<ARTICLE>5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS FILED IN 2ND QUARTER 1997 QUARTERLY REPORT ON FORM 10Q CONDENSED
CONSOLIDATED BALANCE SHEET, STATEMENT OF OPERATIONS AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FORM 10Q JUNE 30, 1997.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             APR-01-1997
<PERIOD-END>                               JUN-30-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          19,654
<SECURITIES>                                    37,992<F1>
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                51,345
<PP&E>                                          19,881
<DEPRECIATION>                                  11,678
<TOTAL-ASSETS>                                  66,783
<CURRENT-LIABILITIES>                            6,067
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           202
<OTHER-SE>                                      60,189
<TOTAL-LIABILITY-AND-EQUITY>                    66,783
<SALES>                                              0
<TOTAL-REVENUES>                                   368
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 6,509
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (5,290)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (5,290)
<EPS-PRIMARY>                                   (0.26)
<EPS-DILUTED>                                   (0.26)
<FN>
<F1>MARKETABLE SECURITIES INCLUDES $7,186,000 IN LONG-TERM INVESTMENTS.
</FN>