CONSOLIDATED STATEMENT OF STOCKHOLDERS' DEFICIENCY (Parenthetical) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Tax withholdings related to net share settlements of restricted stock units and awards	$ 9,700	$ 6,400	$ 2,400,000	$ 1,600,000
Treasury Stock
Shares withheld for withholding taxes (in shares)	763	756	163,259	127,725
Treasury Stock \| Restricted Stock and Restricted Stock Units \| Class A Common Stock
Share repurchase price (in dollars per share)	$ 12.84	$ 8.50	$ 14.94	$ 12.99

Amount of cash outflow to satisfy grantee's tax withholding obligation for award under share-based payment arrangement.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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