Stock Warrants (Additional Information) (Detail)	6 Months Ended
Jun. 30, 2017 $ / shares
Class of Warrant or Right [Line Items]
Weighted average term of warrants	10 months 24 days
Weighted average exercise price of warrants per share	$ 2.66

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.

No definition available.

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