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Condensed Financial Information of the Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2024
Condensed Balance Sheet Statements, Captions [Line Items] |
Condensed Balance Sheet [Table Text Block] | The following table sets forth the assets and liabilities of the VIE and subsidiaries of the VIE included in the Group’s consolidated balance sheets:
|  | As of December 31, |
|  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | US$ |
Cash and cash equivalents |  |  | 314,724 |  |  |  | 150,947 |  |  |  | 20,680 |
Restricted cash |  |  | 20 |  |  |  | 20 |  |  |  | 3 |
Accounts receivable (net of allowance of RMB38,123 and RMB45,590 (US$6,246) as of December 31, 2023 and 2024, respectively) |  |  | 126,851 |  |  |  | 151,971 |  |  |  | 20,821 |
Contract assets (net of allowance of RMB58,790 and RMB61,856 (US$8,474) as of December 31, 2023 and 2024, respectively) |  |  | 22,748 |  |  |  | 13,855 |  |  |  | 1,898 |
Inter-company receivables* |  |  | 343,342 |  |  |  | 605,656 |  |  |  | 82,975 |
Inventories |  |  | 61,169 |  |  |  | 53,618 |  |  |  | 7,345 |
Prepayments and other current assets |  |  | 16,855 |  |  |  | 13,737 |  |  |  | 1,882 |
Total current assets |  |  | 885,709 |  |  |  | 989,804 |  |  |  | 135,604 |
Property and equipment, net |  |  | 45,533 |  |  |  | 19,656 |  |  |  | 2,692 |
Intangible assets, net |  |  | 38 |  |  |  | 224 |  |  |  | 30 |
Other non-current assets |  |  | 2,398 |  |  |  | 5,353 |  |  |  | 733 |
Operating right-of-use assets |  |  | 4,524 |  |  |  | 41,985 |  |  |  | 5,752 |
Total non-current assets |  |  | 52,493 |  |  |  | 67,218 |  |  |  | 9,207 |
TOTAL ASSETS |  |  | 938,202 |  |  |  | 1,057,022 |  |  |  | 144,811 |
Accounts payable |  |  | 11,209 |  |  |  | 30,408 |  |  |  | 4,166 |
Deferred revenue |  |  | 127,631 |  |  |  | 110,652 |  |  |  | 15,159 |
Inter-company payables* |  |  | 1,693,577 |  |  |  | 1,768,322 |  |  |  | 242,259 |
Accrued liabilities and other current liabilities |  |  | 71,144 |  |  |  | 61,212 |  |  |  | 8,386 |
Customer deposits |  |  | 1,197 |  |  |  | 592 |  |  |  | 81 |
Current portion of operating lease liabilities |  |  | 3,639 |  |  |  | 13,832 |  |  |  | 1,895 |
Total current liabilities |  |  | 1,908,397 |  |  |  | 1,985,018 |  |  |  | 271,946 |
Other non-current liabilities |  |  | 4,288 |  |  |  | 10,171 |  |  |  | 1,395 |
Non-current portion of operating lease liabilities |  |  | — |  |  |  | 26,669 |  |  |  | 3,654 |
Total non-current liabilities |  |  | 4,288 |  |  |  | 36,840 |  |  |  | 5,049 |
TOTAL LIABILITIES |  |  | 1,912,685 |  |  |  | 2,021,858 |  |  |  | 276,995 |
* | Inter-company receivables/payables represent balances of VIE and subsidiaries of the VIE due from/to the Company and the Group’s consolidated subsidiaries.
Condensed Cash Flow Statement [Table Text Block] | The table sets forth the cash flows of the VIE and subsidiaries of the VIE included in the Group’s consolidated statements of cash flows:
|  | For the years ended December 31, |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Net cash used in operating activities |  |  | (139,381 | ) |  |  | (2,768 | ) |  |  | (160,551 | ) |  |  | (21,994 | )
Net cash used in investing activities |  |  | (37,088 | ) |  |  | (606 | ) |  |  | (3,226 | ) |  |  | (442 | )
Net cash generated from (used in) financing activities |  |  | 377,630 |  |  |  | (68,894 | ) |  |  | — |  |  |  | — |
Parent Company [Member] |
Condensed Balance Sheet Statements, Captions [Line Items] |
Condensed Balance Sheet [Table Text Block] | Condensed Balance Sheets
|  | As of December 31, |
|  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | US$ |
ASSETS |  |  |  |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  |  | 14,171 |  |  |  | 9,328 |  |  |  | 1,278 |
Restricted cash |  |  | 62 |  |  |  | 224 |  |  |  | 31 |
Inter-company receivables |  |  | 3,152,747 |  |  |  | 3,198,215 |  |  |  | 438,152 |
Prepayments and other current assets |  |  | 315 |  |  |  | 297 |  |  |  | 41 |
Total current assets |  |  | 3,167,295 |  |  |  | 3,208,064 |  |  |  | 439,502 |
Non-current assets: |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment |  |  | 337 |  |  |  | — |  |  |  | — |
Property and equipment, net |  |  | 627 |  |  |  | 77 |  |  |  | 11 |
Total non-current assets |  |  | 964 |  |  |  | 77 |  |  |  | 11 |
Total assets |  |  | 3,168,259 |  |  |  | 3,208,141 |  |  |  | 439,513 |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Inter-company payables |  |  | 2,399,333 |  |  |  | 2,626,851 |  |  |  | 359,876 |
Accrued liabilities and other current liabilities |  |  | 516 |  |  |  | 463 |  |  |  | 63 |
Total current liabilities |  |  | 2,399,849 |  |  |  | 2,627,314 |  |  |  | 359,939 |
Total liabilities |  |  | 2,399,849 |  |  |  | 2,627,314 |  |  |  | 359,939 |
|  | As of December 31, |
|  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | US$ |
LIABILITIES AND SHAREHOLDERS’ EQUITY (CONTINUED) |  |  |  |  |  |  |  |  |  |  |  |
Shareholders’ equity: |  |  |  |  |  |  |  |  |  |  |  |
Class A ordinary shares (par value of US$0.0002 per share; 230,000,000 shares authorized; 85,115,600 and 90,289,123 shares issued and outstanding as of December 31, 2023 and 2024, respectively) |  |  | 116 |  |  |  | 124 |  |  |  | 17 |
Class B ordinary shares (par value of US$0.0002 per share; 20,000,000 shares authorized; 17,324,848 shares issued and outstanding as of December 31, 2023 and 2024) |  |  | 21 |  |  |  | 21 |  |  |  | 3 |
Treasury stock |  |  | (65,896 | ) |  |  | (63,264 | ) |  |  | (8,667 | )
Additional paid-in capital |  |  | 4,849,337 |  |  |  | 5,002,255 |  |  |  | 685,306 |
Accumulated deficits |  |  | (3,853,635 | ) |  |  | (4,200,261 | ) |  |  | (575,433 | )
Accumulated other comprehensive loss |  |  | (161,533 | ) |  |  | (158,048 | ) |  |  | (21,652 | )
Total shareholders’ equity |  |  | 768,410 |  |  |  | 580,827 |  |  |  | 79,574 |
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  | 3,168,259 |  |  |  | 3,208,141 |  |  |  | 439,513 |
Condensed Income Statement [Table Text Block] | Condensed Statements of Comprehensive Loss
|  | For the years ended December 31, |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Revenues |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cost of revenues |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Gross profit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  | (31,041 | ) |  |  | (11,616 | ) |  |  | (13,128 | ) |  |  | (1,799 | )
Impairment loss on long-lived assets |  |  | — |  |  |  | — |  |  |  | (102 | ) |  |  | (14 | )
Share of losses in subsidiaries, the VIE and the VIE’s subsidiaries |  |  | (943,534 | ) |  |  | (645,522 | ) |  |  | (337,078 | ) |  |  | (46,181 | )
Total operating expenses |  |  | (974,575 | ) |  |  | (657,138 | ) |  |  | (350,308 | ) |  |  | (47,994 | )
Loss from operations |  |  | (974,575 | ) |  |  | (657,138 | ) |  |  | (350,308 | ) |  |  | (47,994 | )
Interest income |  |  | 3,636 |  |  |  | 3,811 |  |  |  | 4,021 |  |  |  | 551 |
Other expense, net |  |  | (294 | ) |  |  | (362 | ) |  |  | (339 | ) |  |  | (46 | )
Loss before income taxes |  |  | (971,233 | ) |  |  | (653,689 | ) |  |  | (346,626 | ) |  |  | (47,489 | )
Income tax expenses |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Net loss |  |  | (971,233 | ) |  |  | (653,689 | ) |  |  | (346,626 | ) |  |  | (47,489 | )
Other comprehensive (loss) income, net of tax of nil: |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Foreign currency translation adjustments |  |  | 41,347 |  |  |  | 4,189 |  |  |  | 3,485 |  |  |  | 477 |
Total comprehensive loss |  |  | (929,886 | ) |  |  | (649,500 | ) |  |  | (343,141 | ) |  |  | (47,012 | )
Condensed Cash Flow Statement [Table Text Block] | Condensed Statements of Cash Flows
|  | For the years ended December 31, |
|  | 2022 |  |  | 2023 |  |  | 2024 |
|  | RMB |  |  | RMB |  |  | RMB |  |  | US$ |
Net cash used in operating activities |  |  | (19,357 | ) |  |  | (19,253 | ) |  |  | (7,833 | ) |  |  | (1,074 | )
Net cash used in investing activities |  |  | 125,576 |  |  |  | (41,305 | ) |  |  | (5,840 | ) |  |  | (799 | )
Net cash (used in) generated from financing activities |  |  | (66,850 | ) |  |  | — |  |  |  | 8,902 |  |  |  | 1,220 |
Effect of exchange rate changes |  |  | 1,508 |  |  |  | 813 |  |  |  | 90 |  |  |  | 12 |
Net increase (decrease) in cash, cash equivalents and restricted cash |  |  | 40,877 |  |  |  | (59,745 | ) |  |  | (4,681 | ) |  |  | (641 | )
Cash, cash equivalents and restricted cash at the beginning of year |  |  | 33,101 |  |  |  | 73,978 |  |  |  | 14,233 |  |  |  | 1,950 |
Cash, cash equivalents and restricted cash at the end of year |  |  | 73,978 |  |  |  | 14,233 |  |  |  | 9,552 |  |  |  | 1,309 |

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