<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANICAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET ON FORM 10Q FOR THE PERIOD ENDED AUGUST 31, 1998 AND
THE CONSOLIDATED STATEMENT OF OPERATIONS AS FILED ON FORM 10Q FOR THE THREE AND
NINE MONTHS ENDED AUGUST 31, 1998.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          NOV-30-1998             NOV-30-1998
<PERIOD-START>                             JUN-01-1998             DEC-01-1997
<PERIOD-END>                               AUG-31-1998             AUG-31-1998
<CASH>                                           2,957                   2,957
<SECURITIES>                                    30,999                  30,999
<RECEIVABLES>                                    5,203                   5,203
<ALLOWANCES>                                       329                     329
<INVENTORY>                                        718                     718
<CURRENT-ASSETS>                                40,367                  40,367
<PP&E>                                          12,974                  12,974
<DEPRECIATION>                                   4,374                   4,374
<TOTAL-ASSETS>                                  49,560                  49,560
<CURRENT-LIABILITIES>                           17,513                  17,513
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            83                      83
<OTHER-SE>                                      31,964                  31,964
<TOTAL-LIABILITY-AND-EQUITY>                    49,560                  49,560
<SALES>                                         10,124                  30,282
<TOTAL-REVENUES>                                10,124                  30,282
<CGS>                                            3,951                  11,803
<TOTAL-COSTS>                                    3,951                  11,803
<OTHER-EXPENSES>                                 9,079                  26,212
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                (2,419)                 (6,521)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                            (2,419)                 (6,521)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (2,419)                 (6,521)
<EPS-PRIMARY>                                    (.29)                   (.79)
<EPS-DILUTED>                                    (.29)                   (.79)
        

</TABLE>