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Subsequent Events - Additional Information (Detail) (USD $)
 3 Months Ended 0 Months Ended 0 Months Ended
Mar. 31, 2014
Dec. 31, 2013
May 07, 2014
Subsequent Event [Member]
Apr. 29, 2014
Subsequent Event [Member]
Apr. 25, 2014
Subsequent Event [Member]
Mar. 31, 2014
Subsequent Event [Member]
May 07, 2014
Subsequent Event [Member]
Common Stock Warrants [Member]
May 07, 2014
Subsequent Event [Member]
Pro Forma [Member]
Mar. 31, 2014
Subsequent Event [Member]
Pro Forma [Member]
Subsequent Event [Line Items]                  
Reverse stock split ratio 1-for-4 reverse stock split       1-for-5.1 reverse stock split        
Underlying shares of the warrants issued, for which the exercise price was lowered to the IPO price       53,404          
Exercise price of options, lower range       $ 20.40          
Exercise price of options, upper range       $ 61.20          
Weighted average exercise price of options       $ 54.87          
Agreement date Apr. 29, 2014                
Number of shares of common stock sold     6,200,000            
Public offering price per share     $ 10            
Net proceed from initial public offering     $ 54,800,000            
Underwriting discounts and commissions     3,300,000            
Offering expenses     3,900,000            
Outstanding debt     15,000,000            
Number of preferred stock converted into common stock     1,967,571            
Completion of IPO May 07, 2014                
Deferred financing costs 1,608,000 2,144,000 1,608,000            
Number of preferred stock converted into common stock     1,691,884         1,691,884  
Issuance of shares of common stock pursuant to the exercise of outstanding warrants     275,687            
Deferred offering costs 3,645,000 1,775,000 3,645,000            
Derivative liability $ 9,998,000 $ 12,237,000       $ 9,998,000 $ 9,998,000   $ 0