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Notes Payable - Additional Information (Detail) - USD ($) |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 13, 2017 | Jun. 30, 2017 | Jun. 06, 2017 | Mar. 23, 2017 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
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 periodic payment amount |  | $ 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 is subject to an interest “make-whole” provision such that any prepayment of the principal thereunder in excess of $1.50 million (the “Prepayment Threshold”) within one year of the date of issuance (the “Make-Whole Period”) shall be subject to the payment of a prepayment premium, on the date of such prepayment, in an amount based on an interest rate of 11.5% per annum of the prepayment amount in excess of the Prepayment Threshold for the portion of the Make-Whole Period that will remain after the date that the prepayment is made.
Debt instrument, prepayment of principal after Make Whole Period |  |  |  |  | After the one year Make- Whole Period the Note may be prepaid in part or in full with no penalty.
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 |  |  |  |  | $ 370,000
HD Special-Situations III, L.P. | Senior Secured Term Note | Purchase Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, remaining principal payable period |  |  |  |  | 48 months
Additional interest rate in case of default |  |  |  |  | 4.00%
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. 07, 2018 |  |
HD Special-Situations III, L.P. | Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of lines of credit |  |  |  | $ 1,000,000 |
HD Special-Situations III, L.P. | Minimum | Senior Secured Term Note |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Prepayment Threshold |  |  |  | $ 1,500,000 |

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