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ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS - Consolidating Balance Sheets Additional Information (Details) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS [Line Items]
Preferred Stock, Par or Stated Value Per Share	$ 0.003	$ 0.003
Preferred Stock, Shares Authorized	1,666,667	1,666,667
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Class A Ordinary Shares [Member]
ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.003	$ 0.003
Ordinary shares, shares authorized	66,666,667	66,666,667
Ordinary shares, shares issued	41,923,276	38,858,199
Ordinary shares, shares outstanding	41,923,276	38,858,199
Class C Ordinary Shares [Member]
ADDITIONAL INFORMATION - CONDENSED FINANCIAL STATEMENTS [Line Items]
Ordinary shares, par value (in dollars per share)	$ 0.003	$ 0.003
Ordinary shares, shares authorized	8,333,333	8,333,333
Ordinary shares, shares issued	4,708,415	4,708,415
Ordinary shares, shares outstanding	4,708,415	4,708,415

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

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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.

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