Share-based Compensation Plans - Additional Information (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($) plan shares	Mar. 31, 2019 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans in effect \| plan	2
Performance-based liability awards, measurement period (in years)	3 years
Share-based compensation expenses \| $	$ 1.1	$ 1.0
Compensation expense (benefit) related to cash awards \| $	(0.3)	(0.3)
Total unrecognized compensation expense \| $	$ 9.2
Total unrecognized compensation expense, weighted average period of recognition	2 years 3 months 18 days
2012 Omnibus Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	3,500,000
Number of shares terminated (in shares)	157,811
2019 Omnibus Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for issuance (in shares)	2,800,000
Number of shares terminated (in shares)	276,753
Inducement Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized for grant (in shares)	6,000,000.0
Number of shares available for issuance (in shares)	5,000,000.0
Number of shares terminated (in shares)	145,952
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service based restricted stock, shares granted (in shares)	211,769
Share-based compensation expenses \| $	$ 0.8	0.8
Restricted stock \| Trustee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service based restricted stock, vesting period (in years)	1 year
Restricted stock \| Minimum \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service based restricted stock, vesting period (in years)	3 years
Restricted stock \| Maximum \| Employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service based restricted stock, vesting period (in years)	5 years
Equity Award
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation expenses \| $	$ 0.6	$ 0.5

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Share Based Compensation Arrangement by Share Based Payment Award, Performance Period

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of shares authorized for issuance under share-based payment arrangement.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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