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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 ¥ (140,584) $ (22,060) ¥ (225,075) ¥ (109,841)
Adjustments to reconcile net loss to net cash used in operating activities:        
Depreciation of property and equipment 27,337 4,290 37,704 30,059
Amortization of intangible assets 4,481 703 4,366 2,307
Unrealized exchange gain     (90) (1,731)
Allowance for doubtful accounts (246) (39) 18,732 20,054
Interest expenses, net 2,857 448 7,931 8,094
Impairment of long-term investments 25,370 3,981 38,739 0
Impairment of property and equipment     10,952  
Impairment of amount due from related companies     479  
Impairment of loans 528 83 4,500  
Loss/(gain) on disposal of property and equipment (821) (129) 23 15
Gain on an equity investment sold       (6,778)
Unrealized gain on equity investments held       (17,298)
Change in fair value of structured deposits (20) (3) (1,233) (3,117)
Change in fair value of foreign currency swap contract (6,060) (951)    
Share-based compensation expenses 30,212 4,741 28,858 47,284
Changes in operating assets and liabilities,        
Accounts and notes receivable 1,271 199 71,799 (25,443)
Prepayments and other current assets 13,572 2,130 43,281 1,149
Amounts due from related parties (35) (5) 43 4,043
Other non-current assets 370 58 11 702
Accounts payable 1,699 267 (3,403) 1,220
Deferred revenue and customer deposits 8,605 1,350 29,520 19,027
Tax payable (81) (13) (115) 162
Accrued interest related to convertible notes 21,049 3,303    
Accrued liabilities and other current liabilities (25,596) (4,015) 8,908 13,219
Amounts due to related parties 54 8 (56) (8,809)
Other non-current liabilities 1,486 233 (64) (76)
Net cash (used in)/provided by operating activities (76,650) (12,027) 75,810 (25,758)
Cash flows from investing activities:        
Purchase of short-term investments     (470,169) (995,000)
Proceeds from maturities of short-term investments 50,000 7,846 391,964  
Proceeds from maturities of structured deposits       1,000,201
Purchase of long-term investments     (36,012) (47,286)
Proceeds from an equity investment sold       10,000
Investment in loans (2,000) (314) (8,000)  
Investment in convertible loans (4,859) (762)   (8,000)
Purchase of property and equipment (16,291) (2,556) (19,685) (39,494)
Proceeds from disposal of property and equipment 2,238 351 133 199
Purchase of intangible assets (2,646) (415) (2,646) (9,586)
Net cash (used in)/provided by investing activities 26,442 4,150 (144,415) (88,966)
Cash flows from financing activities:        
Proceeds from short-term bank loan 150,000 23,538    
Proceeds from issuance of common shares 1      
Repurchase of ordinary shares       (37,559)
Repayment of convertible notes (207,459) (32,555)    
Proceeds from exercise of share options 2,938 461 315 3,676
Net cash (used in)/provided by financing activities (54,520) (8,556) 315 (33,883)
Effect of exchange rate on cash and cash equivalents and restricted cash 3,080 483 (7,054) 3,504
Net decrease in cash and cash equivalents and restricted cash (101,648) (15,950) (75,344) (145,103)
Cash, cash equivalents and restricted cash at the beginning of year 356,230 55,900 431,574 576,677
Cash and cash equivalents at the beginning of the year 356,115 55,882 431,459 576,562
Restricted cash at the beginning of the year 115 18 115 115
Cash, cash equivalents and restricted cash at the end of year 254,582 39,950 356,230 431,574
Cash and cash equivalents at the end of the year 90,552 14,210 356,115 431,459
Restricted cash at the end of the year 164,030 25,740 115 115
Supplemental disclosures of cash flow information:        
Income tax paid 182 29 195  
Interest expense paid 4,513 708    
Non-cash investing and financing activities:        
Acquisition of long-term investments     8,000 27,410
Purchase of property and equipment included in accrued liabilities and other current liabilities ¥ 2,484 $ 390 1,355 ¥ 4,140
Purchase of intangible assets included in accrued liabilities and other current liabilities     ¥ 2,503