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Unaudited Condensed Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Net of allowance for doubtful accounts (in Dollars) | $ 5,354 | $ 5,005 | $ 5,047
Common stock, par value (in Dollars per share) | $ 0.0001 | $ 0.0001 | $ 0.0001
Common stock, shares authorized | 750,000,000 | 750,000,000 | 240,450,000
Common stock, shares issued | 300,538,640 | 300,530,516 | 99,028,297
Common stock, shares outstanding | 298,851,140 | 298,843,016 | 99,028,297
Series C1 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) |  | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  |  | 26,757,258
Convertible redeemable preferred shares, issued |  |  | 26,757,258
Convertible redeemable preferred shares, outstanding |  |  | 26,757,258
Series C2 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) |  | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  |  | 20,249,450
Convertible redeemable preferred shares, issued |  |  | 20,249,450
Convertible redeemable preferred shares, outstanding |  |  | 20,249,450
Series D1 Convertible Redeemable Preferred Shares |  |  |
Convertible redeemable preferred shares, par value (in Dollars per share) |  | $ 0.0001 | $ 0.0001
Convertible redeemable preferred shares, authorized |  |  | 22,311,516
Convertible redeemable preferred shares, issued |  |  | 22,311,516
Convertible redeemable preferred shares, outstanding |  |  | 22,311,516

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