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Defined Contribution Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Contribution Plan [Abstract] |  |  |
Required time period for employees for profit sharing plan | 3 months |  |
Maximum employer contribution as a percentage of employee contribution | 50.00% |  |
Contribution expense recognized | $ 0.0 | $ 0.0 | $ 0.0
Employer matching contribution amount | $ 1.5 | $ 1.1 | $ 0.9

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- References No definition available. + Details
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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 Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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- Definition Amount of matching contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Definition Period consider for new employees to cover under defined contribution plan. + References No definition available. + Details
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