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PREFERRED SHARES AND WARRANT LIABILITIES - Additional information (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 29, 2020 | Dec. 28, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Total amount of investment agreed |  |  | $ 3,000,000 |  |  |
Proceeds from investment in convertible preferred shares |  |  |  | $ 3,000,000 |  |
Preferred shares, authorized |  |  |  | 6,000 |  |
Preferred shares, issued |  |  |  | 3,000 | 0 |
Exercise price of warrants | $ 3.00 |  |  |  |  |
Warrants outstanding |  |  |  | 11,957,008 | 11,957,008 | 10,582,008
Purchase Agreement |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Total amount of investment agreed | $ 6,000,000 |  |  |  |  |
Proceeds from investment in convertible preferred shares | 3,000,000 |  |  |  |  |
Preferred shares, issued |  |  |  | 3,000 |  |
Fair value allocated to preferred shares | $ 1,690,000 |  |  | $ 1,311,000 |  |
Exercise price of warrants | $ 3.00 |  |  |  |  |
Kaixin Auto Holdings [Member] | Purchase Agreement |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Preferred shares, authorized |  | 1,000,000 |  |  |  |
Conversion price |  | $ 3.00 |  |  |  |
Series A Warrants |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants issued/granted | $ 1,500,000 |  |  |  |  |
Series B Warrants |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants issued/granted | 1,333,333 |  |  |  |  |
Series C Warrants |  |  |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |  |  |
Warrants issued/granted | $ 2,000,000 |  |  |  |  |

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