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Segment reporting and concentrations (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Revenues:    
Revenues $ 86,591 $ 73,942
Income (loss) before provision for income taxes:    
Income (loss) before provision for income taxes 6,839 5,271
Total assets:    
Assets 66,181 59,397
Content Services [Member]
    
Revenues:    
Revenues 85,386 73,942
Income (loss) before provision for income taxes:    
Income (loss) before provision for income taxes 14,775 8,038
Total assets:    
Assets 61,858 57,280
IADS [Member]
    
Revenues:    
Revenues 1,205 0
Income (loss) before provision for income taxes:    
Income (loss) before provision for income taxes (7,936) [1] (2,767) [1]
Total assets:    
Assets $ 4,323 $ 2,117
[1] Before elimination of any inter-segment profits.