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Segment reporting and concentrations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Jul. 28, 2014
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ 15,674 | $ 16,060 | $ 15,642 | $ 15,698 | $ 15,523 | $ 15,135 | $ 14,063 | $ 13,802 | $ 63,074 | $ 58,523 | $ 59,076 |
Income (loss) before provision for income taxes |  |  |  |  |  |  |  |  |  | (4,785) | (2,181) | (1,520) |
Assets |  | 47,588 |  |  |  | 51,237 |  |  |  | 47,588 | 51,237 |  |
Goodwill |  | 2,734 |  |  |  | 1,476 |  |  |  | 2,734 | 1,476 | 1,635 | $ 1,034
Before Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [1] |  |  |  |  |  |  |  |  | (4,785) | (2,181) | (1,520) |
After Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [2] |  |  |  |  |  |  |  |  | (4,785) | (2,181) | (1,520) |
IADS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 4,347 | 2,111 | 614 |
Assets |  | 1,282 |  |  |  | 1,026 |  |  |  | 1,282 | 1,026 |  |
IADS [Member] | Before Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [1] |  |  |  |  |  |  |  |  | (4,664) | (6,176) | (7,572) |
IADS [Member] | After Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [2] |  |  |  |  |  |  |  |  | (1,778) | (3,685) | (5,582) |
MIS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes |  |  |  |  |  |  |  |  |  | 8,088 | 4,691 | 1,668 |
Assets |  | 21,874 |  |  |  | 8,369 |  |  |  | 21,874 | 8,369 |  |
Goodwill |  | 2,059 |  |  |  | 801 |  |  |  | 2,059 | 801 |  |
MIS [Member] | Before Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [1] |  |  |  |  |  |  |  |  | (1,258) | (1,230) | (304) |
MIS [Member] | After Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [2] |  |  |  |  |  |  |  |  | (1,231) | (1,208) | (301) |
DDS [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 50,639 | 51,721 | 56,794 |
Assets |  | 24,432 |  |  |  | 41,842 |  |  |  | 24,432 | 41,842 |  |
Goodwill |  | $ 675 |  |  |  | $ 675 |  |  |  | 675 | 675 |  |
DDS [Member] | Before Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [1] |  |  |  |  |  |  |  |  | 1,137 | 5,225 | 6,356 |
DDS [Member] | After Intersegment Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before provision for income taxes | [2] |  |  |  |  |  |  |  |  | $ (1,776) | $ 2,712 | $ 4,363 |
[1] | Before elimination of any inter-segment profits
[2] | After elimination of any inter-segment profits

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