Net loss per common share	6 Months Ended
Jun. 30, 2015
Net loss per common share	11. Net loss per common share Basic net loss per share excludes dilution for potentially dilutive securities and is computed by dividing net loss by the weighted average number of common shares outstanding during the period excluding the shares loaned to Bank of America under a share lending arrangement (see Note 9 — Common and preferred stock). As of June 30, 2015, 9,000,000 shares of the Company’s common stock, which were loaned to Bank of America pursuant to the terms of a share lending agreement, were issued and are outstanding, and the holder of the borrowed shares has all the rights of a holder of the Company’s common stock. However, because the share borrower must return all borrowed shares to the Company (or, in certain circumstances, the cash value thereof), the borrowed shares are not considered outstanding for the purpose of computing and reporting basic or diluted earnings (loss) per share. Diluted net loss per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Potentially dilutive securities are excluded from the computation of diluted net loss per share for all of the periods presented in the accompanying condensed consolidated statements of operations because the reported net loss in each of these periods results in their inclusion being antidilutive. Antidilutive securities, which consist of stock options, restricted stock units, warrants, and shares that could be issued upon conversion of the senior convertible notes, that are not included in the diluted net loss per share calculation consisted of an aggregate of 40,982,544 shares and 56,844,341 shares as of June 30, 2015 and 2014, respectively, and exclude the 9,000,000 shares loaned under the share lending arrangement.

Net loss per common share

6 Months Ended

Jun. 30, 2015

11. Net loss per common share

Basic net loss per share excludes dilution for potentially dilutive securities and is computed by dividing net loss by the weighted average number of common shares outstanding during the period excluding the shares loaned to Bank of America under a share lending arrangement (see Note 9 — Common and preferred stock). As of June 30, 2015, 9,000,000 shares of the Company’s common stock, which were loaned to Bank of America pursuant to the terms of a share lending agreement, were issued and are outstanding, and the holder of the borrowed shares has all the rights of a holder of the Company’s common stock. However, because the share borrower must return all borrowed shares to the Company (or, in certain circumstances, the cash value thereof), the borrowed shares are not considered outstanding for the purpose of computing and reporting basic or diluted earnings (loss) per share. Diluted net loss per share reflects the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock. Potentially dilutive securities are excluded from the computation of diluted net loss per share for all of the periods presented in the accompanying condensed consolidated statements of operations because the reported net loss in each of these periods results in their inclusion being antidilutive. Antidilutive securities, which consist of stock options, restricted stock units, warrants, and shares that could be issued upon conversion of the senior convertible notes, that are not included in the diluted net loss per share calculation consisted of an aggregate of 40,982,544 shares and 56,844,341 shares as of June 30, 2015 and 2014, respectively, and exclude the 9,000,000 shares loaned under the share lending arrangement.