Loss per Share	3 Months Ended
Mar. 31, 2015
Earnings Per Share [Abstract]
Loss per Share	Loss per Share Basic net loss per common share has been calculated based upon the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is also computed using the weighted average number of common shares and excludes dilutive instruments as their effect would be anti-dilutive. Dilutive instruments consist primarily of employee stock options and stock warrants. Diluted net loss per share is equal to basic net loss per share and is therefore not presented separately in the financial statements. The weighted average number of potential common shares that would have been included in diluted loss per share, had their effect not been anti-dilutive for each of the three-month periods ended March 31, 2015 and 2014 were approximately 76,000 shares and 39,000 shares, respectively. Employee stock options and other stock warrants to purchase a weighted average of approximately 7,639,000 and 6,299,000 shares were outstanding for the three-month periods ended March 31, 2015 and 2014, respectively, but have not been included in the computation of diluted loss per share because their effect would have been anti-dilutive.

Loss per Share

3 Months Ended

Mar. 31, 2015

Basic net loss per common share has been calculated based upon the weighted average number of shares of common stock outstanding during the period. Diluted net loss per share is also computed using the weighted average number of common shares and excludes dilutive instruments as their effect would be anti-dilutive. Dilutive instruments consist primarily of employee stock options and stock warrants. Diluted net loss per share is equal to basic net loss per share and is therefore not presented separately in the financial statements. The weighted average number of potential common shares that would have been included in diluted loss per share, had their effect not been anti-dilutive for each of the three-month periods ended March 31, 2015 and 2014 were approximately 76,000 shares and 39,000 shares, respectively. Employee stock options and other stock warrants to purchase a weighted average of approximately 7,639,000 and 6,299,000 shares were outstanding for the three-month periods ended March 31, 2015 and 2014, respectively, but have not been included in the computation of diluted loss per share because their effect would have been anti-dilutive.