<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM BALANCE
SHEETS AT DEC. 31, 1998 AND 1997 AND STATEMENTS OF OPERATIONS FOR THE YEARS
THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               DEC-31-1998             DEC-31-1997
<CASH>                                          20,363                  27,912
<SECURITIES>                                    26,501                     750
<RECEIVABLES>                                    2,543                     589
<ALLOWANCES>                                      (120)                    (40)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                52,428                  38,877
<PP&E>                                           6,491                   3,868
<DEPRECIATION>                                  (2,367)                   (890)
<TOTAL-ASSETS>                                  72,168                  41,855
<CURRENT-LIABILITIES>                            7,226                   4,876
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            14                      11
<OTHER-SE>                                      62,673                  35,354
<TOTAL-LIABILITY-AND-EQUITY>                    72,168                  41,855
<SALES>                                         14,008                   6,010
<TOTAL-REVENUES>                                14,008                   6,010
<CGS>                                            6,093                   3,648
<TOTAL-COSTS>                                   32,578                  12,470
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                               2,636                     266
<INCOME-PRETAX>                                (22,027)                 (9,842)
<INCOME-TAX>                                       (51)                     (2)
<INCOME-CONTINUING>                            (22,078)                 (9,844)
<DISCONTINUED>                                  (4,883)                   (324)
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (26,961)                (10,168)
<EPS-PRIMARY>                                    (2.11)                  (3.54)
<EPS-DILUTED>                                    (2.11)                  (3.54)
        

</TABLE>