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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 |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |

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