<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1999             DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1999             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1999             DEC-31-1998             DEC-31-1997
<CASH>                                       1,821,945              17,499,487                       0
<SECURITIES>                                 5,986,918                       0                       0
<RECEIVABLES>                                  319,051                       0                       0
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                             8,518,662              17,617,559                       0
<PP&E>                                       2,219,435               1,580,949                       0
<DEPRECIATION>                             (1,209,589)               (715,278)                       0
<TOTAL-ASSETS>                               9,673,601              18,608,230                       0
<CURRENT-LIABILITIES>                        1,111,226                 792,691                       0
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                 31,476,099              31,476,099                       0
<COMMON>                                         6,929                   6,548                       0
<OTHER-SE>                                (23,020,653)            (14,146,617)                       0
<TOTAL-LIABILITY-AND-EQUITY>                 9,673,601              18,608,230                       0
<SALES>                                        468,220                  85,450                 327,780
<TOTAL-REVENUES>                               468,220                  85,450                 327,780
<CGS>                                                0                       0                       0
<TOTAL-COSTS>                                        0                       0                       0
<OTHER-EXPENSES>                           (9,986,010)             (5,992,813)             (5,470,334)
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                            (76,128)               (121,946)                (29,239)
<INCOME-PRETAX>                            (8,967,915)             (5,562,383)             (5,055,249)
<INCOME-TAX>                                         0                       0                       0
<INCOME-CONTINUING>                        (8,967,915)             (5,562,383)             (5,055,249)
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                               (8,967,915)             (5,562,383)             (5,055,249)
<EPS-BASIC>                                     (1.65)                  (1.16)                  (1.14)
<EPS-DILUTED>                                   (1.65)                  (1.16)                  (1.14)


</TABLE>