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Stock-based Compensation - Restricted Stock Unit Activity (Details) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) $ / shares shares
Weighted-Average Grant Date Fair Value
Unrecognized compensation expense recognition period	2 years 6 months
Restricted Stock Units
Shares
Beginning Balance (in shares)	452,500
Granted (in shares)	15,000
Exercised (in shares)	(210,950)
Forfeited or expired (in shares)	(40,950)
Ending Balance (in shares)	215,600
Weighted-Average Grant Date Fair Value
Beginning Balance (in dollars per share) | $ / shares	$ 15.32
Granted (in dollars per share) | $ / shares	23.68
Exercised (in dollars per share) | $ / shares	15.32
Forfeited or expired (in dollars per share) | $ / shares	15.32
Ending Balance (in dollars per share) | $ / shares	$ 15.90
Awards granted in period (in shares)	15,000
Total unrecognized compensation cost | $	$ 2.8
Unrecognized compensation expense recognition period	1 year

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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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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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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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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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Number of non-option equity instruments exercised by participants.

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