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Stock Incentive Plans - Stock Awards Activity (Details)
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Unvested restricted common stock  
Number of Shares  
Beginning Balance (in shares) | shares 557,273
Granted (in shares) | shares 1,114,894
Vested (in shares) | shares (236,288)
Ending Balance (in shares) | shares 1,435,879
Weighted- Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 9.83
Granted (in dollars per share) | $ / shares 9.40
Vested (in dollars per share) | $ / shares 9.93
Ending balance (in dollars per share) | $ / shares $ 9.48
Shares related to unvested PSUs  
Number of Shares  
Beginning Balance (in shares) | shares 912,186
Granted (in shares) | shares 347,981
Vested (in shares) | shares (290,927)
Ending Balance (in shares) | shares 969,240
Weighted- Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 9.63
Granted (in dollars per share) | $ / shares 9.34
Vested (in dollars per share) | $ / shares 9.90
Ending balance (in dollars per share) | $ / shares $ 9.45
Vesting percentage 100.00%
Long-Term Incentive Plan Unit  
Number of Shares  
Beginning Balance (in shares) | shares 243,809
Vested (in shares) | shares (108,421)
Ending Balance (in shares) | shares 135,388
Weighted- Average Grant Date Fair Value  
Beginning balance (in dollars per share) | $ / shares $ 10.29
Vested (in dollars per share) | $ / shares 10.38
Ending balance (in dollars per share) | $ / shares $ 10.22