Annual report pursuant to Section 13 and 15(d)

LONG-TERM DEBT - Aeroleo (Details)

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LONG-TERM DEBT - Aeroleo (Details) - Aeroleo
1 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
note_payable
Oct. 01, 2015
USD ($)
Debt Instrument [Line Items]        
Contribution of capital from joint venture partner $ 6,300,000      
Notes Payable, 6% Per Annum | Loans Payable        
Debt Instrument [Line Items]        
Number of notes payable | note_payable     2  
Face amount   $ 8,300,000.0    
Notes Payable, 19.0% Per Annum | Loans Payable        
Debt Instrument [Line Items]        
Face amount       $ 1,400,000.0
Stated interest rate       19.00%
Repayments of debt $ 1,500,000