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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Balances of the VIEs and Short-term investments (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2019 CNY (¥) | Jan. 01, 2019 CNY (¥)
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 83,496 |  | ¥ 853,740 |  | ¥ 581,281 |
Restricted cash |  | 16,726 |  |  |  | 116,441 |
Short-term investments |  |  |  | 252,805 |  |  |
Accounts receivable |  | 9,372 |  | 28,569 | ¥ 20,398 | 65,247 |
Notes receivable |  | 3,388 |  |  |  | 23,587 |
Inventories |  | 69,848 |  | 210,836 |  | 486,271 |
Prepayments and other current assets |  | 29,965 |  | 161,147 |  | 208,604 | ¥ 159,776
Total current assets |  | 212,795 |  | 1,507,097 |  | 1,481,431 |
Property and equipment |  | 4,286 |  | 20,302 |  | 29,836 |
Intangible assets, net |  | 1,152 |  | 4,503 |  | 8,022 |
Long-term investments |  | 20 |  | 11,140 |  | 140 |
Operating lease right-of-use assets |  | 12,620 |  |  |  | 87,855 | 62,408
Other non-current assets |  | 432 |  | 3,376 |  | 3,009 |
Total assets |  | 231,305 |  | 1,546,418 |  | 1,610,293 | 1,607,455
Current liabilities |  |  |  |  |  |  |
Short-term borrowings |  | (13,658) |  |  |  | (95,081) |
Accounts payable |  | (63,825) |  | (212,258) |  | (444,334) |
Accrued expenses and other current liabilities |  | (33,613) |  | (102,261) |  | (234,008) | (122,056)
Total current liabilities |  | (111,096) |  | (314,519) |  | (773,423) |
Long-term operating lease liabilities |  | (8,189) |  |  |  | (57,011) | (41,242)
Total liabilities |  | (120,138) |  | (322,654) |  | (836,370) | ¥ (383,691)
Product revenues |  | 567,677 | ¥ 3,952,053 | 1,785,970 | 959,486 |  |
Total cost and expenses |  | (638,566) | (4,445,566) | (2,186,345) | (1,213,508) |  |
Net income (loss) |  | (71,764) | (499,606) | (380,091) | (248,580) |  |
Net cash used in operating activities |  | (73,599) | (512,382) | (343,018) | (204,372) |  |
Net cash used in investing activities |  | 34,140 | 237,675 | 44,454 | (36,125) |  |
Net cash provided by financing activities |  | $ 15,655 | 108,987 | 972,697 | 49,500 |  |
Short-term investments |  |  |  |  |  |  |
Impairment on available-for-sale debt securities |  |  | 0 | 0 | 0 |  |
VIEs |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |
Cash and cash equivalents |  |  |  | 8,527 |  | 40,964 |
Restricted cash |  |  |  |  |  | 12,631 |
Accounts receivable |  |  |  | 28,351 |  | 60,173 |
Notes receivable |  |  |  |  |  | 23,274 |
Inventories |  |  |  | 210,285 |  | 389,195 |
Prepayments and other current assets |  |  |  | 133,655 |  | 171,318 |
Total current assets |  |  |  | 380,818 |  | 697,555 |
Property and equipment |  |  |  | 9,962 |  | 15,599 |
Intangible assets, net |  |  |  | 382 |  | 774 |
Long-term investments |  |  |  | 11,140 |  | 140 |
Operating lease right-of-use assets |  |  |  |  |  | 67,103 |
Other non-current assets |  |  |  | 1,446 |  | 2,078 |
Total assets |  |  |  | 403,748 |  | 783,249 |
Current liabilities |  |  |  |  |  |  |
Short-term borrowings |  |  |  |  |  | (65,081) |
Accounts payable |  |  |  | (211,954) |  | (394,242) |
Accrued expenses and other current liabilities |  |  |  | (50,356) |  | (149,111) |
Total current liabilities |  |  |  | (262,310) |  | (608,434) |
Long-term operating lease liabilities |  |  |  |  |  | (47,750) |
Total liabilities |  |  |  | (262,310) |  | ¥ (656,184) |
Product revenues |  |  | 3,302,818 | 1,785,757 | 959,153 |  |
Total cost and expenses |  |  | (3,383,187) | (1,809,656) | (930,567) |  |
Net income (loss) |  |  | (80,369) | (23,899) | 28,586 |  |
Net cash used in operating activities |  |  | (263,750) | (112,425) | (124,409) |  |
Net cash used in investing activities |  |  | (4,684) | ¥ (7,308) | ¥ (54) |  |
Net cash provided by financing activities |  |  | ¥ 87,892 |  |  |  |
Percentage of consolidated revenues | 3.00% | 84.00% | 84.00% | 99.00% | 99.00% |  |
Percentage of consolidated total assets |  | 49.00% | 49.00% | 26.00% |  |  |
Percentage of consolidated total liabilities |  | 78.00% | 78.00% | 81.00% |  |  |
Yao Fang or WFOE | VIEs |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |
Advertising fees and marketing fees charged by WFOE |  |  | ¥ 126,831 | ¥ 79,742 | ¥ 162,844 |  |

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