<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED BALANCE SHEET, STATEMENT OF OPERATIONS AND STATEMENT OF CASH FLOWS
INCLUDED WITH THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDED SEPTEMBER 30, 1997
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENT AND
THE NOTES THERETO.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               SEP-30-1997
<CASH>                                           5,668
<SECURITIES>                                    20,913
<RECEIVABLES>                                    6,556
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                36,108
<PP&E>                                          21,551
<DEPRECIATION>                                (16,546)
<TOTAL-ASSETS>                                  41,113
<CURRENT-LIABILITIES>                           14,526
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                             2
<OTHER-SE>                                      24,264
<TOTAL-LIABILITY-AND-EQUITY>                    41,113
<SALES>                                              0
<TOTAL-REVENUES>                                15,816
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                44,502
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 496
<INCOME-PRETAX>                               (27,498)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (27,498)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (27,498)
<EPS-PRIMARY>                                   (1.37)
<EPS-DILUTED>                                   (1.37)