Stockholders' Equity - Summary of Reserved Shares of Common Stock for Future Issuance (Details) - shares	Dec. 31, 2015	Dec. 31, 2014	Feb. 28, 2014
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	4,206,809	3,760,145
Restricted Stock
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	216,716	422,145
Stock Options and Restricted Stock Units
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	2,231,057	1,526,346
Employee Stock Purchase Plan
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	440,304	262,500
2014 Plans
Class of Stock [Line Items]
Common stock, shares reserved for future issuance	1,318,732	1,549,154	1,785,000