SHAREHOLDERS' EQUITY - Dividend Equivalent Liability (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
Short-term	$ 218	$ 437
Long-term	104	477
Total	$ 322	$ 914

Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

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