Quarterly report pursuant to Section 13 or 15(d)

Organization and Description of Business (Details Textual)

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Organization and Description of Business (Details Textual) (USD $)
 3 Months Ended 4 Months Ended 81 Months Ended 1 Months Ended 3 Months Ended 4 Months Ended
Mar. 31, 2013
May 07, 2013
Mar. 31, 2013
Dec. 31, 2012
Apr. 29, 2013
Market Issuance Sales Agreement [Member]
Mar. 31, 2013
Market Issuance Sales Agreement [Member]
Apr. 01, 2013
Market Issuance Sales Agreement [Member]
Mar. 31, 2013
Market Issuance Sales Agreement [Member]
May 07, 2013
Market Issuance Sales Agreement [Member]
Organization and Description of Business (Textual) [Abstract]                  
Public offering of Common Stock, shares   3,400,000           1,565,101  
Net proceeds from public offering of Common Stock $ 11,690,000   $ 40,743,000   $ 45,000,000 $ 11,100,000 $ 700,000 $ 11,800,000 $ 29,900,000
Utilization amount               30,000,000  
New stock issued during the period under new agreement         45,000,000        
Organization and Description of Business (Additional Textual) [Abstract]                  
Accumulated deficit $ (93,042,000)   $ (93,042,000) $ (84,184,000)          
Date of inception Jun. 28, 2006