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ORDINARY SHARES - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 04, 2019 $ / shares shares | May 03, 2019 shares | Jan. 01, 2018 | Jan. 31, 2018 $ / shares shares | Dec. 31, 2021 $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 shares | Aug. 28, 2019 USD ($) | Dec. 31, 2017 shares | Nov. 30, 2017 USD ($) $ / shares shares
Common stock shares authorized value | $ |  |  |  |  |  |  |  |  |  | $ 50
Common stock shares authorized |  |  |  |  | 20,000,000,000 | 20,000,000,000 | 20,000,000,000 |  |  | 500,000,000
Common stock par value | $ / shares |  |  |  |  | $ 0.000005 | $ 0.000005 |  |  |  | $ 0.0001
Conversion ratio |  |  |  |  | 1 |  |  |  |  |
Amount of shares authorised to be repurchased | $ |  |  |  |  |  |  |  | $ 20,000 |  |
Number of shares cumulatively repurchased |  |  |  |  | 40,463,770 | 40,076,270 |  |  |  |
Share repurchase price | $ / shares |  |  |  |  | $ 0.23 |  |  |  |  |
MrXiao Shanglue Founder and CEO [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 201,440,000 |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Common stock par value | $ / shares |  |  |  | $ 0.000005 |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  | 2,158,791,222 | 2,158,791,222 |  | 1 |
Common stock shares outstanding |  |  |  |  |  | 2,133,265,412 | 2,129,405,572 |  | 1 |
Stock issued during period stock split |  |  |  | 10,000,000,000 |  |  |  |  |  |
Stock split discription |  |  | 1 ordinary share was subdivided into 20 ordinary shares |  |  |  |  |  |  |
Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  | 1,208,831,222 | 1,208,831,222 | 1,208,831,222 |  |  |
Common stock shares outstanding |  |  |  |  | 1,196,575,392 | 1,183,305,412 | 1,179,445,572 |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 895,216,752 |  |  |  |  |
Common Class A [Member] | MrXiao Shanglue Founder and CEO [Member] |  |  |  |  |  |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 895,216,752 |  |  |  |  |
Common Class A [Member] | Over-Allotment Option [Member] |  |  |  |  |  |  |  |  |  |
Common stock par value | $ / shares | $ 1.10 |  |  |  |  |  |  |  |  |
Options Exercised | 2,174,470 |  |  |  |  |  |  |  |  |
Common Class A [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period |  | 110,000,000 |  |  |  |  |  |  |  |
Common Class A [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share repurchase price | $ / shares |  |  |  |  | $ 0.70 |  |  |  |  |
Common Class A [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share repurchase price | $ / shares |  |  |  |  |  | $ 0.09 |  |  |  |
Common Class B [Member] |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  | 949,960,000 | 949,960,000 | 949,960,000 |  |  |
Common stock shares outstanding |  |  |  |  | 949,960,000 | 949,960,000 | 949,960,000 |  |  |
Common Class B [Member] | MrXiao Shanglue Founder and CEO [Member] |  |  |  |  |  |  |  |  |  |
Voting power, Class B ordinary shares |  |  |  |  | one share with ten votes |  |  |  |  |
Conversion of Stock, Shares Converted |  |  |  |  | 949,960,000 |  |  |  |  |
American Depositary Shares [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |
Stock issued during period |  | 11,000,000 |  |  |  |  |  |  |  |

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