<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S 10-Q FOR THE PERIOD ENDED SEPTEMBER 30, 1996 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENT.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JUL-01-1996             JAN-01-1996
<PERIOD-END>                               SEP-30-1996             SEP-30-1996
<CASH>                                               0                   8,139
<SECURITIES>                                         0                  46,836
<RECEIVABLES>                                        0                   8,267
<ALLOWANCES>                                         0                    (788)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                     0                  63,402
<PP&E>                                               0                   8,153
<DEPRECIATION>                                       0                   2,866
<TOTAL-ASSETS>                                       0                  69,095
<CURRENT-LIABILITIES>                                0                  12,645
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                             0                      14
<OTHER-SE>                                           0                  56,092
<TOTAL-LIABILITY-AND-EQUITY>                         0                  69,095
<SALES>                                          9,127                  23,768
<TOTAL-REVENUES>                                12,036                  30,925
<CGS>                                              476                   1,397
<TOTAL-COSTS>                                    2,208                   6,049
<OTHER-EXPENSES>                                 8,408                  22,220
<LOSS-PROVISION>                                    16                      25
<INTEREST-EXPENSE>                                  31                     101
<INCOME-PRETAX>                                  2,080                   4,233
<INCOME-TAX>                                      (728)                 (1,482)
<INCOME-CONTINUING>                              1,352                   2,751
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     1,352                   2,751
<EPS-PRIMARY>                                      .10                     .20
<EPS-DILUTED>                                      .09                     .19
        

</TABLE>