<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5

<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          DEC-31-1997             DEC-31-1996             DEC-31-1995
<PERIOD-START>                             JAN-01-1997             JAN-01-1996             JAN-01-1995
<PERIOD-END>                               DEC-31-1997             DEC-31-1996             DEC-31-1995
<CASH>                                           6,679                  20,774                  33,338
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                    2,970                   9,852                   6,377
<ALLOWANCES>                                     2,975                   1,191                     605
<INVENTORY>                                        267                   2,323                   2,834
<CURRENT-ASSETS>                                14,179                  35,486                  43,923
<PP&E>                                           2,150                   5,841                   4,041
<DEPRECIATION>                                   3,477                   4,527                   2,069
<TOTAL-ASSETS>                                  17,382                  44,142                  50,173
<CURRENT-LIABILITIES>                           10,376                  10,139                   8,361
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                          0                       0                       0
<COMMON>                                           122                     110                     102
<OTHER-SE>                                       6,874                  33,383                  40,204
<TOTAL-LIABILITY-AND-EQUITY>                    17,382                  44,142                  50,173
<SALES>                                         36,630                  50,165                  43,381
<TOTAL-REVENUES>                                41,282                  51,792                  44,121
<CGS>                                            9,315                  11,951                   8,199
<TOTAL-COSTS>                                   40,134                  38,039                  31,182
<OTHER-EXPENSES>                                26,838                  18,700                       0
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0
<INCOME-PRETAX>                               (34,772)                (15,764)                   5,294
<INCOME-TAX>                                         0                      97                   1,622
<INCOME-CONTINUING>                           (34,772)                (15,861)                   3,672
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                         0                       0                       0
<EPS-PRIMARY>                                   (2.88)                  (1.46)                    0.52
<EPS-DILUTED>                                   (2.88)                  (1.46)                    0.40


</TABLE>