<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM FORM 10-Q
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1998
<PERIOD-START>                             JAN-01-1998
<PERIOD-END>                               JUN-30-1998
<CASH>                                          56,353
<SECURITIES>                                    16,495
<RECEIVABLES>                                    6,699
<ALLOWANCES>                                         0
<INVENTORY>                                      4,247
<CURRENT-ASSETS>                                85,038
<PP&E>                                          10,915
<DEPRECIATION>                                   3,162
<TOTAL-ASSETS>                                  95,157
<CURRENT-LIABILITIES>                           12,357
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                           176
<OTHER-SE>                                     104,153
<TOTAL-LIABILITY-AND-EQUITY>                   112,355
<SALES>                                         17,282
<TOTAL-REVENUES>                                19,574
<CGS>                                            4,770
<TOTAL-COSTS>                                    4,770
<OTHER-EXPENSES>                                29,036
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                               (14,232)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                           (14,232)
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (14,232)
<EPS-PRIMARY>                                    (.81)
<EPS-DILUTED>                                    (.81)