Stockholders' Equity - Summary of Roll Forward of Restricted Stock Activity Pursuant to the 2010 and 2013 Stock Plan (Parenthetical) (Detail)	Sep. 30, 2015 shares
2010 and 2013 Stock Incentive Plans [Member] \| Unvested Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining from early exercise of stock options	14,839

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