Stockholders' Equity- Schedule of Common Stock Reserved for Issuance(Details) - shares	Sep. 30, 2016	Dec. 31, 2015
Class Of Stock [Line Items]
Shares reserved for future issuance, shares	3,092,760	3,070,718
Options Issued and Outstanding
Class Of Stock [Line Items]
Shares reserved for future issuance, shares	2,034,777	1,318,647
2015 Stock Option and Incentive Plan
Class Of Stock [Line Items]
Shares reserved for future issuance, shares	828,012	1,497,071
2015 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for future issuance, shares	229,971	255,000