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Long term obligations (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Jul. 28, 2016
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]          
Proceeds from Long-term Capital Lease Obligations     $ 0 $ 859 $ 0
MediaMiser [Member]          
Debt Instrument [Line Items]          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable     587    
Business Combination, Contingent Consideration, Liability     500    
MediaMiser [Member] | Scenario, Forecast [Member]          
Debt Instrument [Line Items]          
Business Combination, Contingent Consideration, Liability, Current $ 4,600        
Vendor Agreement [Member]          
Debt Instrument [Line Items]          
License Costs   $ 400      
Sale Leaseback Agreement [Member]          
Debt Instrument [Line Items]          
Capital Lease Obligations Lease Period   36 months      
Sale Leaseback Transaction, Imputed Interest Rate   6.00%      
Proceeds from Long-term Capital Lease Obligations   $ 900      
Sale Leaseback Transaction, Rent Expense     $ 600    
Subsequent Event [Member] | MediaMiser [Member]          
Debt Instrument [Line Items]          
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable $ 500