Stockholders' Equity - Additional Information (Detail)	Sep. 30, 2016 shares
Stockholders' Equity Note [Abstract]
Common stock reserved for issuance upon exercise of outstanding common stock options and vesting of restricted stock units	3,067,034
Common stock reserved for future grants of stock options and restricted stock units	2,125,676
Outstanding warrants to purchase common stock	0

Number of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant