Segment Reporting - Summary of Segmented Data (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenue from external customers		$ 942	$ 4,402	$ 7,618	$ 12,217
Intersegment revenues
Segment gross profit		524	1,823	2,937	4,734
Depreciation and amortization		19	74	122	221
Segment net income (loss) before income taxes		(265)	(46)	(899)	(937)
PG [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		794	661	2,057	1,774
Intersegment revenues
Segment gross profit		438	401	1,023	1,035
Depreciation and amortization		16	18	48	53
Segment net income (loss) before income taxes		(243)	(431)	(893)	(1,131)
CP [Member]
Segment Reporting Information [Line Items]
Revenue from external customers		148	126	487	376
Intersegment revenues
Segment gross profit		86	34	283	216
Depreciation and amortization		3	3	11	11
Segment net income (loss) before income taxes		(22)	(6)	(78)	(130)
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]		3,277	4,620	9,025
Intersegment revenues	[1]
Segment gross profit	[1]		1,258	1,517	3,048
Depreciation and amortization	[1]		47	53	137
Segment net income (loss) before income taxes	[1]		336	82	132
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	[1]		338	454	1,042
Intersegment revenues	[1]
Segment gross profit	[1]		130	114	435
Depreciation and amortization	[1]		6	10	20
Segment net income (loss) before income taxes	[1]		$ 55	$ (10)	$ 192

[1] Results for the nine months ended September 30, 2016, only include results for the period January 1, 2016 to April 21, 2016. See Note 3.