<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997
<PERIOD-START>                             APR-01-1997             JAN-01-1997
<PERIOD-END>                               JUN-30-1997             JUN-30-1997
<CASH>                                           9,033                       0
<SECURITIES>                                    46,857                       0
<RECEIVABLES>                                   12,846                       0
<ALLOWANCES>                                       860                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                70,009                       0
<PP&E>                                          14,159                       0
<DEPRECIATION>                                   5,010                       0
<TOTAL-ASSETS>                                  80,631                       0
<CURRENT-LIABILITIES>                           17,733                       0
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            14                       0
<OTHER-SE>                                      62,884                       0
<TOTAL-LIABILITY-AND-EQUITY>                    62,898                       0
<SALES>                                         12,007                  23,069
<TOTAL-REVENUES>                                17,310                  32,347
<CGS>                                              411                     797
<TOTAL-COSTS>                                    3,322                   6,198
<OTHER-EXPENSES>                                12,373                  23,260
<LOSS-PROVISION>                                    31                    (146)
<INTEREST-EXPENSE>                                  11                      33
<INCOME-PRETAX>                                  2,167                   3,886
<INCOME-TAX>                                       720                  (1,322)
<INCOME-CONTINUING>                              1,447                   2,564
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                     1,447                   2,564
<EPS-PRIMARY>                                      .10                     .18
<EPS-DILUTED>                                      .10                     .17
        

</TABLE>