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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Reconciliation of reportable segment revenues (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥)
Segment reporting |  |  |  |
Net revenues | $ 567,677 | ¥ 3,952,053 | ¥ 1,785,970 | ¥ 959,486
Total profit for reportable segments |  | 142,828 | 88,527 | 80,498
Unallocated amounts: |  |  |  |
Net revenues | 567,677 | 3,952,053 | 1,785,970 | 959,486
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
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, net | 120 | 834 | 11,531 | 4,229
Loss before income taxes | (72,083) | (501,827) | (382,033) | (249,327)
Product |  |  |  |
Segment reporting |  |  |  |
Net revenues |  | 3,929,698 | 1,770,227 | 949,217
Unallocated amounts: |  |  |  |
Net revenues |  | 3,929,698 | 1,770,227 | 949,217
Cost of products sold | $ (543,950) | (3,786,870) | (1,681,700) | (868,719)
Service |  |  |  |
Segment reporting |  |  |  |
Net revenues |  | 22,355 | 15,743 | 10,269
Unallocated amounts: |  |  |  |
Net revenues |  | ¥ 22,355 | ¥ 15,743 | ¥ 10,269

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