Equity and Share-Based Compensation - Chief Executive Officer Restricted Stock Units Containing a Market Condition (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
Nov. 01, 2017	Mar. 31, 2018
Maximum
Share-Based Compensation
Percentage of vesting of RSUs granted (as a percentage)	120.00%
Restricted Stock Units with Market Condition \| Chief Executive Officer
Share-Based Compensation
RSUs granted based on actual TSR (as a percentage)	50.00%
RSUs granted based on relative TSR (as a percentage)	50.00%
Assumptions used to estimate fair value of restricted stock unit awards with market condition
Unrecognized expense for share-based compensation		$ 1.3
Weighted-average period for over which unrecognized expense will be recognized		2 years 7 months 6 days
Restricted Stock Units with Market Condition \| Executive officer
Assumptions used to estimate fair value of restricted stock unit awards with market condition
Risk-free interest rate (as a percent)		2.34%
Expected volatility rate, minimum (as a percent)		40.00%
Expected volatility rate, maximum (as a percent)		127.20%
Calculated fair value per stock option (in dollars per share)		$ 13.34
Service period (in years)		3 years
Unrecognized expense for share-based compensation		$ 1.2
Weighted-average period for over which unrecognized expense will be recognized		2 years 9 months 18 days
Restricted Stock
Granted (in shares)		96,305
Non-vested shares outstanding at the end of the period (in shares)		96,305
Weighted Average Grant Date Fair Value
Granted (in dollars per share)		$ 13.34
Non-vested shares outstanding at the end of the period (in dollars per share)		$ 13.34
First 50% of RSUs granted based on actual TSR \| Chief Executive Officer
Share-Based Compensation
Days considered for calculation of average stock price	20 days
Remaining 50% of RSUs granted based on relative TSR \| Executive officer \| Top 35% or better Relative TSR to Peer Group
Share-Based Compensation
Percentage of vesting of RSUs granted (as a percentage)		150.00%
Remaining 50% of RSUs granted based on relative TSR \| Executive officer \| Top 50% or better Relative TSR to Peer Group
Share-Based Compensation
Percentage of vesting of RSUs granted (as a percentage)		100.00%
Remaining 50% of RSUs granted based on relative TSR \| Executive officer \| Top 60% or better Relative TSR to Peer Group
Share-Based Compensation
Percentage of vesting of RSUs granted (as a percentage)		50.00%
Remaining 50% of RSUs granted based on relative TSR \| Executive officer \| Less than 60% of Relative TSR to Peer Group
Share-Based Compensation
Percentage of vesting of RSUs granted (as a percentage)		0.00%
General and administrative expense \| Restricted Stock Units with Market Condition \| Chief Executive Officer
Assumptions used to estimate fair value of restricted stock unit awards with market condition
Share-based compensation costs recognized		$ 0.1
General and administrative expense \| Restricted Stock Units with Market Condition \| Executive officer
Assumptions used to estimate fair value of restricted stock unit awards with market condition
Share-based compensation costs recognized		$ 0.1

The number days considered for calculation of average stock price.

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The percentage of restricted stock units granted based on company's cumulative total shareholder return.

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The percentage of restricted stock units granted based on company's relative total shareholder return.

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- Definition

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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Unrecognized cost of unvested share-based compensation awards.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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- Definition

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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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Price of a single share of a number of saleable stocks of a company.

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Percentage of vesting of share-based compensation awards.

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