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Acquisition of Mercent Corporation (Details) - USD ($)
6 Months Ended
Jan. 08, 2015
Jun. 30, 2016
Jun. 30, 2015
Business Acquisition [Line Items]      
Cash consideration   $ 0 $ 20,225,000
Mercent      
Business Acquisition [Line Items]      
Percentage of voting interests acquired 100.00%    
Cash consideration $ 20,200,000    
Transaction related costs   $ 0 $ 166,000
Goodwill not deductible for tax purposes $ 0