<TABLE> <S> <C>

<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY  BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                          31,441                  29,671                  20,537
<SECURITIES>                                     1,495                   8,140                  17,678
<RECEIVABLES>                                   20,431                  20,008                  24,035
<ALLOWANCES>                                         0                     774                   1,074
<INVENTORY>                                          0                       0                       0
<CURRENT-ASSETS>                                58,432                  58,970                  62,468
<PP&E>                                          12,774                  13,281                  14,687
<DEPRECIATION>                                   4,108                   4,549                   5,249
<TOTAL-ASSETS>                                  69,641                  71,915                  77,862
<CURRENT-LIABILITIES>                           20,631                  20,200                  25,691
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                             2                       2                       2
<OTHER-SE>                                      49,008                  51,713                  52,169
<TOTAL-LIABILITY-AND-EQUITY>                    69,641                  71,915                  77,862
<SALES>                                         13,008                  25,454                  39,400
<TOTAL-REVENUES>                                19,360                  38,789                  60,680
<CGS>                                              520                   1,011                   1,596
<TOTAL-COSTS>                                    4,497                   9,142                  14,480
<OTHER-EXPENSES>                                12,125                  25,622                  42,070
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                               (362)                   (692)                 (1,052)
<INCOME-PRETAX>                                  3,100                   4,717                   5,182
<INCOME-TAX>                                     1,147                   1,746                   1,918
<INCOME-CONTINUING>                              1,953                   2,971                   3,264
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     1,953                   2,971                   3,264
<EPS-PRIMARY>                                     0.10                    0.15                    0.16
<EPS-DILUTED>                                     0.09                    0.14                    0.15
        

</TABLE>