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STOCKHOLDERS' EQUITY (At The Market Offering Agreement) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 | Apr. 02, 2021 | Jun. 30, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Apr. 13, 2020
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |
Proceeds from issuance of common stock |  |  |  | $ 16,207 | $ 2,607 |  |
AGP | At The Market Offering Agreement |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock, par value |  | $ 0.01 |  |  |  |  |
Aggregate sales proceeds of common stock |  | $ 22,000 |  |  |  |  |
Aggregate authorized offering price |  |  |  |  |  |  | $ 50,000
Percentage of cash fee |  | 3.00% |  |  |  |  |
Proceeds from issuance of common stock |  |  | $ 14,900 | $ 14,900 |  |  |
Shares issued (in shares) | 0 |  | 4,501,000 | 4,501,000 |  |  |

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