<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM COMPANY'S
FORM 10Q FOR THE QUARTER ENDED MARCH 31, 1998 FILED MAY 14, 1997 WITH SECURITIES
AND EXCHANGE COMMISSION AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
10Q.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               MAR-31-1998
<CASH>                                          31,163
<SECURITIES>                                    14,779
<RECEIVABLES>                                    3,560
<ALLOWANCES>                                      (78)
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 1,035
<PP&E>                                          16,324
<DEPRECIATION>                                (12,919)
<TOTAL-ASSETS>                                  55,811
<CURRENT-LIABILITIES>                            6,383
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           106
<OTHER-SE>                                      48,797
<TOTAL-LIABILITY-AND-EQUITY>                    55,811
<SALES>                                              0
<TOTAL-REVENUES>                                 6,167
<CGS>                                                0
<TOTAL-COSTS>                                    2,166
<OTHER-EXPENSES>                                   600
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  47
<INCOME-PRETAX>                                    947
<INCOME-TAX>                                         7
<INCOME-CONTINUING>                                940
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                       940
<EPS-PRIMARY>                                     0.09
<EPS-DILUTED>                                     0.09