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UNAUDITED INTERIM CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
¥ in Thousands, $ in Thousands
 6 Months Ended
Jun. 30, 2021
CNY (¥)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
CNY (¥)
Cash flows from operating activities:      
Net loss ¥ (69,434) $ (10,754) ¥ (91,446)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation of property and equipment 13,406 2,076 18,648
Amortization of intangible assets 2,190 339 2,157
Allowance for doubtful accounts 221 34 8,243
Interest expenses, net 2,706 419 3,870
Gain on disposal of property and equipment (814) (126) (12)
Change in fair value of structured notes (20) (3) (920)
Change in fair value of foreign currency swap contract (1,905) (295) 0
Share-based compensation expenses 19,036 2,948 16,111
Changes in operating assets and liabilities:      
Accounts and notes receivable 6,524 1,010 61,516
Prepayments and other current assets 4,885 757 11,960
Amounts due from related parties     16
Other non-current assets (291) (45) (124)
Accounts payable (2,934) (454) (4,036)
Deferred revenue and customer deposits (3,734) (578) 20,137
Accrued liabilities and other current liabilities (17,840) (2,763) (6,305)
Amounts due to related parties     (28)
Other non-current liabilities 1,138 176  
Net cash provided by/ (used in) operating activities (46,866) (7,259) 39,787
Cash flows from investing activities:      
Purchase of short-term investments     (360,250)
Proceeds from short-term investments 51,229 7,934 251,450
Purchase of long-term investments     (36,567)
Investment in loans     (5,000)
Investment in a convertible loan (4,223) (654)  
Purchase of property and equipment (16,212) (2,511) (16,332)
Proceeds from disposal of property and equipment 2,599 403 18
Purchase of intangible assets (1,265) (196) (1,201)
Net cash (used in)/provided by investing activities 32,128 4,976 (167,882)
Cash flows from financing activities:      
Proceeds from issuance of common shares 1    
Redemption of convertible notes (228,508) (35,391)  
Proceeds from short-term bank loan 150,000 23,232  
Proceeds from exercise of share options 2,884 446 457
Net cash used in financing activities (75,623) (11,713) 457
Effect of exchange rate on cash and cash equivalents and restricted cash 1,341 209 1,742
Net decrease in cash and cash equivalents and restricted cash (89,020) (13,787) (125,896)
Cash, cash equivalents and restricted cash at the beginning of the period 356,230 55,173 431,574
Cash and cash equivalents at the beginning of the period 356,115 55,155 431,459
Restricted cash at the beginning of the period 115 18 115
Cash, cash equivalents and restricted cash at the end of the period 267,210 41,386 305,678
Cash and cash equivalents at the end of the period 102,854 15,930 305,563
Restricted cash at the end of the period 164,356 25,456 115
Supplemental disclosures of cash flow information:      
Interest paid 1,196 185  
Income tax paid 34 5  
Non-cash investing and financing activities:      
Acquisition of long-term investments     8,000
Purchase of intangible assets     ¥ 2,446
Purchase of property and equipment ¥ 2,297 $ 356