Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		12 Months Ended
	Oct. 29, 2015	Oct. 31, 2016	Apr. 30, 2015	Dec. 31, 2016	Dec. 31, 2015
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Date of incorporation				Jun. 08, 2012
Cash, cash equivalents and investments				$ 151,900
Series B Redeemable Convertible Preferred Stock
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Issuance of common stock			17,068,646
Net proceeds from sale of shares of convertible stock			$ 45,800		$ 45,837
IPO
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Issuance of common stock	6,253,125
Shares issued, price per share	$ 10.00
Net proceeds from initial public offering	$ 55,600
Follow-on Offering
Organization Consolidation And Presentation Of Financial Statements [Line Items]
Shares issued, price per share		$ 15.00
Net proceeds from issuance of common stock		$ 61,100		$ 61,148