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Segment Reporting - Summary of Segmented Data (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Segment Reporting Information [Line Items]
Revenue from external customers		$ 1,085	$ 942	$ 3,226	$ 7,618
Intersegment revenues
Segment gross profit		629	524	1,837	2,937
Depreciation and amortization		18	19	58	122
Segment loss before income taxes		(208)	(265)	(631)	(899)
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		813	794	2,525	2,057
Intersegment revenues
Segment gross profit		511	438	1,529	1,023
Depreciation and amortization		13	16	45	48
Segment loss before income taxes		(108)	(243)	(382)	(893)
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		272	148	701	487
Intersegment revenues
Segment gross profit		118	86	308	283
Depreciation and amortization		5	3	13	11
Segment loss before income taxes		(100)	(22)	(249)	(78)
Energy & Security Sonar Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]				4,620
Intersegment revenues	[1]
Segment gross profit	[1]				1,517
Depreciation and amortization	[1]				53
Segment loss before income taxes	[1]				82
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]				454
Intersegment revenues	[1]
Segment gross profit	[1]				114
Depreciation and amortization	[1]				10
Segment loss before income taxes	[1]				$ (10)
[1] Acorn ceased consolidating the results of DSIT following the close of the sale of a portion of Acorn's interest in DSIT on April 21, 2016. Accordingly, there are no results for the periods ending September 30, 2017.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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