<ARTICLE> 5
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          26,420
<SECURITIES>                                    38,911<F1>
<RECEIVABLES>                                    1,157
<ALLOWANCES>                                       400
<INVENTORY>                                        775
<CURRENT-ASSETS>                                68,131
<PP&E>                                          18,445
<DEPRECIATION>                                  12,126
<TOTAL-ASSETS>                                  82,352
<CURRENT-LIABILITIES>                           14,231
<BONDS>                                         77,170
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                       136,686
<OTHER-SE>                                   (151,897)
<TOTAL-LIABILITY-AND-EQUITY>                    82,352
<SALES>                                            587
<TOTAL-REVENUES>                                 6,342
<CGS>                                              414
<TOTAL-COSTS>                                    1,960
<OTHER-EXPENSES>                                19,522
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,569
<INCOME-PRETAX>                               (15,191)
<INCOME-TAX>                                         6
<INCOME-CONTINUING>                           (15,197)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (15,197)
<EPS-PRIMARY>                                   (0.76)
<EPS-DILUTED>                                   (0.76)
<FN>
<F1>THIS AMOUNT REPRESENTS SHORT-TERM INVESTMENTS HELD BY THE COMPANY AT
JUNE 30, 1998.
</FN>