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Retirement Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employer matching contribution, percent of match	100.00%	100.00%
Employer matching contribution, percent of employees' gross pay	4.00%	3.00%
Employer contributions	$ 2.2	$ 0.8	$ 0.6

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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 of employees' gross pay for which the employer contributes a matching contribution 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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No definition available.

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