilities Non-current operating lease liabilities Liabilities, Noncurrent Total non-current liabilities Liabilities Total liabilities Commitments and Contingencies Commitments and contingencies Equity, Attributable to Parent [Abstract] SHAREHOLDERS' EQUITY Common Stock, Value, Issued Ordinary shares Additional Paid in Capital Additional paid-in capital Additional paidin capital Treasury Stock, Common, Value Treasury stock Statutory Accounting Practices, Statutory Capital and Surplus, Balance Statutory reserves Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive income Retained Earnings (Accumulated Deficit) Retained earnings (accumulated deficit) Equity, Attributable to Parent Balance as of ending of year Balance as of beginning of year Total shareholders' equity Liabilities and Equity Total liabilities and shareholders' equity The undesignated shares representing ownership interest in a corporation (the "undesignated"). Undesignated [Member] Undesignated Consolidated Entities [Axis] Consolidated Entities [Domain] Variable Interest Entity, Primary Beneficiary [Member] VIE Information pertaining to VIEs, excluding those in Group companies. Variable Interest Entities Excluding Group Companies [Member] VIEs excluding Group companies Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Related Party [Member] Related Party Accounts Receivable, Allowance for Credit Loss, Current Allowance for credit losses Balance at end of the year Balance at beginning of the year Allowance for credit losses Accounts receivable, allowance Common Stock, Par or Stated Value Per Share Ordinary shares, par value (in dollars per share) Common Stock, Shares Authorized Ordinary shares, shares authorized (in shares) Number of shares authorized Common Stock, Shares, Issued Ordinary shares shares issued (in shares) Common Stock, Shares, Outstanding Balance as of ending of year (in shares) Balance as of beginning of year (in shares) Ordinary shares, shares outstanding (in shares) CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME Revenues [Abstract] Revenues Revenue from Contract with Customer, Excluding Assessed Tax Revenues Revenues (including transactions with related parties of RMB 1,388, RMB 996 and RMB 932 (US$133) for the years ended December 31, 2023, 2024 and 2025, respectively) Cost of Revenue [Abstract] Cost of revenues Cost of Revenue Cost of revenues (including transactions with related parties of RMB 5,277, RMB 2,735 and RMB 937 (US$134) for the years ended December 31, 2023, 2024 and 2025, respectively) Cost of revenues Gross profit Gross profit Operating Expenses [Abstract] Operating expenses Research and Development Expense Research and development expenses (including transactions with related parties of RMB 16,264, RMB 13,718 and RMB 11,350 (US$1,625) for the years ended December 31, 2023, 2024 and 2025, respectively) Research and development expenses Selling and Marketing Expense Sales and marketing expenses (including transactions with related parties of RMB 5,370, RMB 6,021 and RMB 5,317 (US$760) for the years ended December 31, 2023, 2024 and 2025, respectively) Sales and marketing expenses General and Administrative Expense General and administrative expenses General and administrative expenses (including transactions with a related party of RMB 3,534, RMB 2,833 and RMB 1,905 (US$272) for the years ended December 31, 2023, 2024 and 2025, respectively) General and administrative expenses Operating Expenses Total operating expenses Expenses from transactions with related parties Operating Income (Loss) Operating loss Operating income Other Nonoperating Income (Expense) Other income, net Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income before income tax Income before income taxes Income before income taxes Income Tax Expense (Benefit) Income tax expenses Income tax expenses Total income tax expenses Net income Net income Other Comprehensive Income (Loss), Net of Tax [Abstract] Other comprehensive income Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Foreign currency translation adjustment Other Comprehensive Income (Loss), Net of Tax Total other comprehensive income Comprehensive Income (Loss), Net of Tax, Attributable to Parent Total comprehensive income INCOME PER SHARE Income per ordinary share: Earnings Per Share, Basic Basic Basic income per ordinary share Earnings Per Share, Diluted Diluted Diluted income per ordinary share Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average number of ordinary shares: Weighted Average Number of Shares Outstanding, Basic Weighted average number of ordinary shares outstanding - basic Basic Weighted Average Number of Shares Outstanding, Diluted Weighted average number of ordinary shares outstanding - diluted Diluted Entity Listing, Depository Receipt Ratio Number of shares per Ads CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY Equity Components [Axis] Equity Component [Domain] Treasury Stock, Common [Member] Treasury stock Additional Paid-in Capital [Member] Additional paid-in capital Retained Earnings, Appropriated [Member] Statutory reserves AOCI Attributable to Parent [Member] Accumulated other comprehensive income Retained Earnings [Member] Retained earnings/(accumulated deficit) Increase (Decrease) in Stockholders' Equity [Roll Forward] Treasury Stock, Common, Shares Balance as of ending of year, Treasury Stock (in shares) Balance as of beginning of year, Treasury Stock (in shares) APIC, Share-Based Payment Arrangement, Option, Increase for Cost Recognition Share-based compensation (Note 15) Amount appropriated from retained earnings to statutory reserves for entities incorporated in PRC. Amount Appropriated To Statutory Reserves Appropriation to statutory reserves (Note 18) Stock Repurchased During Period, Value Repurchase of ordinary shares (Note 14) Treasury Stock, Value, Acquired, Cost Method Repurchase of treasury shares (Note 14) Total cost of shares repurchased Treasury Stock, Shares, Acquired Repurchase of treasury shares (Note 14) (in shares) Stock Issued During Period, Value, Stock Options Exercised Exercise of share-based awards (Note 15) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period Number of options, Exercised Exercise of share-based awards (Note 15) (in shares) Amount of decrease in additional paid in capital (APIC) resulting from purchase of intellectual property assets from entities under common control. Adjustments to Additional Paid in Capital, Purchase Of Intellectual Property Assets From Entities Under Common Control Purchase of IP assets from entities under common control (Note 17) Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Declaration of dividends (Note 13) CONSOLIDATED STATEMENTS OF CASH FLOWS Net Cash Provided by (Used in) Operating Activities [Abstract] CASH FLOWS FROM OPERATING ACTIVITIES Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income to net cash provided by operating activities: Depreciation, Depletion and Amortization Depreciation and amortization Share-Based Payment Arrangement, Noncash Expense Sharebased compensation Accounts Receivable, Credit Loss Expense (Reversal) Allowance (reversal) of credit losses Inventory Write-down Provision (reversal) of inventory reserve The amount of non-cash operating lease expenses. Non-cash Operating Lease Expenses Non-cash operating lease expenses Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities: Increase (Decrease) in Accounts Receivable Accounts receivable Increase (Decrease) in Due from Related Parties Amounts due from related parties Increase (Decrease) in Inventories Inventories Increase (Decrease) in Prepaid Expense and Other Assets Prepayments and other current assets Increase (Decrease) in Other Noncurrent Assets Other noncurrent assets Increase (Decrease) in Accounts Payable, Trade Accounts payable Increase (Decrease) in Due to Related Parties, Current Amounts due to related parties Increase (Decrease) in Contract with Customer, Liability Deferred revenue and customer advances Increase (Decrease) in Operating Lease Liability Operating lease liabilities Increase (Decrease) in Accrued Liabilities and Other Operating Liabilities Accrued expenses and other current liabilities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Net cash provided by operating activities Net cash used in operating activities Net Cash Provided by (Used in) Investing Activities [Abstract] CASH FLOWS FROM INVESTING ACTIVITIES Payments to Acquire Productive Assets Purchases of property and equipment and intangible assets Payments to Acquire Long-Term Investments Payment for long-term investment Payments to acquire investment Payments to Acquire Short-Term Investments Placements of short-term investments Proceeds from Sale, Maturity and Collection of Short-Term Investments Proceeds from maturities of short-term investments Net Cash Provided by (Used in) Investing Activities Net cash provided by (used in) investing activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Financing Activities [Abstract] CASH FLOWS FROM FINANCING ACTIVITIES Payments for Repurchase of Common Stock Repurchase of ordinary shares Proceeds from Stock Options Exercised Proceeds received from exercise of share options Payments of Dividends Payment of shareholder dividends Amount of cash outflow for assets acquired under common control. Payment For Assets Acquired Under Common Control Payment for assets acquired under common control Net Cash Provided by (Used in) Financing Activities Net cash used in financing activities Net cash used in financing activities Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Effect of exchange rate changes on cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Net change in cash and cash equivalents Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash and cash equivalents at the end of the year Cash and cash equivalents at the beginning of the year Supplemental Cash Flow Information [Abstract] Supplemental disclosures of cash flow information: Income Taxes Paid Cash paid for income taxes