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Defined Contribution Plan (Details) - USD ($) $ in Millions	12 Months Ended
	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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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

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No definition available.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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- Definition

Amount of matching contributions made by an employer to a defined contribution plan.

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- Definition

Period consider for new employees to cover under defined contribution plan.

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No definition available.

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