XML 18 R28.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stockholders' Equity - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended
Oct. 20, 2009
Oct. 13, 2006
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Shareholders Equity [Line Items]          
Issuance of Convertible Preferred Stock, shares     0   0
Conversion of principal and accrued interest related earlier bridge financing $ 16,099,770        
Undesignated preferred stock, authorized     5,000,000   5,000,000
Common stock, authorized     100,000,000   70,258,276
Common stock, par value     $ 0.001   $ 0.001
Undesignated preferred stock, par value     $ 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    
Unrecognized compensation expense related to unvested options yet has not been recognized     109,848    
Period for unrecognized compensation expense related to unvested options yet has not been recognized     1 year    
Fair value of shares vested     17,825 77,536  
Weighted-average fair value of the options granted     $ 6.13    
2013 Equity Incentive Plan [Member]
          
Shareholders Equity [Line Items]          
Shares Granted     756,537    
Unrecognized compensation expense related to unvested options yet has not been recognized     4,218,834    
Period for unrecognized compensation expense related to unvested options yet has not been recognized     3 years 7 months 6 days    
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    
Two Thousand Three Stock Incentive Plan [Member]
          
Shareholders Equity [Line Items]          
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    
Shares Granted       0  
Common Stock [Member] | 2013 Equity Incentive Plan [Member] | Maximum [Member]
          
Shareholders Equity [Line Items]          
Common stock issued under 2013 plan     1,000,000    
Common Stock [Member] | Convertible Notes Payable [Member]
          
Shareholders Equity [Line Items]          
Warrants issued for common stock     633,709    
Series A-1 Convertible Preferred Stock [Member]
          
Shareholders Equity [Line Items]          
Issuance of Convertible Preferred Stock, shares 30,726,326        
Issuance of Convertible Preferred Stock $ 38,979,412        
Reverse stock split 1-for-10 reverse stock split        
IPO [Member]
          
Shareholders Equity [Line Items]          
Outstanding shares of convertible preferred stock converted into common stock     9,305,359    
Undesignated preferred stock, authorized     5,000,000    
Common stock, authorized     100,000,000    
Common stock, par value     $ 0.001    
Undesignated preferred stock, par value     $ 0.001