Exhibit 11 COMPUTATION OF LOSS PER SHARE (in thousands except per share amounts) Three Months Ended Six Months Ended June 30, June 30, ------------------- ------------------- 1997 1996 1997 1996 -------- --------- --------- -------- Net loss attributable to common stockholders $(2,155) $(2,658) $(4,424) $(5,504) ======= ======== ======== ======= Weighted average shares used to compute net loss per share Weighted average number of shares outstanding: Convertible Preferred Stock - 7,091 - 6,398 Common Stock 10,477 574 10,471 572 Number of common equivalents as a result of warrants granted using the treasury stock method in accordance with Staff Accounting Bulletin 83 - - - 93 Number of common equivalents as a result of stock options granted using the treasury stock method in accordance with Staff Accounting Bulletin 83 - - - 237 ------- -------- -------- ------- Total 10,477 7,665 10,471 7,300 ======= ======== ======== ======= Net loss per share attributable to common stockholders $ (0.21) $ (0.35) $ (0.42) $(0.75) ======= ======== ======== ======= The calculations for all periods shown include the shares and warrants of convertible preferred stock as if they had converted to common stock on their respective original dates of issuance, because such shares automatically converted to common stock upon the closing of the Initial Public Offering of the Company's common stock.