<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 10-Q
MARCH 31, 1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH 10-Q.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1996
<PERIOD-END>                               MAR-31-1996
<EXCHANGE-RATE>                                      1
<CASH>                                          20,178
<SECURITIES>                                    57,078
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                78,586
<PP&E>                                          25,297
<DEPRECIATION>                                  17,706
<TOTAL-ASSETS>                                  90,320
<CURRENT-LIABILITIES>                            7,519
<BONDS>                                              0
<COMMON>                                           174
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                      78,256
<TOTAL-LIABILITY-AND-EQUITY>                    90,320
<SALES>                                              0
<TOTAL-REVENUES>                                 3,751
<CGS>                                                0
<TOTAL-COSTS>                                   11,100
<OTHER-EXPENSES>                                     0
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 119
<INCOME-PRETAX>                                (7,468)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (7,468)
<EPS-PRIMARY>                                   (0.43)
<EPS-DILUTED>                                        0