Subsequent Events - Additional Information (Detail) - USD ($)	9 Months Ended
Sep. 30, 2016	Oct. 31, 2016
Subsequent Event [Line Items]
Shares of common stock issued during period under At-The-Market Issuance Sales Agreement	0
Subsequent event [Member]
Subsequent Event [Line Items]
At-The-Market Issuance Sales Agreement, maximum value of common stock to be issued		$ 10,000,000

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