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Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 0 Months Ended
Apr. 14, 2014
Oct. 20, 2009
Oct. 13, 2006
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
2003 Stock Incentive Plan [Member]
Jun. 30, 2013
2003 Stock Incentive Plan [Member]
Jun. 30, 2014
2013 Equity Incentive Plan [Member]
Oct. 20, 2009
Series A-1 Convertible Preferred Stock [Member]
Jun. 30, 2014
Series A-1 Convertible Preferred Stock [Member]
Oct. 20, 2009
Series A-1 Convertible Preferred Stock [Member]
Jun. 30, 2014
Common Stock [Member]
2013 Equity Incentive Plan [Member]
Maximum [Member]
Jun. 30, 2014
Common Stock [Member]
Convertible Notes Payable [Member]
Jan. 15, 2014
Initial Public Offering [Member]
Jun. 30, 2014
Initial Public Offering [Member]
Shareholders Equity [Line Items]                              
Issuance of Convertible Preferred Stock, shares       0 0           30,726,326        
Issuance of Convertible Preferred Stock                 $ 38,979,412            
Conversion of principal and accrued interest related earlier bridge financing   16,099,770                          
Reverse stock split       1-for-3.302           1-for-10 reverse stock split          
Outstanding shares of convertible preferred stock converted into common stock                           9,305,359  
Undesignated preferred stock, authorized       5,000,000 5,000,000                   5,000,000
Common stock, shares authorized       100,000,000 70,258,276                   100,000,000
Common stock, par value       $ 0.001 $ 0.001                   $ 0.001
Undesignated preferred stock, par value       $ 0.001 $ 0.001                   $ 0.001
Date of effectiveness of reverse stock split       Oct. 25, 2013                      
Number of shares underlying warrants     1,544                        
Exercise price per share     $ 25.92                        
Expiry date of converted share in common stock       2016-10                      
Warrants issued for common stock 1,026                       633,709    
Warrant exercise price $ 0.33                            
Proceeds from exercise of warrant 339                            
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage           25.00%                  
Share-based Compensation Arrangement by Share-based Payment Award, Description           Unless otherwise stated in a stock option agreement, 25% of the shares subject to an option grant will vest upon the first anniversary of the vesting start date and thereafter at the rate of one forty-eighth of the option shares per month as of the first day of each month after the first anniversary                  
Period of vested options shall terminate after termination date           60 days                  
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date           May 21, 2013                  
Outstanding Options, granted             9,297 919,188              
Weighted-Average Exercise price, Options granted             $ 3.73 $ 8.90              
Unrecognized compensation expense related to unvested options yet has not been recognized           95,624   5,322,601              
Period for unrecognized compensation expense related to unvested options yet has not been recognized           1 year   3 years 4 months 24 days              
Fair value of shares vested           $ 30,308 $ 180,295                
Common stock issued under 2013 plan                       1,000,000      
Shares of common stock reserved for issuance, percentage increase               3.00%              
Maximum number of shares that may be issued pursuant to exercise of incentive stock               20,000,000              
Weighted-average fair value of the options granted       $ 6.72