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401(K) Plan - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($)
Defined Contribution Pension And Other Postretirement Plans Disclosure [Abstract]
Defined contribution plan, employer contribution	$ 0

X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration