<ARTICLE> 5
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<EXCHANGE-RATE>                                      1
<CASH>                                          14,276
<SECURITIES>                                    48,708
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                49,286
<PP&E>                                          19,854
<DEPRECIATION>                                  11,017
<TOTAL-ASSETS>                                  72,622
<CURRENT-LIABILITIES>                            6,567
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           202
<OTHER-SE>                                      65,478
<TOTAL-LIABILITY-AND-EQUITY>                    72,622
<SALES>                                              0
<TOTAL-REVENUES>                                   552
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                 7,779
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (6,336)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (6,336)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (6,336)
<EPS-PRIMARY>                                    (.31)
<EPS-DILUTED>                                    (.31)<F1>
<FN>
<F1>ITEM # 5-02(2) INCLUDES $14,450 OF LONG-TERM INVESTMENTS
</FN>