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v3.26.1

LEASES (Tables) | 12 Months Ended
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Dec. 31, 2025
LEASES |
Schedule of items related to operating leases in consolidated balance sheets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, 2024 | ​ ​ ​ | December 31, 2025 | ​ ​ ​ | December 31, 2025
​ | ​ | RMB | ​ | RMB | ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Operating lease right-of-use assets |  | 4,283 | ​ | 11,836 | ​ | 1,693
Operating lease liabilities-current portion |  | 2,841 | ​ | 4,189 | ​ | 599
Operating lease liabilities-non-current portion |  | 1,604 | ​ | 7,815 | ​ | 1,118
Schedule of lease cost | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Classification in Consolidated | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Statements of Operations | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ | and Comprehensive | ​ ​ | ​ | ​ ​ | ​ | ​ | ​ | ​ ​ | ​
​ | ​ ​ ​ | Income (Loss) | ​ ​ ​ | December 31, 2023 | ​ ​ ​ | December 31, 2024 | ​ ​ ​ | December 31, 2025 | ​ ​ ​ | December 31, 2025
​ | ​ | ​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
​ | ​ | ​ | ​ | ​ | ​ | (in thousands) | ​ | ​ | ​ | (Note 3)
Operating lease cost | ​ | Operating expenses | ​ | 5,428 | ​ | 4,602 | ​ | 4,854 | ​ | 694
Cost of other leases with terms less than one year |  | Operating expenses |  | 80 | ​ | 85 | ​ | 211 | ​ | 30
Total |  | ​ |  | 5,508 | ​ | 4,687 | ​ | 5,065 | ​ | 724
Schedule of maturities of operating lease liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, 2024 | ​ ​ ​ | December 31, 2025 | ​ ​ ​ | December 31, 2025
​ | ​ | RMB | ​ | RMB | ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Due within one year |  | 2,969 | ​ | 4,659 | ​ | 666
Due in the second year |  | 444 | ​ | 4,670 | ​ | 668
Due in the third year |  | 455 | ​ | 3,091 | ​ | 442
Due in the fourth year | ​ | 466 | ​ | 415 | ​ | 60
Due in the fifth year | ​ | 415 | ​ | — | ​ | —
Total lease payments |  | 4,749 | ​ | 12,835 | ​ | 1,836
Less: imputed interest |  | (304) | ​ | (831) | ​ | (119)
Total |  | 4,445 | ​ | 12,004 | ​ | 1,717
Summary of weighted average remaining lease term and discount rate for the Group's operating leases | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025 | ​
Weighted average remaining lease term (in years) | ​ | 1.99 | ​ | 2.95 | ​
Weighted average discount rate | ​ | 4.65 | % | 4.65 | %
Schedule of supplemental cash flow information related to operating leases | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, 2023 | ​ ​ ​ | December 31, 2024 | ​ ​ ​ | December 31, 2025 | ​ ​ ​ | December 31, 2025
​ | ​ | RMB | ​ | RMB | ​ | RMB | ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Cash paid for amounts included in the measurement of operating lease liabilities | ​ | 6,196 |  | 4,817 | ​ | 4,884 | ​ | 698
​

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- Definition Tabular disclosure of lessee's lease cost. Includes, but is not limited to, interest expense for finance lease, amortization of right-of-use asset for finance lease, operating lease cost, short-term lease cost, variable lease cost and sublease income. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-4 + Details
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- Definition Tabular disclosure of undiscounted cash flows of lessee's operating lease liability. Includes, but is not limited to, reconciliation of undiscounted cash flows to operating lease liability recognized in statement of financial position. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-6 + Details
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