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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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