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Stockholders' Equity - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Dec. 31, 2013
Sep. 30, 2015
Sep. 30, 2014
Class of Stock [Line Items]      
Number of warrants   1,176,105 1,176,105
Weighted Average Exercise Price   $ 3.67 $ 3.67
Outstanding warrants remaining contract life, weighted average period   1 year 1 month 6 days  
Weighted-average grant date fair value, per share   $ 2.87  
Options vested during the period   601,355  
Unrecognized compensation expense   $ 2,400,000  
Unrecognized compensation expense weighted average period   2 years  
At-the-Market Offering [Member]      
Class of Stock [Line Items]      
Common stock shares maximum aggregate offering price $ 19,200,000    
Agreement transaction costs $ 153,000    
Stock issuances, sales agent commission maximum percentage 3.00%    
Common stock issued to investors   0 0
Minimum [Member]      
Class of Stock [Line Items]      
Outstanding warrants remaining contract life   4 months  
Maximum [Member]      
Class of Stock [Line Items]      
Outstanding warrants remaining contract life   1 year 10 months 24 days  
2008 Incentive Plan [Member]      
Class of Stock [Line Items]      
Number of common stock, authorized for issuance   7,091,255  
Shares available for grant   1,427,791  
Options granted with annual vesting   446,000  
Ratable annual vesting period of granted options   4 years  
Contractual life of option grants   10 years