EXHIBIT 11.1 COMPUTATION OF LOSS PER SHARE (IN THOUSANDS EXCEPT PER SHARE AMOUNTS) YEAR ENDED DECEMBER 31, ----------------------------- 1996 1995 1994 --------- --------- ------- Net loss attributable to common stockholders.... $ (10,220) $ (10,411) $(5,587) ========= ========= ======= Weighted average shares used to compute net loss per share Weighted average number of shares outstanding: Convertible Preferred Stock..................... 3,682 5,706 4,461 Common Stock.................................... 4,857 569 551 Number of common equivalents as a result of warrants granted using the treasury stock method in accordance with Staff Accounting Bulletin 83.................................... 46 185 185 Number of common equivalents as a result of stock options granted using the treasury stock method in accordance with Staff Accounting Bulletin 83.................................... 118 474 474 --------- --------- ------- Total........................................... 8,703 6,934 5,671 ========= ========= ======= Net loss per share attributable to common stockholders................................... $ (1.17) $ (1.50) $ (0.99) --------- --------- ------- 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.