Common Stock Warrant Liability - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended		9 Months Ended
	Jun. 11, 2010	Sep. 30, 2015	May. 31, 2015	Sep. 30, 2015	Jun. 30, 2015
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
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	6,969
Proceeds from issuance of common stock for warrants exercised			$ 0.1
Warrants outstanding		1,468,333		1,468,333
NABCO
Class Of Warrant Or Right [Line Items]
Price per share of common stock issued		$ 5.64		$ 5.64