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SIGNIFICANT ACCOUNTING POLICIES - Borrowings (Details) - USD ($)
Jun. 04, 2019
Dec. 31, 2017
Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility   $ 15,000,000
Loan Agreement | Revolving Credit Facility    
Debt Instrument [Line Items]    
Revolving credit facility   15,000,000
Note payable to Squadron    
Debt Instrument [Line Items]    
Long-term debt   20,000,000
Note payable to Squadron | Loan Agreement    
Debt Instrument [Line Items]    
Long-term debt   $ 20,000,000
Term loan facility with Squadron | Loan Agreement    
Debt Instrument [Line Items]    
Debt face amount $ 30,000,000