<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE FORM
10-K AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL 
STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             APR-01-1997             JUL-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                           1,544                   2,777                   2,697
<SECURITIES>                                    47,941                  47,393                  48,161
<RECEIVABLES>                                    7,949                   6,737                   7,714
<ALLOWANCES>                                         0                       0                       0
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                60,998                  61,561                  62,563
<PP&E>                                           2,853                   3,479                   4,047
<DEPRECIATION>                                       0                       0                       0
<TOTAL-ASSETS>                                  64,138                  65,335                  67,269
<CURRENT-LIABILITIES>                            6,428                   6,736                   7,066
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                             1                       1                       1
<OTHER-SE>                                      57,673                  58,585                  60,097
<TOTAL-LIABILITY-AND-EQUITY>                    64,138                  65,335                  67,269
<SALES>                                          7,484                   7,517                  12,527
<TOTAL-REVENUES>                                 7,484                   7,517                  12,527
<CGS>                                            3,957                   4,050                   7,211
<TOTAL-COSTS>                                    3,957                   4,050                   7,211
<OTHER-EXPENSES>                                 3,339                   2,880                   3,943
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                                    651                   1,034                   1,867
<INCOME-TAX>                                        68                     220                     485
<INCOME-CONTINUING>                                583                     814                   1,382
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                       583                     814                   1,382
<EPS-PRIMARY>                                      .07                     .10                     .16
<EPS-DILUTED>                                      .07                     .09                     .16
        

</TABLE>