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Stockholders' Equity - Additional Information 2 (Detail) - USD ($)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Jun. 30, 2015
Jun. 30, 2014
Sep. 30, 2014
Mar. 31, 2012
Mar. 31, 2011
Class Of Stock [Line Items]              
Warrant liability reduced     $ 138,000 $ 55,000      
Exercised derivative liabilities     38,234 8,647      
Warrants to purchase common stock 145,000 75,000          
Warrants maturity term 5 years 5 years       5 years 5 years
Volatility 76.78% 96.90% 74.25% 78.02%      
Risk-free interest rate 1.37% 0.60% 1.65% 1.56%      
Recognized expenses of warrants     $ 101,000        
Warrants earned, service period 17 months 12 months          
Warrants issued         50,000    
Weighted-average remaining contractual term of options exercisable     7 years 6 months 7 days        
Preferred stock, shares authorized     25,000,000        
Preferred stock, shares outstanding     0        
Consultation Service Agreement September 2014              
Class Of Stock [Line Items]              
Recognized expenses of warrants     $ 273,000        
Consultation Service Agreement November 2014              
Class Of Stock [Line Items]              
Recognized expenses of warrants     $ 34,000        
Minimum [Member]              
Class Of Stock [Line Items]              
Warrants exercisable price, per share     $ 0.85        
Maximum [Member]              
Class Of Stock [Line Items]              
Warrants exercisable price, per share     $ 7.62        
Warrants [Member]              
Class Of Stock [Line Items]              
Number of warrant exercised through cashless     38,234 8,647      
Cashless exercise for issuance of common stock     30,186 7,600      
Number Of Warrants Exercised       103,000      
Warrants exercisable price, per share $ 6.84 $ 7.36          
Warrant liability reduced       $ 224,000      
Amount reversed against operating expense     $ 130,000        
Warrants liability     $ 138,000 $ 55,000      
Estimated fair value of warrants $ 309,000 $ 404,000          
Weighted-average remaining contractual term of options exercisable     2 years 1 month 21 days        
Warrants [Member] | Minimum [Member]              
Class Of Stock [Line Items]              
Warrants exercisable price, per share       $ 1.00      
Warrants [Member] | Maximum [Member]              
Class Of Stock [Line Items]              
Warrants exercisable price, per share       $ 2.21