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Convertible Notes Payable to Shareholders - Additional Information (Detail)
1 Months Ended 2 Months Ended 3 Months Ended 12 Months Ended
Nov. 30, 2010
USD ($)
$ / shares
shares
Apr. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2015
Dec. 31, 2014
USD ($)
Apr. 15, 2014
shares
Aug. 31, 2013
USD ($)
Sep. 30, 2010
USD ($)
May. 31, 2010
USD ($)
Debt Instrument [Line Items]                    
Debt instrument, Original principal amount               $ 8,824,000    
Debt instrument stated interest rate               7.00%    
Debt instrument conversion of principal and accrued interest           $ 20,129,000        
Loss on extinguishment of debt       $ (2,493,000)   $ (2,493,000)        
Convertible Notes Payable [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, Original principal amount                 $ 1,500,000 $ 5,000,000
Debt instrument stated interest rate     7.00%           7.00% 7.00%
Preferred stock shares became exercisable | shares             60,532      
Fair value of warrants $ 474,000                  
Expected volatility 80.00%                  
Expected life 7 years                  
Risk-free interest rate 1.85%                  
Dividend yield | $ / shares $ 0                  
Debt instrument, Conversion Ratio     0.775              
IPO closure date         Apr. 15, 2014          
Loss on extinguishment of debt   $ (2,493,000)                
Convertible Notes Payable [Member] | Existing Investors [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, Original principal amount     $ 6,000,000              
Convertible Notes Payable [Member] | New Investor [Member]                    
Debt Instrument [Line Items]                    
Debt instrument, Original principal amount     $ 2,500,000              
Convertible Notes Payable [Member] | Series C Convertible Preferred Stock [Member]                    
Debt Instrument [Line Items]                    
Debt instrument conversion of principal and accrued interest $ 176,000                  
Debt instrument conversion shares | shares 9,021,175                  
Debt instrument conversion price | $ / shares $ 0.74                  
Percentage to determine the number of shares included in warrants 10.00%                  
Preferred stock shares became exercisable | shares 878,370                  
Preferred stock per share | $ / shares $ 0.74