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Shareholders' Equity (Detail) (USD $)
 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2014
Oct. 31, 2010
warrant
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Mar. 29, 2007
Sep. 30, 2014
Oxford
Sep. 30, 2014
Warrant-Series E
Mar. 31, 2014
Series E Mod 1Q14
Sep. 30, 2014
Series E Mod 3Q14
Sep. 30, 2014
Warrant One
Vulcan Incorporated
Oct. 31, 2010
Warrant One
Vulcan Incorporated
Sep. 30, 2014
Warrant Two
Vulcan Incorporated
Oct. 31, 2010
Warrant Two
Vulcan Incorporated
Sep. 30, 2014
Warrant Three
Vulcan Incorporated
Oct. 31, 2010
Warrant Three
Vulcan Incorporated
Class of Stock [Line Items]                                
Stock Issued During Period, Shares, New Issues       3,500,000                        
Share Price $ 11.50   $ 11.50 $ 11.50                        
Payments of Stock Issuance Costs       $ 2,500,000                        
Proceeds from issuance of common stock, net of offering costs       37,754,000 16,120,000                      
Shares of common stock to purchase by warrant 192,789   192,789 192,789   197,478 11,539       133,333 133,333 133,333 133,333 133,333 133,333
Warrant expiration date             Apr. 26, 2015   Sep. 29, 2014 Mar. 29, 2015 Oct. 21, 2015   Oct. 21, 2015   Oct. 21, 2015  
Exercise price of warrants $ 12.25   $ 12.25 $ 12.25   $ 12.25 $ 9.13       $ 20.00 $ 20.00 $ 30.00 $ 30.00 $ 40.00 $ 40.00
Class of Warrant or Right, Outstanding 604,327   604,327 604,327                        
Fair Value Adjustment of Warrants       (863,000)         (452,000) (411,000)            
Class of Warrant or Right, Exercised During Period 4,689                              
Stock Issued During Period, Shares, Other 3,305             3,088                
Proceeds from Warrant Exercises     $ 37,828                          
Class of Warrant or Right, Exercise Price of Warrants or Rights, Weighted Average Price 23.94   23.94 23.94                        
Number of warrants issued   3