Stockholders' Equity - Summary of Reserved Shares of Common Stock for Future Issuance (Details) - shares	Jun. 30, 2016	Dec. 31, 2015	Feb. 28, 2014
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	5,419,247	4,206,809
Restricted Stock
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	159,640	216,716
Stock Options and Restricted Stock Units
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	3,150,718	2,231,057
Employee Stock Purchase Plan
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	803,105	440,304
2014 Plans
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	1,305,784	1,318,732	1,785,000