<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM 
FINANCIAL STATEMENTS FILED IN Q2 1996 QUARTERLY REPORT ON FORM 10Q, CONDENSED
CONSOLIDATED BALANCE SHEET, STATEMENT OF OPERATIONS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH 
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> US DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             APR-01-1996
<PERIOD-END>                               JUN-30-1996
<EXCHANGE-RATE>                                      1
<CASH>                                          12,317
<SECURITIES>                                    64,073
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                48,416
<PP&E>                                          19,177
<DEPRECIATION>                                   9,158
<TOTAL-ASSETS>                                  87,596
<CURRENT-LIABILITIES>                            7,947
<BONDS>                                              0
<COMMON>                                           202
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<OTHER-SE>                                      79,072
<TOTAL-LIABILITY-AND-EQUITY>                    87,596
<SALES>                                              0
<TOTAL-REVENUES>                                   625
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 7,495
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (5,593)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (5,593)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (5,593)
<EPS-PRIMARY>                                   (0.28)
<EPS-DILUTED>                                   (0.28)
<FN>
MARKETABLE SECURITIES INCLUDES $29,172 OF LONG-TERM INVESTMENTS.
</FN>