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CONSOLIDATED STATEMENTS OF CASH FLOWS
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Operating activities:        
Net loss $ (72,083) ¥ (501,827) ¥ (382,041) ¥ (249,327)
Adjustments to reconcile net income to net cash used in operating activities:        
Share-based compensation 7,797 54,281 51,359 9,921
Depreciation and amortization 1,676 11,668 11,266 14,820
(Gain) loss on disposal of property and equipment (1) (5) 1,110 (10)
Inventory provision 113 790    
Impairment loss 1,580 11,000    
Investment Income (1,384) (9,635) (10,869)  
Noncash lease expense 3,648 25,394    
Changes in operating assets and liabilities:        
Accounts receivable (5,268) (36,678) (8,171) 7,990
Notes receivable (3,388) (23,587)    
Inventories (39,677) (276,225) (66,780) (9,322)
Prepayments and other current assets (6,818) (47,457) (56,329) (7,459)
Other non-current assets 53 367 (3,376)  
Accounts payable 33,336 232,076 84,118 30,157
Accrued expenses and other current liabilities 10,684 74,376 28,560 (1,142)
Operating lease liabilities (3,551) (24,721)    
Other non-current liabilities (316) (2,199) 8,135  
Net cash used in operating activities (73,599) (512,382) (343,018) (204,372)
Investing activities:        
Purchases of property and equipment (2,877) (20,030) (14,443) (6,798)
Purchases of intangible assets (658) (4,580) (376) (62)
Purchase of long-term investments       (140)
Purchase of short-term investments (86,328) (601,000) (519,187) (109,380)
Proceeds from sale or maturity of short-term investments 123,977 863,106 578,359 80,198
Proceeds from disposition of property and equipment, net 26 179 101 57
Net cash (used in) provided by investing activities 34,140 237,675 44,454 (36,125)
Financing activities:        
Proceeds from ordinary shareholders 1,627 11,328   25
Payments of share repurchase (3,302) (22,991)    
Proceeds from IPO, net of issuance cost     694,878  
Proceeds from short-term bank borrowings 21,678 150,919    
Repayment of short-term bank borrowings (8,021) (55,838)    
Net proceeds from other financing activities 3,673 25,569    
Proceeds from preferred shareholders     277,819 49,475
Net cash provided by financing activities 15,655 108,987 972,697 49,500
Effect of exchange rate changes on cash and cash equivalents, and restricted cash 1,394 9,702 11,947 (14,848)
Net (decrease) increase in cash and cash equivalents, and restricted cash (22,410) (156,018) 686,080 (205,845)
Cash and cash equivalents, and restricted cash at the beginning of the year 122,632 853,740 167,660 373,505
Cash and cash equivalents, and restricted cash at the end of the year 100,222 697,722 853,740 167,660
Supplemental disclosure of cash flow information:        
Interest paid 117 818    
Income tax paid     8  
Supplemental disclosures of non-cash investing and financing activities:        
Change in fair value of available-for-sale investments 1,054 7,335 8,734 5,181
Purchases of property and equipment included in payables $ 163 ¥ 1,133 ¥ 848 ¥ 164