<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10Q
CONDENSED CONSOLIDATED BALANCE SHEET AT SEPTEMBER 30, 1997 & STATEMENT OF
OPERATIONS FOR THE THREE AND NINE MONTHS ENDING SEPTEMBER 30, 1997 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FORM 10Q SEPTEMBER 30, 1997
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JUL-01-1997
<PERIOD-END>                               SEP-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                           7,221
<SECURITIES>                                    47,093
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                36,931
<PP&E>                                          19,901
<DEPRECIATION>                                  12,120
<TOTAL-ASSETS>                                  62,767
<CURRENT-LIABILITIES>                            4,712
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           203
<OTHER-SE>                                      57,527
<TOTAL-LIABILITY-AND-EQUITY>                    62,767
<SALES>                                              0
<TOTAL-REVENUES>                                     0
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 4,078
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (2,782)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (2,782)
<EPS-PRIMARY>                                   (0.14)
<EPS-DILUTED>                                   (0.14)

<FN> 
MARKETABLE SECURITIES INCLUDES $18,006,000 IN LONG-TERM INVESTMENTS