The Company, Basis of Presentation and Summary of Significant Accounting Policies - Concentration Risks (Details) - Customer Concentration Risk [Member]	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Revenues from customers | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers	52.70%	51.70%	52.90%	52.70%
Revenues from customers | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers	27.10%	26.70%	26.90%	26.70%
Accounts Receivable | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers			35.30%		31.40%
Accounts Receivable | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers			21.90%		19.20%
Accounts Receivable | Ad Colony
Concentration Risk [Line Items]
Concentration risk percentage from customers			23.00%		26.20%