Benefit Plans (Details) - USD ($)	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Contribution to 401(k) plan	$ 330,415	$ 256,309	$ 347,632
Percentage eligible pay for dollar by dollar fixed match (in hundredths)	1.00%
Employer contribution for each dollar contributed by employee after 1% of eligible pay	$ 0.5
Maximum percentage of employee gross pay employer can contribute under 401(k) plan (in hundredths)	5.00%
Employee contribution limit for employees under 50 years of age	$ 18,000	18,000	18,000
Employee contribution limit for employees of 50 years of age or older	$ 24,000	$ 24,000	$ 24,000

Maximum amount can be contributed by employee of 50 years of age or older under 401(k) plan.

No definition available.

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- Definition

Maximum amount can be contributed by employee below 50 years of age under 401(k) plan.

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No definition available.

+ Details

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- References

No definition available.

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- Definition

The amount of payment into the fund established for purposes of making future disbursements to the individual in accordance with the terms and understanding of the deferred compensation arrangement.

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No definition available.

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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

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

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No definition available.

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