<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS RESTATED SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 
THE RESPECTIVE BALANCE SHEET AS OF DEC-31-1997 MAR-31-1998 AND THE RELATED 
STATEMENT OF INCOME AND CASH FLOW FOR THE RESPECTIVE PERIOD THEN ENDED.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   YEAR                    3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1998
<PERIOD-START>                             JAN-01-1997             JAN-01-1998
<PERIOD-END>                               DEC-31-1997             MAR-31-1998
<CASH>                                          19,973                  20,402
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    5,723                   6,028
<ALLOWANCES>                                       592                     592
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                26,853                  27,507
<PP&E>                                           4,340                   4,793
<DEPRECIATION>                                 (1,642)                 (1,897)
<TOTAL-ASSETS>                                  32,761                  33,484
<CURRENT-LIABILITIES>                           12,257                  11,749
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                           159                     161
<OTHER-SE>                                      20,108                  21,161
<TOTAL-LIABILITY-AND-EQUITY>                    32,761                  33,484
<SALES>                                              0                       0
<TOTAL-REVENUES>                                31,439                  10,357
<CGS>                                                0                       0
<TOTAL-COSTS>                                    1,439                     505
<OTHER-EXPENSES>                                41,753                   6,525
<LOSS-PROVISION>                                   270                       0
<INTEREST-EXPENSE>                                  12                       1
<INCOME-PRETAX>                                (5,133)                   3,615
<INCOME-TAX>                                       742                     978
<INCOME-CONTINUING>                            (5,875)                   2,637
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (5,875)                   2,637
<EPS-PRIMARY>                                   (0.41)                    0.18
<EPS-DILUTED>                                   (0.41)                    0.16
        

</TABLE>