Subsequent Events - Additional Information (Detail) - CARB-X [Member] - Subsequent Event [Member]	1 Months Ended
Oct. 31, 2017 USD ($)
Subsequent Event [Line Items]
Maximum amount of research funding receivable	$ 2,461,000
Additional research funding receivable based on completion of milestones	$ 3,119,000
Reimbursable expense, beginning period	2017-11

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