<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED BALANCE SHEETS, STATEMENTS OF OPERATIONS, AND STATEMENTS OF CASH FLOWS
INCLUDED IN THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND THE
NOTES THERETO.
</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>                                          11,431
<SECURITIES>                                    73,071
<RECEIVABLES>                                      780
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                               101,144
<PP&E>                                          24,732
<DEPRECIATION>                                (18,961)
<TOTAL-ASSETS>                                 106,915
<CURRENT-LIABILITIES>                           20,289
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             2
<OTHER-SE>                                      84,496
<TOTAL-LIABILITY-AND-EQUITY>                   106,915
<SALES>                                              0
<TOTAL-REVENUES>                                32,923
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                30,729
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 462
<INCOME-PRETAX>                                  3,953
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                              3,953
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     3,953
<EPS-PRIMARY>                                      .16<F1>
<EPS-DILUTED>                                      .16
<FN>
<F1>FOR THE PURPOSES OF THIS EXHIBIT, PRIMARY MEANS BASIC.
</FN>