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Stock-based Compensation - Restricted Stock Unit Activity (Details) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) $ / shares shares
Weighted-Average Grant Date Fair Value
Unrecognized compensation expense recognition period	2 years 10 months 24 days
Restricted Stock Units
Shares
Beginning Balance (in shares)	209,250
Granted (in shares)	0
Exercised (in shares)	0
Forfeited or expired (in shares)	(5,150)
Ending Balance (in shares)	204,100
Weighted-Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 15.92
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	0
Forfeited or expired (in dollars per share) | $ / shares	15.32
Ending Balance (in dollars per share) | $ / shares	$ 15.93
Awards granted in period (in shares)	0
Total unrecognized compensation cost | $	$ 1.2
Unrecognized compensation expense recognition period	6 months

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- Definition

Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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

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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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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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Number of non-option equity instruments exercised by participants.

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