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Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Millions
3 Months Ended
May. 08, 2015
shares
May. 05, 2015
USD ($)
$ / shares
shares
May. 22, 2014
shares
May. 14, 2010
shares
Mar. 31, 2016
plan
shares
Stockholders' Equity (Textual) [Abstract]          
Stock issued during period (shares)   10,925,000      
Offering price ($ per share) | $ / shares   $ 8.00      
Proceeds from initial public offering | $   $ 81.9      
Number of plans | plan         1
Award vesting period         3 years
Maximum contractual term         10 years
Stock and Cash Based Incentive Plan [Member]          
Stockholders' Equity (Textual) [Abstract]          
Number of additional shares authorized 2,000,000   1,250,000 500,000  
Number of potential shares authorized for issuance under share based compensation plan       513,833  
Number of shares authorized         7,770,497
Number of shares available for grant         633,988
Number of shares of unvested restricted stock units and options outstanding         732,668
Common stock, other shares, outstanding (shares)         5,821,784
Amended 2000 Stock Option Plan [Member]          
Stockholders' Equity (Textual) [Abstract]          
Options outstanding (shares)         106,877
VGX Equity Compensation Plan [Member]          
Stockholders' Equity (Textual) [Abstract]          
Options outstanding (shares)         1,206,963
Over-Allotment Option [Member]          
Stockholders' Equity (Textual) [Abstract]          
Stock issued during period (shares)   1,425,000