Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Revenue Sources (Details)

v3.19.3
Summary of Significant Accounting Policies - Revenue Sources (Details) - Sales Revenue, Net
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Fox Networks Group        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage 55.00% 60.00% 58.00% 39.00%
Fetch Media, Ltd.        
Revenue, Major Customer [Line Items]        
Concentration risk, percentage 0.00% 0.00% 0.00% 26.00%