<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
QUARTERLY REPORT ON FORM 10-Q FOR THE PERIOD ENDED JUNE 30, 1998 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
<CURRENCY> US$
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<EXCHANGE-RATE>                                      1
<CASH>                                          10,502
<SECURITIES>                                     5,018
<RECEIVABLES>                                        0
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                16,584
<PP&E>                                           7,314
<DEPRECIATION>                                 (6,753)
<TOTAL-ASSETS>                                  17,145
<CURRENT-LIABILITIES>                            5,028
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            18
<OTHER-SE>                                      12,099
<TOTAL-LIABILITY-AND-EQUITY>                    17,145
<SALES>                                              0
<TOTAL-REVENUES>                                   551
<CGS>                                                0
<TOTAL-COSTS>                                    4,856
<OTHER-EXPENSES>                                   921
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                (4,440)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                            (4,440)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                   (4,440)
<EPS-PRIMARY>                                   (0.25)
<EPS-DILUTED>                                   (0.25)