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Stock Incentive Plans - Summary of Nonvested RSUs (Details) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares, Outstanding, Beginning balance 620,277,000    
Shares, Vested (620,277,000)    
Shares, Outstanding, Ending balance   620,277,000  
Weighted-Average Grant Date Fair Value, Outstanding, Beginning balance $ 1.29    
Weighted-Average Grant Date Fair Value, Granted 1.29 $ 1.39 $ 2.42
Weighted-Average Grant Date Fair Value, Vested $ 1.29    
Weighted-Average Grant Date Fair Value, Outstanding, Ending balance   $ 1.29