<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM AUDITED AND
UNAUDITED INTERNAL FINANCIAL STATEMENTS AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
       
                                                  
<PERIOD-TYPE>                   12-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1998
<PERIOD-START>                             JAN-01-1997             JAN-01-1998
<PERIOD-END>                               DEC-31-1997             SEP-30-1998
<CASH>                                       3,745,851                 661,241
<SECURITIES>                                 3,537,483               3,277,083
<RECEIVABLES>                                  783,232                 329,084
<ALLOWANCES>                                    22,284                  21,209
<INVENTORY>                                    397,072                 622,805
<CURRENT-ASSETS>                             8,512,849               4,952,051
<PP&E>                                       1,967,113               2,510,074
<DEPRECIATION>                                 801,900               1,070,443
<TOTAL-ASSETS>                              10,047,468               6,767,536
<CURRENT-LIABILITIES>                          708,617                 542,589
<BONDS>                                          1,721                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        70,716                  71,923
<OTHER-SE>                                   9,266,414               6,153,024
<TOTAL-LIABILITY-AND-EQUITY>                10,047,468               6,767,536
<SALES>                                      1,686,588               1,867,864
<TOTAL-REVENUES>                             4,222,318<F1>           2,639,985
<CGS>                                        1,221,051               1,502,438
<TOTAL-COSTS>                                5,935,894               4,308,741
<OTHER-EXPENSES>                                     0                       0
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                              37,140                   1,328
<INCOME-PRETAX>                            (2,971,767)             (3,182,486)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                        (2,971,767)             (3,182,486)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                               (2,971,767)               3,182,486
<EPS-PRIMARY>                                    (.42)                   (.44)
<EPS-DILUTED>                                    (.42)                   (.44)
<FN>
<F1>Includes interest income of $505,295 for PE 12-31-97 and $244,757 for PE 
9-30-98.
</FN>