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Employee Benefit Plan (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement Benefits [Abstract] |  |  |
Defined contribution plan, maximum annual contribution by employee, percent of eligible earnings (up to) | 80.00% |  |
Defined contribution plan, employer matching contribution per employee, amount (up to) | $ 1,500 |  |
Defined contribution plan, period after which cliff vest occurs (in years) | 1 year |  |
Defined contribution plan, employer discretionary contribution amount | $ 2,000,000 | $ 1,900,000 | $ 2,100,000

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum amount the employee may contribute to a defined contribution plan. + References No definition available. + Details
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