Stockholders' Equity - Additional Information (Details) (USD $)	0 Months Ended
	Mar. 06, 2014	Sep. 30, 2014	Mar. 25, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Common stock, shares authorized		175,000,000	175,000,000	14,700,000
Common stock, par value		$ 0.00001		$ 0.00001
Preferred stock, shares authorized		25,000,000	25,000,000	0
Preferred stock, par value		$ 0.00001		$ 0.00001
Stock split, conversion ratio	1.75
Redeemable convertible preferred stock, par value		$ 0.00001		$ 0.00001
Redeemable convertible preferred stock, shares authorized		0		5,500,636
Convertible redeemable preferred stock converted into common stock		0	12,115,183
Series A redeemable convertible preferred stock
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares authorized				734,538
Redeemable convertible preferred stock, shares outstanding		0		734,538
Series B redeemable convertible preferred stock
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares authorized				1,287,525
Redeemable convertible preferred stock, shares outstanding		0		1,287,525
Series C redeemable convertible preferred stock
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares authorized				3,428,572
Redeemable convertible preferred stock, shares outstanding		0		3,302,885
Series X Preferred Stock
Class of Stock [Line Items]
Redeemable convertible preferred stock, shares authorized				50,001
Redeemable convertible preferred stock, shares outstanding				0