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CONSOLIDATED STATEMENTS OF CASH FLOWS
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (loss) ¥ 180,907 $ 25,479 ¥ 109,819 ¥ (37,051)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:        
Depreciation and amortization 11,690 1,647 10,832 6,418
Share-based compensation 9,435 1,329 13,044 15,175
Allowance of credit losses 519 73 5,026 225
Provision (reversal) of inventory reserve (425) (60) 2,207 1,443
Non-cash operating lease expenses 10,349 1,458 21,567 21,755
Changes in operating assets and liabilities:        
Accounts receivable 18,293 2,577 (28,508) 21,608
Amounts due from related parties 476 67 4,782 (6,746)
Inventories 3,034 427 6,720 (12,624)
Prepayments and other current assets 13,348 1,880 (29,813) (8,249)
Other non-current assets (2,206) (311) (2,729) 182
Accounts payable (2,081) (293) (6,330) 8,985
Amounts due to related parties (2,516) (354) (1,909) 8,368
Deferred revenue and customer advances (60,483) (8,519) 76,083 34,367
Operating lease liabilities (6,373) (898) (21,331) (25,838)
Accrued expenses and other current liabilities (1,845) (260) 29,006 10,196
Net cash provided by operating activities 172,122 24,242 188,466 38,214
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchases of property and equipment and intangible assets (6,509) (917) (6,588) (32,283)
Payment for long-term investment     (26,333)  
Placements of time deposits (380,344) (53,570) (222,941)  
Proceeds from maturity of time deposits 380,344 53,570 222,941  
Proceeds from disposal of property and equipment     79 332
Net cash used in investing activities (6,509) (917) (32,842) (31,951)
CASH FLOWS FROM FINANCING ACTIVITIES        
Repurchase of ordinary shares (9,542) (1,344) (6,959) (164)
Proceeds from assets transferred under common control       97
Proceeds received from exercise of share options 94 13 3 477
Net cash provided by (used in) financing activities (9,448) (1,331) (6,956) 410
Effect of exchange rate changes on cash and cash equivalents 7,603 1,073 45,969 (12,993)
Net change in cash and cash equivalents 163,768 23,067 194,637 (6,320)
Cash and cash equivalents at the beginning of the year 1,049,999 147,889 855,362 861,682
Cash and cash equivalents at the end of the year 1,213,767 170,956 1,049,999 855,362
Supplemental disclosures of cash flow information:        
Cash paid for income taxes 23,276 3,278 8,363 459
Supplemental disclosures of non-cash information:        
Purchase of property and equipment, and intangible assets included in accrued expenses and other current liabilities 1,339 189 771 1,867
Operating lease right-of-use assets obtained in exchange for operating lease liabilities from new leases ¥ 830 $ 117 ¥ 229 ¥ 50,500