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Stockholders' Equity - Summary of Number of Shares of Common Stock Reserved (Detail) - shares	Dec. 31, 2015	Dec. 31, 2014
Class Of Stock [Line Items]
Reserved shares of common stock	4,296,440	3,689,767
Common stock options [Member]
Class Of Stock [Line Items]
Reserved shares of common stock	3,995,876	3,561,104
Warrants to Purchase Common Stock [Member]
Class Of Stock [Line Items]
Reserved shares of common stock	300,564	128,663

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- Definition

Aggregate number of common shares reserved for future issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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