<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS, STATEMENTS OF OPERATIONS AND STATEMENTS OF CASH
FLOWS INCLUDED IN THE COMPANY'S FORM 10-Q FOR THE PERIOD ENDED UNE 30, 1998, AND
IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS AND NOTES
THERETO.
</LEGEND>

                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1999
<PERIOD-START>                             JAN-01-1999
<PERIOD-END>                               JUN-30-1999
<CASH>                                          23,025
<SECURITIES>                                    29,330
<RECEIVABLES>                                    4,148
<ALLOWANCES>                                         0
<INVENTORY>                                        996
<CURRENT-ASSETS>                                60,650
<PP&E>                                          54,938
<DEPRECIATION>                                (32,462)
<TOTAL-ASSETS>                                  89,421
<CURRENT-LIABILITIES>                           23,139
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       290,944
<OTHER-SE>                                      39,979
<TOTAL-LIABILITY-AND-EQUITY>                    89,421
<SALES>                                          5,335
<TOTAL-REVENUES>                                20,131
<CGS>                                            1,450
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                40,418
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,011
<INCOME-PRETAX>                               (20,961)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (20,961)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (20,961)
<EPS-BASIC>                                     (0.69)
<EPS-DILUTED>                                   (0.69)