Annual report pursuant to Section 13 and 15(d)

Stock Plans and Stock Based Compensation (Details Textual)

v2.4.0.6
Stock Plans and Stock Based Compensation (Details Textual) (USD $)
 1 Months Ended 12 Months Ended
Nov. 30, 2012
Dec. 31, 2012
Installment
Dec. 19, 2011
Stock Plans and Stock-Based Compensation (Textual) [Abstract]      
Stock Based compensation, authorized number of shares   6,000,000  
Stock Based compensation, shares granted under the plan, net of cancellations   4,175,070  
Stock Based compensation, shares available for issuance   1,824,930  
Stock Based compensation, Options Contractual term   10 years  
Stock Based compensation, options, number of annual vesting   3  
Stock-based compensation expense related to all unvested stock option   $ 4,400,000  
Stock-based compensation weighted-average vesting period   1 year 4 months 24 days  
Employee Stock Purchase Plan to eligible employees, Authorized number of shares     200,000
Employee Stock Purchase Plan to eligible employees, Reckoning fair value percentage during offering period   85.00%  
Employee Stock Purchase Plan to eligible employees, Offering period   6 months  
Employee Stock Purchase Plan to eligible employees, Number of shares purchased by employees   21,644  
Employee Stock Purchase Plan to eligible employees, Number of shares available for future sales   178,356  
Employee Stock Purchase Plan to eligible employees, compensation expense recognized   $ 95,000  
Common Stock issued in connection with the first ESPP offering 21,644    
Common Shares were issued per share $ 4.02