1 Exhibit 11.1 Computation of net loss per share and unaudited pro forma net loss per share YEAR ENDED DECEMBER 31, ---------------------------------------------- 1997 1998 1999 ---- ---- ---- (in thousands, except per share data) Basic and diluted net loss per share: Net loss $(11,536) $(17,139) $ (5,539) ======== ======== ======== Basic and diluted weighted average common shares outstanding 4,316 7,175 22,771 ======== ======== ======== Basic and diluted net loss per share $ (2.67) $ (2.39) $ (0.24) ======== ======== ======== YEAR ENDED DECEMBER 31, ------------------------- 1998 1999 ---- ---- (in thousands, except per share data) Pro forma basic and diluted net loss per share: Net loss $ (17,139) $ (5,539) ======= ======= Pro forma basic and diluted weighted average shares outstanding: Shares attributable to common stock(1) 7,940 22,772 Shares attributable to the assumed conversion of convertible preferred stock upon closing of the IPO 7,636 462 ------- ------- Pro forma basic and diluted weighted average shares outstanding 15,576 23,234 ======= ======= Pro forma basic and diluted loss per share $ (1.10) $ (0.24) ------- ------- (1) Includes outstanding common stock subject to repurchase under a stock restriction agreement which lapsed upon the consummation of the initial public offering in January 1999.