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INCOME TAXES - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Income Tax Examination [Line Items]          
Proceeds from income tax refunds $ 2,300,000        
Tax cuts and jobs act, transition tax for accumulated foreign earnings, income tax expense     $ 300,000    
Tax cuts and jobs act, change in tax rate, deferred tax asset, income tax expense     $ 3,000,000.0    
Provision of tax expense for one-time transition tax of Tax Act   $ 700,000      
Net operating loss carryforward   $ 2,000,000.0   $ 1,600,000 $ 1,500,000
Income tax examination net of federal and state tax benefit, accrued interest       100,000 $ 100,000
Reduction in income tax liability if tax positions sustained       2,000,000.0  
Change in unrecognized tax benefits reasonably possible       0  
Foreign          
Income Tax Examination [Line Items]          
Net operating loss carryforward       39,200,000  
State Jurisdiction          
Income Tax Examination [Line Items]          
Net operating loss carryforward       11,800,000  
State Jurisdiction | Capital Loss Carryforward          
Income Tax Examination [Line Items]          
Net operating loss carryforward       7,700,000  
US | Capital Loss Carryforward          
Income Tax Examination [Line Items]          
Net operating loss carryforward       $ 1,000,000.0