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Notes Payable - Additional Information (Detail) - USD ($)
3 Months Ended
Jun. 06, 2017
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Short-term financing   $ 536,000 $ 202,000
Santander bank      
Debt Instrument [Line Items]      
Interest rate   11.88%  
Debt instrument, maturity date   Mar. 31, 2020  
Short-term financing   $ 200,000  
Senior Secured Term Note | Loan Agreement | M&I Brazil | Former Chairman of AETI      
Debt Instrument [Line Items]      
Line of credit facility, agreement date Jun. 06, 2017    
Line of credit facility, maximum borrowing capacity $ 300,000    
Loan facility drawn and outstanding   $ 200,000  
Interest rate 10.00%    
Debt instrument, interest rate terms   the interest rate on the loan facility is 10.0%, per annum, payable each quarter.  
Debt instrument, maturity date Jun. 30, 2019