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Stock-Based Compensation - Summary of Unvested PSU Award Activity (Details) - Performance Share Units
12 Months Ended
Dec. 31, 2020
$ / shares
shares
Shares  
Beginning period (in shares) | shares 835,625
Shares granted (in shares) | shares 1,043,800
End period (in shares) | shares 1,879,425
Weighted-Average Grant Date Fair Value  
Beginning of period (in dollars per share) | $ / shares $ 10.51
Granted (in dollars per share) | $ / shares 5.36
End of period (in dollars per share) | $ / shares $ 7.65