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Debt - Additional Information (Detail) |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 30, 2019 USD ($) day shares | Aug. 21, 2017 USD ($) Installment | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | May 08, 2020 USD ($) | Apr. 07, 2020 | Aug. 16, 2019 USD ($) | Jul. 26, 2019 USD ($) | Sep. 30, 2014 | Sep. 30, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Convertible debt, exchanged | $ 7,000,000 |  | $ 0 | $ 6,889,000 |  |  |  |  |  |
Issuance of common stock in satisfaction of indebtedness (in shares) | shares | 1,470,807 |  |  |  |  |  |  |  |  |
Percent of volume-weighted average prices per share | 90.00% |  |  |  |  |  |  |  |  |
Consecutive trading days | day | 5 |  |  |  |  |  |  |  |  |
Gain on extinguishment of debt | $ 100,000 |  | 0 | 111,000 |  |  |  |  |  |
Annual commercial insurance premiums |  |  | 800,000 |  |  |  |  |  |  |
Outstanding principal amount of premium financed |  |  | $ 400,000 | 300,000 |  |  |  |  |  |
Insurance terms |  |  | 10 months |  |  |  |  |  |  |
Short-term financing |  |  | $ 432,000 | 558,000 |  |  |  |  |  |
Related party debt |  |  | $ 5,000,000 | 5,000,000 |  |  |  |  |  |
Plus accrued interest due on August, 24, 2017 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | $ 2,500,000 |  |  |  |  |  |  |  |
Plus accrued interest due on August 24, 2018 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | 2,500,000 |  |  |  |  |  |  |  |
Plus accrued interest due on August 24, 2019 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | 2,500,000 |  |  |  |  |  |  |  |
Plus accrued interest on each anniversary date of August 24, 2019 thereafter |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | $ 1,500,000 |  |  |  |  |  |  |  |
Debt instrument number of installment | Installment |  | 4 |  |  |  |  |  |  |  |
Plus accrued interest on the remaining unpaid balance of the Amended Secured Term Note Payable on August 24, 2024 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | $ 600,000 |  |  |  |  |  |  |  |
Event all principal and interest is paid in full by August 24, 2023 to be forgiven |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Payment terms of principal and interest |  | $ 2,200,000 |  |  |  |  |  |  |  |
Santander Bank |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 11.88% |  |  | 12.68% |  |  |  |
Short-term financing |  |  |  | 41,000 |  |  |  |  |  |
Brazilian Interbank |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 7.60% |  |  |  |  |  |  |
Debt instrument, interest rate basis (as a percent) |  |  | 1.90% |  |  |  |  |  |  |
Outstanding principal amount of premium financed |  |  | $ 231,000 |  |  |  |  |  |  |
Loan Pursuant to CARES Act | Cadence Bank, N.A. | Notes Payable to Banks |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 1,100,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 1.00% |  |  |  |  |
Secured term note payable - related party |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 20,500,000
Debt instrument, collateral amount |  |  |  |  |  |  |  |  |  | $ 20,000,000.0
Number of installments | Installment |  | 8 |  |  |  |  |  |  |  |
Secured term note payable - related party | Former Executive Chairman of Board of Directors of American Electric Technologies Inc | M&I Brazil | Loan Agreement |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 10.00% |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 300,000 |  |
Loan facility drawn and outstanding |  |  |  | $ 200,000 |  |  |  |  |  |
Secured term note payable - related party | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate basis (as a percent) |  |  | 3.15% |  |  |  |  |  | 3.00% |
Secured promissory note - related party | M/G Finance Co., Ltd. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 5,000,000.0 |  |  |
Secured promissory note - related party | Secured Debt | M/G Finance Co., Ltd. |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | 5,000,000 |  |  |
Certain pieces of equipment for secured debt |  |  |  |  |  |  | $ 5,000,000 |  |  |
Secured promissory note - related party | Secured Debt | M/G Finance Co., Ltd. | To December 10, 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 6.00% |  |  |
Secured promissory note - related party | Secured Debt | M/G Finance Co., Ltd. | December 11, 2020 and Thereafter |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 12.00% |  |  |
2019 to 2020 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance notes interest rate (as a percent) |  |  | 6.20% |  |  |  |  |  |  |
2020 to 2021 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Insurance notes interest rate (as a percent) |  |  | 5.45% |  |  |  |  |  |  |

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