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Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001

X

- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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