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CONVERTIBLE REDEEMABLE PREFERRED SHARES - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended |  |
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Jun. 30, 2018 CNY (¥) shares | Jun. 30, 2018 USD ($) shares | Feb. 28, 2018 CNY (¥) shares | Feb. 28, 2018 USD ($) $ / shares shares | Jan. 31, 2017 CNY (¥) shares | Nov. 30, 2016 CNY (¥) | Nov. 30, 2016 USD ($) | Jul. 31, 2015 CNY (¥) shares | Nov. 30, 2018 $ / shares | Jun. 30, 2018 USD ($) shares
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  |  |  | 272,600,000 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  | ¥ 14,062 |  |  |  |  |  |  |
Finders commission |  |  | ¥ 12,600 | $ 2,000 |  |  |  |  |  |
Stock issued during period | shares |  |  | 110,803,324 | 110,803,324 |  |  |  |  |  |
Proceeds from issue of preferred stock |  |  | ¥ 630,010 | $ 100,000 |  |  |  |  |  |
Series B Preferred Stock [Member] | Payment One [Member] |  |  |  |  |  |  |  |  |  |
Finders commission payment percent | 50.00% | 50.00% |  |  |  |  |  |  |  |
Finders commission payment Value | $ |  | $ 1,000 |  |  |  |  |  |  |  |
Series B Preferred Stock [Member] | Payment Two [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period | shares | 1,108,033 | 1,108,033 |  |  |  |  |  |  |  |
Finders commission payment percent | 50.00% | 50.00% |  |  |  |  |  |  |  |
Series Seed Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period | shares |  |  |  |  |  |  |  | 373,000,000 |  |
Series B Plus Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
Stock issuance costs | ¥ 5,867 |  |  |  |  |  |  |  |  |
Preferred Stock, Shares Authorized | shares | 21,105,395 |  |  |  |  |  |  |  |  | 21,105,395
Preferred stock shares authorized value | ¥ 128,416 |  |  |  |  |  |  |  |  | $ 20,000
Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |
Preferred shares par value | $ / shares |  |  |  |  |  |  |  |  | $ 0.000005 |
Issue Two [Member] | Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period | shares |  |  | 116,600,000 | 116,600,000 |  |  |  |  |  |
Shares issued price per share | $ / shares |  |  |  | $ 0.000005 |  |  |  |  |  |
Series Seed Capital Contribution [Member] |  |  |  |  |  |  |  |  |  |
Capital injuction |  |  |  |  |  |  |  | ¥ 50,000 |  |
Stock issuance costs |  |  |  |  |  |  |  | ¥ 1,000 |  |
Series A Beneficiary Owners [Member] |  |  |  |  |  |  |  |  |  |
Stock issuance costs |  |  |  |  | ¥ 8,095 |  |  |  |  |
Proceeds from warrant exercise |  |  |  |  |  | ¥ 644 |  |  |  |
Finders commission |  |  |  |  | 6,509 |  |  |  |  |
Series A Beneficiary Owners [Member] | Contribution One [Member] |  |  |  |  |  |  |  |  |  |
Capital injuction |  |  |  |  |  | 33,160 | $ 20,000 |  |  |
Series A Beneficiary Owners [Member] | Contribution Two [Member] |  |  |  |  |  |  |  |  |  |
Capital injuction |  |  |  |  |  | ¥ 138,532 |  |  |  |
Series A Beneficiary Owners [Member] | Warrant [Member] |  |  |  |  |  |  |  |  |  |
Fair value of warrant liability |  |  |  |  | ¥ 1,754 |  |  |  |  |

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