Employee Benefit Plan (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Compensation and Retirement Disclosure [Abstract] | |||
| Maximum deferral of pre-tax eligible compensation per terms of plan | 100.00% | ||
| Total expense for matching contribution | $ 1,200,000 | $ 700,000 | $ 0 |
| X | ||||||||||
- Definition Maximum percentage of salary, per terms of the plan up to specified limit, the employee may contribute No definition available.
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| X | ||||||||||
- References No definition available.
|
| X | ||||||||||
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. No definition available.
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