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Segment Reporting and Geographic Information - Summary of Segmented Data (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue from external customers		$ 4,350	$ 8,659
Intersegment revenues
Segment gross profit		2,447	3,525
Depreciation and amortization		75	146
Segment income (loss) before income taxes		(871)	(1,128)
Segment assets		2,844	2,552
Expenditures for segment assets			33
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		3,355	2,903
Intersegment revenues
Segment gross profit		2,017	1,516
Depreciation and amortization		58	65
Segment income (loss) before income taxes		(531)	(848)
Segment assets		1,398	1,673
Expenditures for segment assets
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		995	682
Intersegment revenues
Segment gross profit		430	378
Depreciation and amortization		17	15
Segment income (loss) before income taxes		(340)	(352)
Segment assets		1,446	879
Expenditures for segment assets
Energy & Security Sonar Solutions [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 income (loss) before income taxes	[1]		82
Segment assets	[1]
Expenditures for segment assets	[1]		30
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 income (loss) before income taxes	[1]		(10)
Segment assets	[1]
Expenditures for segment assets	[1]		$ 3
[1] Results for the year ended December 31, 2016, only include DSIT's results for the period January 1, 2016 to April 21, 2016. See Note 3.

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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)
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
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-Section S99
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