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STOCK BASED COMPENSATION PLANS - Employee Stock Purchase Plan (Details) - USD ($)
1 Months Ended 12 Months Ended
May 31, 2018
Dec. 31, 2018
STOCK BASED COMPENSATION PLANS    
Common stock initially authorized for issuance under the ESPP, Shares 1,000,000  
Maximum contribution from employees $ 25,000  
Shares of common stock purchased under the ESPP   3,758
Expense recorded related to ESPP   $ 0