Subsequent Events - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended			0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Pro Forma [Member]	Jun. 30, 2014 Pro Forma [Member] Subordinated Convertible Promissory Note [Member]	Jun. 30, 2014 Pro Forma [Member] IPO [Member]	Jul. 22, 2014 Subsequent Event [Member]	Aug. 28, 2014 Subsequent Event [Member] IPO [Member]	Jul. 22, 2014 Subsequent Event [Member] IPO [Member]	Jul. 22, 2014 Subsequent Event [Member] Amendment [Member]	Jul. 22, 2014 Subsequent Event [Member] Amendment [Member]
Subsequent Event [Line Items]
Common stock, shares authorized	10,000,000	7,737,226								100,000,000
Common stock, par value	$ 0.001	$ 0.001								$ 0.001
Convertible preferred stock, shares authorized	7,501,370	6,417,954								10,000,000
Convertible preferred stock, par value	$ 0.001	$ 0.001								$ 0.001
Number of common stock issued through public offering								4,000,000
Public offering price per share					$ 10.00
Issuance of additional shares pursuant to exercise of underwriters' overallotment option									220,000
Net cash proceeds from IPO, net of underwriting discounts and commissions							$ 35.5
Shares issued upon conversion			6,048,220	510,000		510,777
Reclassification of the convertible preferred stock warrant liability to additional paid-in capital			$ 0.8