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Common Stock Reserved for Future Issuance (Details) - shares	Mar. 31, 2016	Dec. 31, 2015
Stockholders' equity
Shares reserved for future issuance (in shares)	3,513,436	2,799,213
Warrants for purchase of Common Stock
Stockholders' equity
Shares reserved for future issuance (in shares)	36,084	59,405
Options to purchase Common stock
Stockholders' equity
Shares reserved for future issuance (in shares)	3,141,868	2,557,456
Employee Stock Purchase Plan
Stockholders' equity
Shares reserved for future issuance (in shares)	335,484	182,352

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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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