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Stock Incentive Plans - Stock Awards Activity (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Unvested restricted common stock
Number of Shares
Beginning Balance (in shares)	557,273
Granted (in shares)	1,177,537
Vested (in shares)	(236,288)
Forfeited (in shares)	(47,025)
Ending Balance (in shares)	1,451,497
Weighted- Average Grant Date Fair Value
Balance (in dollars per share)	$ 9.46	$ 9.83
Granted (in dollars per share)	9.32
Vested (in dollars per share)	9.93
Forfeited (in dollars per share)	$ 9.21
Shares related to unvested PSUs
Number of Shares
Beginning Balance (in shares)	912,186
Granted (in shares)	347,981
Vested (in shares)	(290,927)
Ending Balance (in shares)	969,240
Weighted- Average Grant Date Fair Value
Balance (in dollars per share)	$ 9.45	9.63
Granted (in dollars per share)	9.34
Vested (in dollars per share)	$ 9.90
Vesting percentage	100.00%
Long-Term Incentive Plan Unit
Number of Shares
Beginning Balance (in shares)	243,809
Vested (in shares)	(108,421)
Ending Balance (in shares)	135,388
Weighted- Average Grant Date Fair Value
Balance (in dollars per share)	$ 10.22	$ 10.29
Vested (in dollars per share)	$ 10.38

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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