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FAIR VALUE ACCOUNTING - Measured on Recurring Basis (Details) - Level 3
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Beginning balance $ 662
Fair value of warrants exercised 0
Change in fair value (662)
Ending balance $ 0