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Segment Reporting - Summary of Segmented Data (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenue from external customers		$ 1,045	$ 1,915	$ 2,141	$ 6,676
Intersegment revenues
Segment gross profit		594	782	1,208	2,413
Depreciation and amortization		20	32	40	103
Segment income (loss) before income taxes		(214)	(503)	(423)	(701)
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		814	596	1,712	1,263
Intersegment revenues
Segment gross profit		498	252	1,018	585
Depreciation and amortization		16	16	32	32
Segment income (loss) before income taxes		(129)	(473)	(274)	(712)
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		231	165	429	339
Intersegment revenues
Segment gross profit		96	105	190	197
Depreciation and amortization		4	4	8	8
Segment income (loss) before income taxes		(85)	(48)	(149)	(61)
Energy & Security Sonar Systems [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]		1,038		4,620
Intersegment revenues	[1]
Segment gross profit	[1]		384		1,517
Depreciation and amortization	[1]		10		53
Segment income (loss) before income taxes	[1]		15		82
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]		116		454
Intersegment revenues	[1]
Segment gross profit	[1]		41		114
Depreciation and amortization	[1]		2		10
Segment income (loss) before income taxes	[1]		$ 3		$ (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 June 30, 2017.

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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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