<ARTICLE> 5
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               JUN-30-1996
<CASH>                                         182,918
<SECURITIES>                                   107,481
<RECEIVABLES>                                    1,757
<ALLOWANCES>                                       220
<INVENTORY>                                          0
<CURRENT-ASSETS>                                 3,235<F1>
<PP&E>                                           7,774<F2>
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                 303,960
<CURRENT-LIABILITIES>                           14,591
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            28
<OTHER-SE>                                     287,251
<TOTAL-LIABILITY-AND-EQUITY>                   303,960
<SALES>                                          1,403
<TOTAL-REVENUES>                                 2,985
<CGS>                                              101
<TOTAL-COSTS>                                      101
<OTHER-EXPENSES>                                19,846
<LOSS-PROVISION>                                   220
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                               (22,960)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (22,960)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (22,960)
<EPS-PRIMARY>                                   (0.85)
<EPS-DILUTED>                                        0
<FN>
<F1>Current assets includes prepaid expenses and other current assets
<F2>Property, plant and equipment is net of depreciation
</FN>