Organization and Summary of Significant Accounting Policies, Warranties and Indemnifications (Details)	12 Months Ended
	Dec. 31, 2017
End-User Software Products [Member]
Product Warranty Liability [Line Items]
Refund period	30 days
Partnerships [Member] | Minimum [Member]
Product Warranty Liability [Line Items]
Refund period	5 days
Partnerships [Member] | Maximum [Member]
Product Warranty Liability [Line Items]
Refund period	14 days
Referral Programs and Direct Transactions [Member]
Product Warranty Liability [Line Items]
Refund period	5 days