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Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Defined Contribution Plan Disclosure [Line Items]
Total employee contributions	$ 35	$ 56
Vesting period	6 years
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Gross employee contribution	100.00%
Each participant's gross salary	4.00%
Minimum [Member]
Defined Contribution Plan Disclosure [Line Items]
Gross employee contribution	50.00%
Each participant's gross salary	3.00%

X

- Definition

Defined contribution plan vesting period.

+ References

No definition available.

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

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

+ References

No definition available.

+ Details

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- Details

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X

- Details

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