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Segment Reporting and Geographic Information - Summary of Segmented Data (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue from external customers		$ 8,659	$ 16,548
Intersegment revenues
Segment gross profit		3,525	6,167
Depreciation and amortization		143	297
Segment income (loss) before income taxes		(1,128)	(1,528)
Segment assets		2,552	18,206
Expenditures for segment assets		33	132
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		2,903	2,513
Intersegment revenues
Segment gross profit		1,516	1,472
Depreciation and amortization		65	70
Segment income (loss) before income taxes		(848)	(1,437)
Segment assets		1,673	1,691
Expenditures for segment assets
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		682	534
Intersegment revenues
Segment gross profit		378	319
Depreciation and amortization		15	15
Segment income (loss) before income taxes		(352)	(116)
Segment assets		879	298
Expenditures for segment assets
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]	4,620	12,093
Intersegment revenues	[1]
Segment gross profit	[1]	1,517	3,834
Depreciation and amortization	[1]	53	185
Segment income (loss) before income taxes	[1]	82	(195)
Segment assets	[1]		15,777
Expenditures for segment assets	[1]	30	114
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]	454	1,408
Intersegment revenues	[1]
Segment gross profit	[1]	114	542
Depreciation and amortization	[1]	10	27
Segment income (loss) before income taxes	[1]	(10)	220
Segment assets	[1]		440
Expenditures for segment assets	[1]	$ 3	$ 18
[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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