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Segment Reporting - Summary of Segmented Data (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Revenue from external customers		$ 1,096	$ 4,761
Intersegment revenues
Segment gross profit		614	1,631
Depreciation and amortization		20	71
Segment income (loss) before income taxes		(209)	(198)
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		898	667
Intersegment revenues
Segment gross profit		520	333
Depreciation and amortization		16	16
Segment income (loss) before income taxes		(145)	(239)
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		198	174
Intersegment revenues
Segment gross profit		94	92
Depreciation and amortization		4	4
Segment income (loss) before income taxes		(64)	(13)
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers			3,582
Intersegment revenues
Segment gross profit			1,133
Depreciation and amortization			43
Segment income (loss) before income taxes			67
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]		338
Intersegment revenues	[1]
Segment gross profit			73
Depreciation and amortization	[1]		8
Segment income (loss) before income taxes	[1]		$ (13)
[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 period ending March 31, 2017.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ 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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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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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