XML 22 R31.htm IDEA: XBRL DOCUMENT v2.4.0.8
Stockholders' Equity - Additional Information (Detail) (USD $)
 1 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended
Jul. 31, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Options [Member]
Sep. 30, 2014
Minimum [Member]
Sep. 30, 2014
Maximum [Member]
Dec. 31, 2013
At-the-Market Offering [Member]
Sep. 30, 2014
2008 Incentive Plan [Member]
Sale Of Stock [Line Items]                
Common stock shares maximum aggregate offering price             $ 19,200,000  
Transaction costs             153,000  
Stock issuances, sales agent commission maximum percentage             3.00%  
Common stock issued to institutional investors 3,494,550              
Common stock price per share $ 3.10              
Proceeds from issuance of common stock 10,800,000              
Share issuance costs 890,000              
Number of warrants   1,176,105 1,176,105          
Weighted Average Exercise Price   $ 3.67 $ 3.67          
Outstanding warrants remaining contract life         1 year 3 months 18 days 2 years 10 months 24 days    
Outstanding warrants remaining contract life, weighted average period   2 years 1 month 6 days            
Number of common stock, authorized for issuance               6,341,255
Shares available for grant               1,440,497
Options granted with annual vesting       456,200       456,200
Vesting period of granted options       4 years        
Contractual life of option grants       10 years        
Weighted-average grant date fair value, per share   $ 3.44            
Options vested during the period   534,158            
Unrecognized compensation expense   $ 2,100,000            
Unrecognized compensation expense weighted average period   2 years