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Capital Transactions - Restricted Stock Units Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Discount for lack of marketability ( as a percent) | 11.90% |  |
Award performance period | 3 years |  |
Expected volatility (as a percent) | 50.00% |  |
Risk free interest rate, minimum | 2.10% |  |
Risk free interest rate, maximum | 2.90% |  |
Share-based compensation expense | $ 100,000 | $ 500,000 |
Unrecognized share-based compensation expense | $ 2,300,000 |  | $ 1,800,000
Weighted-average period over which the remaining compensation expense is expected to be recognized | 1 year 8 months |  |
Minimum statutory withholding requirement paid on behalf of employees (in shares) | 11,000 | 40,000 |
Performance-Based Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation expense | $ 100,000 | $ 0 |
Performance-Based Restricted Stock Units (RSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Potential compensation expense | $ 2,700,000 |  |
2012 Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted (in shares) | 281,000 |  |
2012 Stock Incentive Plan | Restricted Stock Units (RSUs) | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 12 months |  |
2012 Stock Incentive Plan | Restricted Stock Units (RSUs) | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 36 months |  |
2012 Stock Incentive Plan | Time-Based Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Weighted-average grant date fair value (in dollars per share) | $ 8.61 |  |
2012 Stock Incentive Plan | Performance-Based Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Weighted-average grant date fair value (in dollars per share) | $ 4.38 |  |
Director | 2012 Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restriction period | 2 years |  |
Number of shares subject to restriction period | 93,000 |  | 80,000

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