The Company, Basis of Presentation and Summary of Significant Accounting Policies - Concentration Risks (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenues from customers | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers	55.5	52.6	56.4	52.8
Revenues from customers | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers	32.7	34.6	32.3	34.4
Accounts Receivable | Customer Concentration Risk | Apple
Concentration Risk [Line Items]
Concentration risk percentage from customers			66.1		47.2
Accounts Receivable | Customer Concentration Risk | Google
Concentration Risk [Line Items]
Concentration risk percentage from customers			20.4		28.5
Accounts Receivable | Customer Concentration Risk | Tapjoy
Concentration Risk [Line Items]
Concentration risk percentage from customers					17.8