<TABLE> <S> <C>

<PAGE>

<ARTICLE> 5
<LEGEND>
THIS (RESTATED FINANCIAL DATA) SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM FORM 10-Q/A FOR THE PERIOD ENDED SEPTEMBER 30, 1996 AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996
<PERIOD-START>                             AUG-01-1996             AUG-01-1996
<PERIOD-END>                               SEP-30-1996             SEP-30-1996
<CASH>                                       4,782,721               4,782,721
<SECURITIES>                                 3,075,796               3,075,796
<RECEIVABLES>                                4,587,996               4,587,996
<ALLOWANCES>                               (1,349,935)             (1,349,935)
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                           142,263,767             142,263,767
<PP&E>                                       6,195,106               6,195,106
<DEPRECIATION>                             (3,660,074)             (3,660,074)
<TOTAL-ASSETS>                              18,649,287              18,649,287
<CURRENT-LIABILITIES>                        6,873,100               6,873,100
<BONDS>                                              0                       0
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        81,461                  81,461
<OTHER-SE>                                  11,691,396              11,691,396
<TOTAL-LIABILITY-AND-EQUITY>                18,649,287              18,649,287
<SALES>                                      2,899,205               9,727,175
<TOTAL-REVENUES>                             2,899,205               9,727,175
<CGS>                                        1,731,597               6,261,799
<TOTAL-COSTS>                                1,731,597               6,261,799
<OTHER-EXPENSES>                             5,816,018              20,251,922
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                   0                       0
<INCOME-PRETAX>                            (4,490,375)            (16,288,488)
<INCOME-TAX>                                         0                 847,497
<INCOME-CONTINUING>                        (4,490,375)            (17,135,985)
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                               (4,490,375)            (17,135,985)
<EPS-PRIMARY>                                   (0.59)                  (2.28)
<EPS-DILUTED>                                   (0.59)                  (2.28)
        

</TABLE>