Subsequent Events - Narrative (Details)	1 Months Ended
	Jan. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Increase in stock authorized under employee purchase plans (in shares)	264,571
Stock authorized under employee purchase plans (in shares)	383,204
2013 Stock Option/Stock Issuance Plan [Member]
Subsequent Event [Line Items]
Common stock, reserved for future issuance (in shares)		758,074	853,557
2013 Stock Option/Stock Issuance Plan [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Common stock, increase in reserved for future issuance (in shares)	1,058,286
Common stock, reserved for future issuance (in shares)	1,816,360