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Employee Benefit Plans - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2017 USD ($)
Retirement Benefits [Abstract]
Maximum rate of employees' contribution to 401(k) plan	100.00%
Employer match percentage	200.00%
Employer matching contributions	$ 1,500

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- Definition

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

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Maximum amount the employee may contribute to a defined contribution plan.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

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