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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT (Parenthetical) - Restricted stock awards - shares
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Number of shares granted to employees and directors 4,325,124 4,990,971 3,140,168
Common Stock      
Number of shares granted to employees and directors 4,325,124 4,990,971 3,140,168