Stockholders' Equity - Common Stock Reserved for Future Issuance (Details) - shares	Dec. 31, 2016	Apr. 03, 2014
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	14,904,000
2014 Equity Incentive Plan
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	6,095,000
Employee Stock Options
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	5,556,000
Restricted Stock Units
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	2,019,000
ESPP
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	1,102,224	880,000
Warrants
Class of Stock [Line Items]
Shares of common stock reserved for future issuance (in shares)	132,000