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ORGANIZATION AND PRINCIPAL ACTIVITIES - Acquisition of KAG (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2019 shares | Dec. 31, 2020 shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 shares
Business Acquisition [Line Items] |  |  |  |  |
Exchange ratio for restatement of equity |  | 0.1562 |  |  |
Par value of ordinary shares | $ |  |  |  | $ 2 |
Retrospective adjustment to addition paid-in capital for subscription receivable | $ |  |  |  | $ 2 |
Weighted average shares outstanding, basic and diluted (in shares) | [1] |  | 41,715,834 | 33,146,593 | 24,984,300
Common Stock reserved |  |  |  | 4,200,000 |
Before adjustment |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Par value of ordinary shares | $ |  |  |  | $ 16 |
Subscription receivable | $ |  |  |  | $ 16 |
Weighted average shares outstanding, basic and diluted (in shares) |  |  |  |  | 160,000,000
Reverse recapitalization | KAG |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of issued and outstanding shares acquired |  | 100.00% |  |  |
Number of ordinary shares acquired |  | 160,000,000 |  |  |
Number of shares issued in exchage of consideration |  | 28,284,300 |  |  |
Number of shares held in escrow |  | 3,300,000 |  |  |
[1] | Share and per share data have been retroactively restated to give effect to the reverse recapitalization that is discussed in Note 1(a)

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