Common Stock Warrant Liability - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		12 Months Ended
	Jun. 11, 2010	Sep. 30, 2015	May. 31, 2015	Dec. 31, 2015	Jun. 30, 2015	Feb. 28, 2015	Jun. 30, 2010
Class Of Warrant Or Right [Line Items]
Warrant issued to purchase common stock	1,500,000
Aggregate purchase price of common stock warrant	$ 0.3
Warrant vested upon issuance					20.00%
Common stock warrants vesting percentage on each anniversary date					20.00%
Common stock warrants percentage vested					100.00%
Exercise price of warrants	$ 10.30			$ 5.64		$ 5.64	$ 10.30
Common stock warrants expiration date				2020-06
Number of warrants exercised		16,667	15,000
Warrants issued on cashless basis			7,500
Common stock issued for exercised warrants		6,969	9,360
Proceeds from issuance of common stock for warrants exercised			$ 0.1
Warrants outstanding				1,468,333			1,500,000
NABCO
Class Of Warrant Or Right [Line Items]
Price per share of common stock issued				$ 5.64