<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE 1997
FORM 10-K AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>                     <C>
<C>
<PERIOD-TYPE>                   YEAR                   YEAR                   3-MOS                   3-MOS
3-MOS
<FISCAL-YEAR-END>                          DEC-31-1995             DEC-31-1996             DEC-31-1996             DEC-31-1996
             DEC-31-1996
<PERIOD-START>                             JAN-01-1995             JAN-01-1996             JAN-01-1996             APR-01-1996
             JUL-01-1996
<PERIOD-END>                               DEC-31-1995             DEC-31-1996             MAR-31-1996             JUN-30-1996
             SEP-30-1996
<CASH>                                           1,676                     734                  27,163                  26,611
                  26,876
<SECURITIES>                                         0                  51,152                       0                       0
                       0
<RECEIVABLES>                                    3,061                   6,977                   3,360                   4,125
                   4,618
<ALLOWANCES>                                         0                     341                       0                       0
                       0
<INVENTORY>                                          0                       0                       0                       0
                       0
<CURRENT-ASSETS>                                 6,439                  61,595                  32,677                  34,068
                  33,951
<PP&E>                                           1,576                   2,396                   1,877                   2,073
                   2,183
<DEPRECIATION>                                       0                       0                       0                       0
                       0
<TOTAL-ASSETS>                                   8,107                  64,282                  34,640                  36,308
                  36,484
<CURRENT-LIABILITIES>                            4,483                   6,778                   5,124                   6,546
                   5,730
<BONDS>                                              0                       0                       0                       0
                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
                       0
<PREFERRED>                                          0                       0                       0                       0
                       0
<COMMON>                                             1                       1                       1                       1
                       1
<OTHER-SE>                                        (999)                  57,201                  29,392                  29,599
                  30,654
<TOTAL-LIABILITY-AND-EQUITY>                     8,107                  64,282                  34,640                  36,308
                  36,484
<SALES>                                         19,712                  28,367                   4,414                   5,283
                   9,544
<TOTAL-REVENUES>                                19,712                  28,367                   4,414                   5,283
                   9,544
<CGS>                                           10,253                  13,949                   1,878                   2,199
                   5,223
<TOTAL-COSTS>                                   10,253                  13,949                   1,878                   2,199
                   5,223
<OTHER-EXPENSES>                                 8,338                  12,083                   2,320                   3,041
                   3,148
<LOSS-PROVISION>                                     0                       0                       0                       0
                       0
<INTEREST-EXPENSE>                                  31                      17                       0                       0
                       0
<INCOME-PRETAX>                                  1,139                   3,193                     236                     278
                   1,381
<INCOME-TAX>                                       593                     984                      79                      74
                     449
<INCOME-CONTINUING>                                546                   2,209                     157                     204
                     932
<DISCONTINUED>                                       0                       0                       0                       0
                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
                       0
<CHANGES>                                            0                       0                       0                       0
                       0
<NET-INCOME>                                       546                   2,209                     157                     204
                     932
<EPS-PRIMARY>                                      .08                     .32                     .02                     .03
                     .13
<EPS-DILUTED>                                      .07                     .30                     .02                     .03
                     .12


</TABLE>