<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEET ON FORM 10Q FOR THE PERIOD ENDED MAY 31, 1998 AND THE
CONSOLIDATED STATEMENT OF OPERATIONS AS FILED ON FORM 10Q FOR THE THREE AND SIX
MONTHS ENDED MAY 31, 1998 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   6-MOS
<FISCAL-YEAR-END>                          NOV-30-1998             NOV-30-1998
<PERIOD-START>                             MAR-01-1998             DEC-01-1997
<PERIOD-END>                               MAY-31-1998             MAY-31-1998
<CASH>                                           2,984                   2,984
<SECURITIES>                                    30,918                  30,918
<RECEIVABLES>                                    6,244                   6,244
<ALLOWANCES>                                       397                     397
<INVENTORY>                                        661                     661
<CURRENT-ASSETS>                                41,065                  41,065
<PP&E>                                          12,312                  12,312
<DEPRECIATION>                                   3,618                   3,618
<TOTAL-ASSETS>                                  50,352                  50,352
<CURRENT-LIABILITIES>                           16,258                  16,258
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                            83                      83
<OTHER-SE>                                      34,011                  34,011
<TOTAL-LIABILITY-AND-EQUITY>                    50,352                  50,352
<SALES>                                          9,637                  20,158
<TOTAL-REVENUES>                                 9,637                  20,158
<CGS>                                            3,759                   7,852
<TOTAL-COSTS>                                    3,759                   7,852
<OTHER-EXPENSES>                                 9,482                  17,133
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                                (3,350)                 (4,102)
<INCOME-TAX>                                         0                       0
<INCOME-CONTINUING>                            (3,350)                 (4,102)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                   (3,350)                 (4,102)
<EPS-PRIMARY>                                    (.41)                   (.50)
<EPS-DILUTED>                                    (.41)                   (.50)
        

</TABLE>