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Stock-Based Compensation - Summary of Restricted Stock and Restricted Stock Unit Activity (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Restricted Share Awards    
Number of Restricted Stock Awards    
Unvested, Beginning Balance (in shares) 4,496,045 1,659,759
Granted (in shares) 2,820,259 4,026,518
Share issuance upon approved achievement date (in shares) (2,272,064) (753,475)
Forfeited (in shares) (608,233) (436,757)
Unvested, Ending Balance (in shares) 4,436,007 4,496,045
Weighted Average Fair Value per Share at Grant Date    
Beginning Balance (in dollars per share) $ 4.29 $ 11.67
Granted (in dollars per share) 3.33 2.68
Share issuance upon approved achievement date (in dollars per share) 5.06 11.23
Forfeited (in dollars per share) 3.85 6.03
Ending Balance (in dollars per share) $ 3.33 $ 4.29
Restricted Stock Units    
Number of Restricted Stock Awards    
Unvested, Beginning Balance (in shares) 263,524 385,919
Granted (in shares) 2,125 6,800
Market-based achievement adjustment at vesting (in shares) 75,000 (128,334)
Share issuance upon approved achievement date (in shares) (151,386) (861)
Forfeited (in shares) (4,751)  
Unvested, Ending Balance (in shares) 184,512 263,524
Weighted Average Fair Value per Share at Grant Date    
Beginning Balance (in dollars per share) $ 26.39 $ 18.00
Granted (in dollars per share) 3.61 2.36
Market-based achievement adjustment at vesting (in dollars per share) 0 0
Share issuance upon approved achievement date (in dollars per share) 28.09 10.69
Forfeited (in dollars per share) 4.03  
Ending Balance (in dollars per share) $ 23.53 $ 26.39