Quarterly report pursuant to Section 13 or 15(d)

Net Income (Loss) Per Share (Schedule of Antidilutive Securities) (Details)

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Net Income (Loss) Per Share (Schedule of Antidilutive Securities) (Details) - shares
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities 26,974,253   26,974,253 21,619,737
Options to purchase common stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities 13,227,092   13,227,092 7,073,652
Warrants to purchase common stock [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities 13,747,161   13,747,161 14,546,085