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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Liquidity (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 29, 2020 | Jun. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Working capital |  |  |  | $ 5,850 |  |
Proceeds from convertible loan |  |  |  |  | $ 21,000 |
Accumulated deficit |  |  |  | 197,492 | 192,189 |
Cash flows from operating activities |  |  |  | $ 3,878 | $ 4,745 | $ 9,749
Investment |  |  | $ 3,000 |  |  |
Renren Inc. |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Proceeds from convertible loan | $ 6,000 |  |  |  |  |
Renren Inc. | Subsequent Event [Member] |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Proceeds from convertible loan | $ 6,000 |  |  |  |  |
ATW Partners LLC |  |  |  |  |  |
Change in Accounting Estimate [Line Items] |  |  |  |  |  |
Proceeds from convertible loan |  | $ 3,000 |  |  |  |

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