<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS INCLUDED IN THIS REPORT AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                          38,596
<SECURITIES>                                    10,564
<RECEIVABLES>                                    5,861
<ALLOWANCES>                                     1,250
<INVENTORY>                                          0
<CURRENT-ASSETS>                                58,857
<PP&E>                                          18,312
<DEPRECIATION>                                  12,059
<TOTAL-ASSETS>                                  82,951
<CURRENT-LIABILITIES>                           17,031
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           340
<OTHER-SE>                                      65,580
<TOTAL-LIABILITY-AND-EQUITY>                    82,951
<SALES>                                         13,133
<TOTAL-REVENUES>                                19,256
<CGS>                                            2,344
<TOTAL-COSTS>                                    5,161
<OTHER-EXPENSES>                                25,659
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (9,486)
<INCOME-TAX>                                       150
<INCOME-CONTINUING>                            (9,636)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (9,636)
<EPS-PRIMARY>                                   (0.28)
<EPS-DILUTED>                                   (0.28)