Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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-Publisher FASB
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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash paid related to share-based compensation liabilities.

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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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No definition available.

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- Definition

Net number of non-option equity instruments granted to participants.

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Percentage of vesting of share-based compensation awards.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stock-Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended
	Oct. 31, 2017	Aug. 31, 2017	Feb. 28, 2017	Mar. 31, 2018	Mar. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expenses				$ 450	$ 178
Unrecognized stock-based compensation cost				$ 3,000
Unrecognized stock-based compensation cost, recognition period				2 years
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards vesting periods				3 years
Share-based compensation, liability paid				$ 107
Restricted Stock Units (RSUs) \| Employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs or SARs granted			612,000
Restricted Stock Units (RSUs) \| Chairman of the Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs or SARs granted		100,000
Restricted Stock Units (RSUs) \| Internal General Counsel
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs or SARs granted	28,409
Restricted Stock Units (RSUs) \| Vesting on First Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage				40.00%
Restricted Stock Units (RSUs) \| Vesting on Second Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage				30.00%
Restricted Stock Units (RSUs) \| Vesting on Third Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage				30.00%
Stock Appreciation Rights (SARs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs or SARs granted			700,000
Awards vesting periods			3 years
Share-based compensation, liability paid				$ 442
Share-based compensation expiration period			5 years
Stock Appreciation Rights (SARs) \| Vesting on First Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage			40.00%
Stock Appreciation Rights (SARs) \| Vesting on Second Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage			30.00%
Stock Appreciation Rights (SARs) \| Vesting on Third Anniversary
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award vesting rights, Percentage			30.00%