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Segment Reporting and Geographic Information - Summary of Segmented Data (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Revenue from External Customers | $ 19,055 | $ 19,560 |
Intersegment revenues |  |  |
Segment gross profit | $ 6,187 | $ 6,638 |
Impairment of goodwill and intangibles | $ 1,562 | 1,773 |
Restructuring and related charges |  | 294 |
Depreciation and amortization | $ 455 | 646 |
Segment net income (loss) before income taxes | (5,449) | (6,844) |
Segment assets | 19,314 | 19,575 | $ 19,575
Expenditures for segment assets | 137 | 328 |
Energy & Security Sonar Solutions [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from External Customers | $ 12,093 | $ 11,200 |
Intersegment revenues |  |  |
Segment gross profit | $ 3,834 | $ 3,272 |
Impairment of goodwill and intangibles |  |  |
Restructuring and related charges |  |  |
Depreciation and amortization | $ 185 | $ 287 |
Segment net income (loss) before income taxes | (195) | (414) |
Segment assets | 15,777 | 13,367 | 13,367
Expenditures for segment assets | 114 | 278 |
GridSense Segment [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from External Customers | $ 2,507 |  | $ 4,493
Intersegment revenues |  |  |
Segment gross profit | $ 20 |  | $ 1,297
Impairment of goodwill and intangibles | $ 1,562 |  | 1,773
Restructuring and related charges |  |  | 198
Depreciation and amortization | $ 158 |  | 242
Segment net income (loss) before income taxes | (3,921) |  | (4,831)
Segment assets | 1,107 | 3,680 | 3,680
Expenditures for segment assets | 5 |  | 6
M2M [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from External Customers | $ 2,513 | $ 2,174 |
Intersegment revenues |  |  |
Segment gross profit | $ 1,472 | $ 1,182 |
Impairment of goodwill and intangibles |  |  |
Restructuring and related charges |  | $ 76 |
Depreciation and amortization | $ 70 | 69 |
Segment net income (loss) before income taxes | (1,437) | (1,698) |
Segment assets | $ 1,691 | $ 1,663 | 1,663
Expenditures for segment assets |  |  |
Other Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from External Customers | $ 1,942 | $ 1,693 |
Intersegment revenues |  |  |
Segment gross profit | $ 861 | $ 888 |
Impairment of goodwill and intangibles |  |  |
Restructuring and related charges |  | $ 20 |
Depreciation and amortization | $ 42 | 48 |
Segment net income (loss) before income taxes | 104 | 99 |
Segment assets | 739 | 865 | $ 865
Expenditures for segment assets | $ 18 | $ 44 |

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