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Notes Payable - Additional Information (Detail) - USD ($)
 12 Months Ended
Aug. 12, 2018
Nov. 13, 2017
Jun. 30, 2017
Jun. 06, 2017
Mar. 23, 2017
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]              
Warrant exercise price per share         $ 2.26    
Fair value of warrants recognized as an increase in additional paid-in-capital             $ 365,000
HD Special-Situations III, L.P. | Senior Secured Term Note              
Debt Instrument [Line Items]              
Debt principal amount         $ 7,000,000    
Debt principal repayment     $ 500,000        
Debt instrument, initial repayment date         Jun. 30, 2017    
Debt instrument, payment terms           $7.00 million principal amount Senior Secured Term Note (the “Note”) with principal of $0.50 million due and paid on June 30, 2017 with the balance due 48 months after issuance for cash at par pursuant to a Note Purchase Agreement (the “Purchase Agreement”).  
Interest rate         11.50%    
Debt instrument, description incase of prepayment principal           The Note was subject to an interest “make-whole” provision under which any prepayment of principal in excess of $1.50 million (the “Prepayment Threshold”) within one year of the date of issuance (the “Make-Whole Period”) would have been subject to the payment premium based on an interest rate of 11.5% per year of the prepayment amount in excess of the Prepayment Threshold for the remaining portion of the Make-Whole Period that would have remained after the prepayment was made.  
Repayment of notes including accrued and unpaid interest required to be made $ 6,400            
Unamortized loan costs 300,000            
Unamortized debt discount 400,000            
Interest expense on debt $ 700,000            
Minimum principal reductions per month   $ 30,000          
Minimum principal reductions, begining period   2018-04          
Warrants issued to purchase of common stock   500,000          
Warrant exercise price per share   $ 2.26          
Warrants expiration period   2022-11          
Fair value of warrants recognized as an increase in additional paid-in-capital             $ 400,000
HD Special-Situations III, L.P. | Senior Secured Term Note | Purchase Agreement              
Debt Instrument [Line Items]              
Debt, remaining principal payable period           48 months  
HD Special-Situations III, L.P. | Senior Secured Term Note | Loan Agreement | M&I Brazil | Former Chairman of AETI              
Debt Instrument [Line Items]              
Interest rate       10.00%      
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  
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      
HD Special-Situations III, L.P. | Revolving Credit Facility              
Debt Instrument [Line Items]              
Proceeds from sale of note available for working capital and general business purposes         $ 1,000,000    
HD Special-Situations III, L.P. | Minimum | Senior Secured Term Note              
Debt Instrument [Line Items]              
Prepayment Threshold         $ 1,500,000