<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<CASH>                                           1,412
<SECURITIES>                                     6,991
<RECEIVABLES>                                      334
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 8,815
<PP&E>                                           7,091
<DEPRECIATION>                                 (5,388)
<TOTAL-ASSETS>                                  10,554
<CURRENT-LIABILITIES>                            1,897
<BONDS>                                            870
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                        57,670
<OTHER-SE>                                    (49,883)
<TOTAL-LIABILITY-AND-EQUITY>                    10,554
<SALES>                                              0
<TOTAL-REVENUES>                                 6,328
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                14,556
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 202
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (8,430)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (8,430)
<EPS-PRIMARY>                                   (0.45)
<EPS-DILUTED>                                   (0.45)