Significant Accounting Policies, Revenue Recognition (Details) - Type	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Deferred Revenue Arrangement [Line Items]
Payment terms for arrangements to be considered fixed or determinable	90 days
Number of types of offerings	3
Maximum [Member]
Deferred Revenue Arrangement [Line Items]
Services breakage revenue	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