Unaudited Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Class A Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0003	$ 0.0003	$ 0.0003
Common Stock, Shares Authorized	400,000,000	400,000,000	400,000,000
Common Stock, Shares, Issued	185,685,853	185,257,423	184,667,304
Common Stock, Shares, Outstanding	185,685,853	185,257,423	184,667,304
Class B Convertible Common Stock [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0003	$ 0.0003	$ 0.0003
Common Stock, Shares Authorized	34,450,000	34,450,000	34,450,000
Common Stock, Shares, Issued	34,450,000	34,450,000	34,450,000
Common Stock, Shares, Outstanding	34,450,000	34,450,000	34,450,000
Common Class C [Member]
Common Stock, Par or Stated Value Per Share	$ 0.0003	$ 0.0003	$ 0.0003
Common Stock, Shares Authorized	400,000,000	400,000,000	400,000,000
Common Stock, Shares, Issued	223,905,097	222,375,079	221,148,991
Common Stock, Shares, Outstanding	223,905,097	222,375,079	221,148,991

Face amount or stated value per share of common stock.

Name:	us-gaap_CommonStockParOrStatedValuePerShare
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

+ References

+ Details

Name:	us-gaap_CommonStockSharesAuthorized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

+ References

+ Details

Name:	us-gaap_CommonStockSharesIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

+ Details

Name:	us-gaap_CommonStockSharesOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_ConvertibleCommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: