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Consolidated Statements of Cash Flows
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Cash flows from operating activities:        
Net Loss ¥ (127,300) $ (19,969) ¥ (82,184) ¥ (132,957)
Adjustment to reconcile net loss to net cash generated from/(used in) operating activities:        
Depreciation of property, equipment and leasehold improvement 19,200 3,017 17,677 10,772
Amortization of intangible assets 1,700 265 1,593 1,763
Amortization of right-of-use assets 10,329 1,621 8,569  
Foreign exchange losses/(gains) 738 116 836 (1,178)
Investment (gains)/losses     (1,241) 0
Interest expense     2,395  
Share-based compensation 37,359 5,862 50,741  
Gains on disposal of property equipment and software     (28)  
Changes in operating assets and liabilities:        
Accounts receivable 1,903 299 (5,382) 3,506
Prepayments and other current assets (15,935) (2,501) (4,989) (12,850)
Accounts payable 2,526 396 5,968 (4,416)
Deferred revenue 3,656 574 2,471 3,862
Salary and welfare payable 29,998 4,707 26,393 29,414
Taxes payable 1,691 266 6,044 (2,253)
Lease liabilities (8,279) (1,299) (8,555)  
Accrued expenses and other current liabilities 2,886 453 14,277 8,584
Other non-current liabilities (959) (150) 5,411  
Net cash (used in)/generated from operating activities (40,400) (6,343) 39,996 (95,753)
Cash flows from investing activities:        
Purchase of property, equipment and leasehold improvement (20,075) (3,150) (21,246) (27,865)
Purchase of intangible assets (855) (134) (1,759) (1,505)
Purchase of short-term investments     (86,305)  
Maturities of short-term investments 73,022 11,459 14,505  
Net cash received from disposal of property, equipment and leasehold improvement 9 1 246 0
Net cash (used in)/generated from investing activities 52,101 8,176 (94,559) (29,370)
Cash flows from financing activities:        
Proceeds from issuance of ordinary shares, net 183,188 28,746 259,043  
Proceeds from excercise of vested share options 3   2  
Proceeds from short-term loans 49,248 7,728 69,942  
Repayments of short-term loans (19,757) (3,100) (30,941)  
Net cash generated from financing activities 212,682 33,374 298,046  
Effect of foreign exchange rate changes on cash, cash equivalents and restricted cash (6,063) (952) (7,038) 2,228
Net (decrease) /increase in cash, cash equivalents and restricted cash 218,294 34,255 236,445 (122,895)
Cash, cash equivalents and restricted cash at beginning of the year 319,154 50,082 82,709 205,604
Cash, cash equivalents and restricted cash at end of the year 537,448 84,337 319,154 82,709
Supplemental disclosures of cash flow information:        
Cash paid for interest expenses (3,141) (493) (1,888)  
Income taxes paid (924) (145)    
Accretions to preferred shares redemption value ¥ 0 $ 0 ¥ 154,066 ¥ 940,186