<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
This schedule contains summary financial information extracted from the
consolidated financial statements included in this 10K and is qualified entirely
by reference to such consolidated financial statements.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996
<PERIOD-START>                             JAN-01-1997             JAN-01-1996
<PERIOD-END>                               DEC-31-1997             DEC-31-1996
<CASH>                                           2,354                   2,123
<SECURITIES>                                    21,180                     931
<RECEIVABLES>                                    6,176                   2,860
<ALLOWANCES>                                     1,245                     375
<INVENTORY>                                        360                     234
<CURRENT-ASSETS>                                30,388                   6,162
<PP&E>                                           2,515                   1,168
<DEPRECIATION>                                     727                     316
<TOTAL-ASSETS>                                  37,132                   7,044
<CURRENT-LIABILITIES>                            6,415                   2,576
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                   5,167
<PREFERRED>                                          0                       2
<COMMON>                                           125                      60
<OTHER-SE>                                      29,611                 (1,315)
<TOTAL-LIABILITY-AND-EQUITY>                    37,132                   7,044
<SALES>                                         18,541                   8,467
<TOTAL-REVENUES>                                21,573                  10,346
<CGS>                                            3,894                   1,898
<TOTAL-COSTS>                                    5,344                   2,891
<OTHER-EXPENSES>                                17,132                   6,683
<LOSS-PROVISION>                                   689                     355
<INTEREST-EXPENSE>                                  55                      27
<INCOME-PRETAX>                                  (511)                     788
<INCOME-TAX>                                       993                     244
<INCOME-CONTINUING>                            (1,504)                     544
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (1,504)                     544
<EPS-PRIMARY>                                    (.18)                     .08
<EPS-DILUTED>                                    (.18)                     .05
        

</TABLE>