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Segment reporting and concentrations (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]                      
Revenues $ 15,523 $ 15,135 $ 14,063 $ 13,802 $ 15,892 $ 14,804 $ 14,314 $ 14,066 $ 58,523 $ 59,076 $ 64,249
Assets 51,237       54,861       51,237 54,861  
Goodwill 1,476       1,635       1,476 1,635 675
Before Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [1]                 (2,181) (1,520) (7,384)
After Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [2]                 (2,181) (1,520) (7,384)
Content Services [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 51,721 56,794 63,102
Assets 41,842       46,681       41,842 46,681  
Goodwill 675       675       675 675  
Content Services [Member] | Before Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [1]                 5,225 6,356 6,212
Content Services [Member] | After Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [2]                 2,712 4,363 4,392
IADS [Member]                      
Segment Reporting Information [Line Items]                      
Revenues                 2,111 614 1,147
Assets 1,026       540       1,026 540  
IADS [Member] | Before Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [1]                 (6,176) (7,572) (13,596)
IADS [Member] | After Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [2]                 (3,685) (5,582) (11,776)
MIS [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes                 4,691 1,668 0
Assets 8,369       7,640       8,369 7,640  
Goodwill $ 801       $ 960       801 960  
MIS [Member] | Before Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [1]                 (1,230) (304) 0
MIS [Member] | After Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Income (loss) before provision for income taxes [2]                 $ (1,208) $ (301) $ 0
[1] Before elimination of any inter-segment profits
[2] After elimination of any inter-segment profits