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Convertible Notes Payable - Convertible Notes - Additional Information (Detail) (USD $)
1 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Aug. 31, 2013
May 28, 2013
Sep. 30, 2013
Sep. 30, 2013
Common stock [Member]
May 28, 2013
Common stock [Member]
Sep. 30, 2013
Equity securities [Member]
Sep. 30, 2013
March 2012 convertible notes [Member]
Sep. 30, 2013
March 2012 convertible notes [Member]
Equity securities [Member]
Sep. 30, 2013
October 2012 convertible notes [Member]
Sep. 30, 2013
October 2012 convertible notes [Member]
Common stock [Member]
Sep. 30, 2013
October 2012 convertible notes [Member]
Equity securities [Member]
Sep. 30, 2013
March 2012 and October 2012 convertible notes [Member]
Dec. 31, 2012
March 2012 and October 2012 convertible notes [Member]
Sep. 30, 2013
March 2012 and October 2012 convertible notes [Member]
Maximum [Member]
Sep. 30, 2013
March 2012 and October 2012 convertible notes [Member]
Minimum [Member]
Sep. 30, 2013
March 2012 and October 2012 convertible notes [Member]
Common stock [Member]
Debt Instrument [Line Items]                                
Issued and sold convertible notes             $ 8,076,000   $ 1,000,000              
Maturity Date             Sep. 30, 2013   Sep. 30, 2013              
Accrued interest             10.00%   10.00%              
Proceeds from issuance of public offering 56,105,000   56,105,000 30,000,000   5,000,000                    
Business acquisition voting transfer       50.00%                        
Convertible Notes convert into equity securities of purchase price         70.00%     80.00%   80.00% 85.00%         70.00%
Discount on conversion price                           20.00% 30.00%  
Public offering price of the shares sold $ 12.00                     $ 12        
Estimated fair value of Convertible Notes as of issuance dates             9,343,000   1,772,000     14,599,000 22,518,000      
Proceeds from issuance of Convertible Notes   3,000,000                   9,076,000        
Excess of estimated fair value of Convertible Notes                       2,039,000        
Increase of estimated fair value of Convertible Notes                       $ 8,516,000