Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands, shares in Millions	Jun. 30, 2021	Dec. 31, 2020
Current assets
Allowances for receivables	$ 90	$ 98
Class A Common Stock [Member]
Stockholders' equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750.0	750.0
Common stock, shares issued (in shares)	206.7	174.6
Shares outstanding (in shares)	206.7	174.6

Amount of allowance for credit loss on accounts receivable, classified as current.

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