<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONDENSED CONSOLIDATED BALANCE SHEETS AND CONDENSED CONSOLIDATED STATEMENTS OF
OPERATIONS CONTAINED IN THE COMPANY'S QUARTERLY REPORT ON FORM 10-Q FOR THE
QUARTER ENDED JUNE 30, 1997 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO 
SUCH FINANCIAL STATEMENTS AND THE NOTES THERETO
</LEGEND>
<MULTIPLIER> 1,000
       
                             
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          DEC-31-1997
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               JUN-30-1997
<CASH>                                          11,624
<SECURITIES>                                    51,086
<RECEIVABLES>                                    3,585
<ALLOWANCES>                                         0
<INVENTORY>                                      6,587
<CURRENT-ASSETS>                                78,333
<PP&E>                                          33,899
<DEPRECIATION>                                  10,457
<TOTAL-ASSETS>                                 102,165
<CURRENT-LIABILITIES>                           16,249
<BONDS>                                              0
<PREFERRED-MANDATORY>                                0
<PREFERRED>                                          0
<COMMON>                                            19
<OTHER-SE>                                      79,581
<TOTAL-LIABILITY-AND-EQUITY>                   102,165
<SALES>                                              0
<TOTAL-REVENUES>                                12,066
<CGS>                                                0
<TOTAL-COSTS>                                    5,214
<OTHER-EXPENSES>                                17,766
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 560
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                  (14,103)
<EPS-PRIMARY>                                   (0.76)
<EPS-DILUTED>                                        0