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Sale of Subsidiary and Assets - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 07, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Net foreign currency remeasurement gain/loss   $ 0 $ 0 $ 0 $ 1,215
Rapid! Paycard          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Proceeds from sale of subsidiary $ 20,000        
Net foreign currency remeasurement gain/loss $ 1,215