The Company and Summary of Significant Accounting Policies - Concentration Risks (Details) - Customer Concentration Risk [Member]	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenues from customers | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers	52.70%	51.70%	52.20%
Revenues from customers | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers	27.60%	27.40%	24.80%
Accounts Receivable | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers	43.90%	31.40%
Accounts Receivable | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers	22.30%	19.20%
Accounts Receivable | Ad Colony
Concentration Risk [Line Items]
Concentration risk percentage from customers	10.80%	26.20%
Accounts Receivable | Fyber
Concentration Risk [Line Items]
Concentration risk percentage from customers	10.50%