Quarterly report pursuant to Section 13 or 15(d)

Acquisitions of Assets - eTab and Cumulus (Details)

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Acquisitions of Assets - eTab and Cumulus (Details) - USD ($)
$ in Millions
1 Months Ended
Jan. 31, 2019
Feb. 28, 2019
Schedule of Asset Acquisition [Line Items]    
Redeemable noncontrolling interest, equity, preferred, redemption value   $ 4.5
President, Chief Executive Officer And Chairman    
Schedule of Asset Acquisition [Line Items]    
Percentage of ownership before transaction 80.00%  
Preferred stock, percentage owned   83.30%