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Convertible Notes Payable - October 2012 Subordinated Convertible Note - Additional Information (Detail) (USD $)
1 Months Ended 6 Months Ended 9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended
May 28, 2013
Jun. 30, 2013
Sep. 30, 2013
Aug. 31, 2013
Apr. 10, 2013
Dec. 31, 2012
Sep. 30, 2013
Non-current other liabilities [Member]
Sep. 30, 2013
Current and non-current other assets [Member]
Sep. 30, 2013
Legal fees [Member]
Oct. 31, 2012
October 2012 subordinated convertible note [Member]
Oct. 16, 2012
October 2012 subordinated convertible note [Member]
Sep. 30, 2013
October 2012 subordinated convertible note [Member]
Apr. 10, 2013
October 2012 subordinated convertible note [Member]
Dec. 31, 2012
October 2012 subordinated convertible note [Member]
Sep. 30, 2013
October 2012 subordinated convertible note [Member]
Conversion adjusted rate [Member]
Sep. 30, 2013
October 2012 subordinated convertible note [Member]
Maximum [Member]
Sep. 30, 2013
October 2012 subordinated convertible note [Member]
Minimum [Member]
Sep. 30, 2013
October 2012 subordinated convertible note [Member]
Agent fee [Member]
Dec. 31, 2012
October 2012 subordinated convertible note [Member]
Agent fee [Member]
Debt Instrument [Line Items]                                      
Company borrowed convertible note                     $ 2,500,000                
Convertible Note initial maturity term                     3 years                
Convertible Note additional maturity term                     2 years                
Convertible Note interest percentage per annum                     12.00% 12.00%              
Outstanding principal balance                       1,250,000   1,703,000          
Accrued interest on promissory notes   74,000 74,000                                
Convertible debt, fair value                       1,360,000 1,360,000            
Gain on extinguishment of debt     49,000                                
Converted Agent Fee             48,000 39,000                      
Agent Fee, percentage                   5.00%                  
Additional agent fee, percentage                   1.00%                  
Deferred financing costs     195,000   24,000 261,000     22,000 87,000               63,000 89,000
Convertible into share of common stock per share                       85.00%     80.00%        
Discount on conversion price                               20.00% 15.00%    
Public offering price of the shares sold       $ 12.00               $ 12              
Estimated fair value of Convertible Notes as of issuance dates                     2,662,000 2,500,000   2,797,000          
Proceeds from issuance of Convertible Notes 3,000,000                   2,500,000                
Excess of estimated fair value of Convertible Notes                     162,000                
Increase of estimated fair value of Convertible Notes                       $ 133,000