Subsequent Event - Additional Information (Detail) - 2011 Stock Option and Incentive Plan [Member] - shares		1 Months Ended
Apr. 26, 2017	May 31, 2016
Subsequent Event [Line Items]
Increased by number of shares available for grant		1,300,000
Subsequent Event [Member]
Subsequent Event [Line Items]
Increased by number of shares available for grant	850,000

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

No definition available.

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration