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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%

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- Definition Redemption value, as if currently redeemable, of redeemable noncontrolling interest for preferred shares, units or ownership interests classified as temporary equity and the election has been made to accrete changes in redemption value to the earliest redemption date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 24(b) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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