Employee Benefit Plan (Details) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
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| Postemployment Benefits [Abstract] | |||
| Company's matching contribution percent | 25.00% | ||
| Percent of participant's compensation | 6.00% | ||
| Matching contribution costs to the Plan | $ 0.7 | $ 1.1 | $ 4.0 |
| Vesting percentage for employees hired prior to July 2017 | 100.00% | ||
| Vesting period for employees hired after July 2017 | 3 years | ||
| X | ||||||||||
- Definition Defined Contribution Plan, Vesting Percentage For Employees Hired Prior to July 2017 No definition available.
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| X | ||||||||||
- Definition Defined Contribution Plans, Vesting Period For Employees Hired After July 2017 No definition available.
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| X | ||||||||||
- Definition Amount of cost for defined contribution plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. No definition available.
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| X | ||||||||||
- Definition Percentage employer matches of the employee's percentage contribution matched. No definition available.
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| X | ||||||||||
- References No definition available.
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