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Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Net of allowance for doubtful accounts (in Dollars) | $ 4,796 | $ 5,047 | $ 5,537
Convertible redeemable preferred shares, issued |  |  | 99,028,297
Common stock, par share (in Dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001
Common stock, shares authorized | 750,000,000 | 240,450,000 | 240,450,000
Common stock, shares issued | 300,522,394 | 99,028,297 | 99,028,297
Common stock, shares outstanding | 298,834,894 | 99,028,297 | 99,028,297
Series C1 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  | 26,757,258 | 26,757,258
Convertible redeemable preferred shares, issued |  | 26,757,258 | 26,757,258
Convertible redeemable preferred shares, outstanding |  | 26,757,258 | 26,757,258
Series C2 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  | 20,249,450 | 20,249,450
Convertible redeemable preferred shares, issued |  | 20,249,450 | 20,249,450
Convertible redeemable preferred shares, outstanding |  | 20,249,450 | 20,249,450
Series D1 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  | 22,311,516 | 22,311,516
Convertible redeemable preferred shares, issued |  | 22,311,516 | 22,311,516
Convertible redeemable preferred shares, outstanding |  | 22,311,516 | 22,311,516

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