Significant Accounting Policies, Revenue Recognition (Details) - Type	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Deferred Revenue Arrangement [Line Items]
Number of types of offerings			4
Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Payment terms for arrangements to be considered fixed or determinable			90 days
Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Services breakage revenue	1.00%	1.00%	1.00%	1.00%
End-User Software Products [Member]
Deferred Revenue Arrangement [Line Items]
Refund period			30 days
Partnerships [Member] | Minimum [Member]
Deferred Revenue Arrangement [Line Items]
Refund period			5 days
Partnerships [Member] | Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Refund period			14 days
Referral Programs and Direct Transactions [Member]
Deferred Revenue Arrangement [Line Items]
Refund period			5 days