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INCOME TAXES - Schedule of Gross Unrecognized Tax Benefits (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Beginning balance: $ 29,124 $ 44,488
Increases related to tax positions taken during the current year 4,565 19,765
Decreases related to expiration of statute of limitations   (35,129)
Other adjustments $ (33,689)  
Ending balance:   $ 29,124