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Debt - Additional Information (Detail)					9 Months Ended
	Aug. 30, 2019 USD ($) day shares	Nov. 30, 2018 USD ($)	Aug. 21, 2017 USD ($) Installment	Sep. 30, 2013 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Aug. 16, 2019 USD ($)	Jul. 26, 2019 USD ($)	Dec. 31, 2018 USD ($)
Debt Instrument [Line Items]
Convertible debt, exchanged	$ 7,000,000	$ 48,700,000			$ 7,000,000	$ 0
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				116,000	$ 0
Certain pieces of equipment for secured debt					62,617,000				$ 66,606,000
Annual commercial insurance premiums					500,000
Outstanding principal amount of premium financed					$ 500,000				100,000
Insurance terms					10 months
Short-term financing					$ 831,000				$ 121,000
Santander Bank
Debt Instrument [Line Items]
Interest rate					11.88%
Short-term financing					$ 200,000
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
Senior Secured Term Note
Debt Instrument [Line Items]
Debt instrument, face amount				$ 20,500,000
Debt instrument, collateral amount				$ 20,000,000
Number of installments | Installment			8
Senior Secured Term Note | Former Executive Chairman of Board of Directors of American Electric Technologies Inc | M&I Brazil | Loan Agreement
Debt Instrument [Line Items]
Interest rate								10.00%
Line of credit facility, maximum borrowing capacity								$ 300,000
Loan facility drawn and outstanding					$ 200,000
Senior Secured Term Note | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, interest rate basis				3.00%
Secured Promissory Note | M/G Finance Co., Ltd.
Debt Instrument [Line Items]
Debt instrument, face amount							$ 5,000,000
Secured Promissory Note | M/G Finance Co., Ltd. | Secured Debt
Debt Instrument [Line Items]
Debt instrument, face amount							5,000,000
Certain pieces of equipment for secured debt							$ 5,000,000
Secured Promissory Note | M/G Finance Co., Ltd. | Secured Debt | To December 10, 2020
Debt Instrument [Line Items]
Interest rate							6.00%
Secured Promissory Note | M/G Finance Co., Ltd. | Secured Debt | December 11, 2020 and Thereafter
Debt Instrument [Line Items]
Interest rate							12.00%
2018 to 2019
Debt Instrument [Line Items]
Insurance notes interest rate					5.40%
2019 to 2020
Debt Instrument [Line Items]
Insurance notes interest rate					6.20%

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