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Equity Financings and Warrants (Details) (USD $)
 1 Months Ended 6 Months Ended 138 Months Ended 1 Months Ended 1 Months Ended
Jun. 04, 2013
Jun. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 04, 2013
Series A Convertible Preferred Stock
Jun. 04, 2013
Warrant
Jun. 30, 2013
Warrant
Jun. 30, 2013
Warrant
Minimum
Jun. 30, 2013
Warrant
Maximum
Jan. 22, 2013
PIPE Transaction
2013 Equity Financings
Jan. 22, 2013
PIPE Transaction
2013 Equity Financings
Warrant
Jan. 31, 2013
Registered Direct Offering
2013 Equity Financings
Jan. 31, 2013
Registered Direct Offering
2013 Equity Financings
Warrant
Jan. 31, 2013
Registered Direct Offering
Two Zero One One Equity Financings
Jun. 04, 2013
ARCA’s Director and Chief Executive Officer
Equity financings and warrants (Textual) [Abstract]                              
Common stock, shares issued   10,096,162 10,096,162 2,660,315           356,430   164,636      
Additional shares purchased         6,250,000         249,501   65,855     39,050
Aggregate gross proceeds                   $ 1,000,000   $ 730,000      
Proceeds from the issuance of common stock   1,741,000 15,850,000             805,000   616,000      
Public Equity Offering Close Date                   Jan. 25, 2013          
Shares of common stock purchased                     0.70   0.40    
Purchase price for common stock unit                   2.81   4.43      
Warrants were exercisable upon issuance, expiry year                   7 years   5 years      
Closing bid price of the common stock                   100.00%          
Warrant price per share 1.60           2.53 1.60 116.89 2.28   4.13      
Number of warrants outstanding             8,200,000                
Convertible preferred stock, issued         125,000                   781
Stock issued during period, shares, conversion of convertible securities         6,250,000         249,501   65,855     39,050
Purchase price of preferred stock         160                    
Aggregate gross proceeds         20,000,000                    
Aggregate Net Proceeds         17,900,000                    
Convertible preferred stock shares issued upon conversion 100                            
Maximum limit on percentage of ownership in common stock 9.99%                            
Preferred stock liquidation preference per share $ 0.001                            
Common Stock, Shares, Issued for Preferred Stock           50                  
Registered Direct Offering Close Date                           Feb. 04, 2013  
Deemed preferred stock dividend for beneficial conversion feature   $ 2,026,000