<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 SEPTEMBER 30, 1998 AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998
<PERIOD-START>                             JUL-01-1998             JAN-01-1998
<PERIOD-END>                               SEP-30-1998             SEP-30-1998
<CASH>                                          16,291                       0
<SECURITIES>                                    80,858                       0
<RECEIVABLES>                                   28,396                       0
<ALLOWANCES>                                     2,683                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                               130,030                       0
<PP&E>                                          24,157                       0
<DEPRECIATION>                                  10,871                       0
<TOTAL-ASSETS>                                 148,807                       0
<CURRENT-LIABILITIES>                           39,382                       0
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            17                       0
<OTHER-SE>                                     132,550                       0
<TOTAL-LIABILITY-AND-EQUITY>                   148,807                       0
<SALES>                                         21,562                  57,329
<TOTAL-REVENUES>                                33,883                  87,392
<CGS>                                              944                   2,851
<TOTAL-COSTS>                                    8,216                  21,129
<OTHER-EXPENSES>                                56,471                  93,151
<LOSS-PROVISION>                                    36                     687
<INTEREST-EXPENSE>                                   5                      21
<INCOME-PRETAX>                                (29,692)                (23,632)
<INCOME-TAX>                                     1,676                   4,075
<INCOME-CONTINUING>                            (31,368)                (27,707)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (31,368)                (27,707)
<EPS-PRIMARY>                                    (1.90)                  (1.72)
<EPS-DILUTED>                                    (1.90)                  (1.72)
        

</TABLE>