<ARTICLE>5

                                                                                                      
<PERIOD-TYPE>                                                                3-MOS             12-MOS           3-mos
<FISCAL-YEAR-END>                                                            Dec-31-1995       Dec-31-1996      Dec-31-1996
<PERIOD-END>                                                                 Sep-30-1996       Dec-31-1996      Mar-31-1997
<CASH>                                                                            1,199             1,213            5,188
<SECURITIES>                                                                     45,091            45,447           34,097
<RECEIVABLES>                                                                         0                 0                0
<ALLOWANCES>                                                                          0                 0                0
<INVENTORY>                                                                           0                 0                0
<CURRENT-ASSETS>                                                                 47,233            48,002           40,438
<PP&E>                                                                           29,057            29,191           29,348
<DEPRECIATION>                                                                   23,725            24,093           24,581
<TOTAL-ASSETS>                                                                   57,140            57,675           49,780
<CURRENT-LIABILITIES>                                                             7,052             8,679            8,398
<BONDS>                                                                               0                 0                0
<COMMON>                                                                             16                20               20
<PREFERRED-MANDATORY>                                                                 0                 0                0
<PREFERRED>                                                                           1                 0                0
<OTHER-SE>                                                                       44,239            34,728           26,755
<TOTAL-LIABILITY-AND-EQUITY>                                                     57,140            57,675           49,780
<SALES>                                                                               0                 0                0
<TOTAL-REVENUES>                                                                    544             3,604              674
<CGS>                                                                                 0                 0                0
<TOTAL-COSTS>                                                                         0                 0                0
<OTHER-EXPENSES>                                                                  8,401            31,826            9,048
<LOSS-PROVISION>                                                                      0             2,500                0
<INTEREST-EXPENSE>                                                                  104               519              282
<INCOME-PRETAX>                                                                  (7,457)          (29,110)          (8,014)
<INCOME-TAX>                                                                          0                 0                0
<INCOME-CONTINUING>                                                              (7,457)          (29,110)          (8,014)
<DISCONTINUED>                                                                        0                 0                0
<EXTRAORDINARY>                                                                       0                 0                0
<CHANGES>                                                                             0                 0                0
<NET-INCOME>                                                                     (7,457)          (29,110)          (8,014)
<EPS-BASIC>                                                                       (0.22)            (0.90)           (0.20)
<EPS-DILUTED>                                                                     (0.22)            (0.90)           (0.20)