<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM COMPANY'S
FORM 10-Q FOR THE 6 MONTHS ENDED JUNE 30, 1998 FILED AUGUST 13, 1998 WITH
SECURITIES AND EXCHANGE COMMISSION AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          36,812
<SECURITIES>                                    10,505
<RECEIVABLES>                                    3,759
<ALLOWANCES>                                      (78)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                52,172
<PP&E>                                          16,864
<DEPRECIATION>                                (13,638)
<TOTAL-ASSETS>                                  57,932
<CURRENT-LIABILITIES>                            6,966
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           106
<OTHER-SE>                                      50,462
<TOTAL-LIABILITY-AND-EQUITY>                    57,932
<SALES>                                              0
<TOTAL-REVENUES>                                12,949
<CGS>                                                0
<TOTAL-COSTS>                                    4,574
<OTHER-EXPENSES>                                 1,225
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  88
<INCOME-PRETAX>                                  2,329
<INCOME-TAX>                                        32
<INCOME-CONTINUING>                              2,297
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     2,297
<EPS-PRIMARY>                                     0.22
<EPS-DILUTED>                                     0.21