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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) ¥ / shares shares | Dec. 31, 2018 CNY (¥) ¥ / shares shares | Dec. 31, 2017 CNY (¥) ¥ / shares shares
Net revenues: |  |  |  |
Net revenues | $ 567,677 | ¥ 3,952,053 | ¥ 1,785,970 | ¥ 959,486
Operating costs and expenses: |  |  |  |
Cost of products sold |  | (128,996) | (73,930) | (55,880)
Selling and marketing expenses | (48,919) | (340,562) | (260,040) | (190,074)
General and administrative expenses | (17,740) | (123,501) | (98,759) | (53,434)
Technology expenses | (8,892) | (61,902) | (71,248) | (48,133)
Other operating income (expenses), net | (536) | (3,735) | (668) | 2,732
Total operating costs and expenses | (638,566) | (4,445,566) | (2,186,345) | (1,213,508)
Loss from operations | (70,889) | (493,513) | (400,375) | (254,022)
Interest income | 690 | 4,802 | 4,352 | 4,013
Interest expense | (520) | (3,622) |  | (55)
Foreign exchange (loss) gain | (1,484) | (10,328) | 2,459 | (3,492)
Other income (loss), net | 120 | 834 | 11,531 | 4,229
Loss before income taxes | (72,083) | (501,827) | (382,033) | (249,327)
Income tax expense |  |  | (8) |
Net loss | (72,083) | (501,827) | (382,041) | (249,327)
Net loss attributable to non-controlling interest | 319 | 2,221 | 1,950 | 747
Net loss attributable to ordinary shareholders | (71,764) | (499,606) | (380,091) | (248,580)
Other comprehensive income (loss) |  |  |  |
Unrealized gains of available-for-sale securities, net of tax of nil for 2017, 2018 and 2019 | 1,054 | 7,335 | 8,734 | 5,181
Realized gains of available-for-sale securities, net of tax | (1,384) | (9,635) | (10,869) | (1,154)
Foreign currency translation adjustments | 1,676 | 11,668 | 21,658 | (21,347)
Comprehensive loss | $ (70,418) | ¥ (490,238) | ¥ (360,568) | ¥ (265,900)
Loss per share: |  |  |  |
Loss per share basic and diluted | (per share) | $ (0.44) | ¥ (3.05) | ¥ (3.82) | ¥ (3.45)
Weighted average number of shares used in computation of loss per share: |  |  |  |
Weighted average number of shares used in computation of loss per share, Basic and diluted | shares | 163,671,577 | 163,671,577 | 99,451,210 | 72,000,000
Product |  |  |  |
Net revenues: |  |  |  |
Net revenues |  | ¥ 3,929,698 | ¥ 1,770,227 | ¥ 949,217
Operating costs and expenses: |  |  |  |
Cost of products sold | $ (543,950) | (3,786,870) | (1,681,700) | (868,719)
Fulfillment expenses |  |  |  |
Operating costs and expenses: |  |  |  |
Cost of products sold | $ (18,529) | ¥ (128,996) | ¥ (73,930) | ¥ (55,880)

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