<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FINANCIAL
STATEMENTS AT 12/31/97 FILED IN THE 1997 FORM 10K; CONSOLIDATED BALANCE SHEET,
STATEMENT OF OPERATIONS FOR THE YEAR ENDED 12/31/97 AND IS QUALIFIED IN ITS
ENTIRETY BY REFERENCE TO SUCH FORM 10K, DECEMBER 31, 1997.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
<CURRENCY> U.S. DOLLARS
       
                             
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               DEC-31-1997
<EXCHANGE-RATE>                                      1
<CASH>                                           8,437
<SECURITIES>                                    43,856<F1>
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                28,066
<PP&E>                                          19,899
<DEPRECIATION>                                (13,214)
<TOTAL-ASSETS>                                  59,588
<CURRENT-LIABILITIES>                            5,244
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           203
<OTHER-SE>                                      53,816
<TOTAL-LIABILITY-AND-EQUITY>                    59,588
<SALES>                                              0
<TOTAL-REVENUES>                                 2,049
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                23,492
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                               (18,119)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (18,119)
<EPS-PRIMARY>                                   (0.89)
<EPS-DILUTED>                                   (0.89)

<FN>
<F1> Marketable securities includes long term investments
     of $24,788.
</FN>