<TABLE> <S> <C>

<PAGE>
 
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED UNAUDITED FINANCIAL STATEMENTS AND RELATED NOTES
CONTAINED IN THIS FILING AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   9-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1997
<PERIOD-START>                             JAN-01-1998             JAN-01-1997
<PERIOD-END>                               SEP-30-1998             DEC-31-1997
<CASH>                                          23,391                   2,541
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    9,036                   9,327
<ALLOWANCES>                                     1,387                   1,903
<INVENTORY>                                        377                     484
<CURRENT-ASSETS>                                32,767                  11,252
<PP&E>                                           7,502                   6,497
<DEPRECIATION>                                   5,120                   4,558
<TOTAL-ASSETS>                                  45,255                  22,169
<CURRENT-LIABILITIES>                            6,116                  11,318
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                      43
<COMMON>                                           137                      69
<OTHER-SE>                                      38,705                   8,846
<TOTAL-LIABILITY-AND-EQUITY>                    45,255                  22,169
<SALES>                                         11,657                  13,521
<TOTAL-REVENUES>                                25,699                  17,545
<CGS>                                            1,494                   1,787
<TOTAL-COSTS>                                   10,768                   4,401
<OTHER-EXPENSES>                                20,146                  24,532
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                (2,768)                (11,443)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                            (2,768)                (11,443)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (2,768)                (11,443)
<EPS-PRIMARY>                                    (.43)                  (1.83)
<EPS-DILUTED>                                    (.43)                  (1.83)
        

</TABLE>