<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM SEPTEMBER
30, 2000 FORM 10-Q AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH
FINANCIAL STATEMENTS.
</LEGEND>
<S> <C>
<PERIOD-TYPE> 9-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-2000
<PERIOD-END> SEP-30-2000
<CASH> 135,601,320
<SECURITIES> 27,054,594
<RECEIVABLES> 0
<ALLOWANCES> 0
<INVENTORY> 0
<CURRENT-ASSETS> 164,011,289
<PP&E> 16,797,543
<DEPRECIATION> 12,819,438
<TOTAL-ASSETS> 198,021,740
<CURRENT-LIABILITIES> 8,919,018
<BONDS> 0
0
1,510,280
<COMMON> 363,923,329
<OTHER-SE> (177,882,715)
<TOTAL-LIABILITY-AND-EQUITY> 198,021,740
<SALES> 0
<TOTAL-REVENUES> 0
<CGS> 0
<TOTAL-COSTS> 38,364,309
<OTHER-EXPENSES> 0
<LOSS-PROVISION> 0
<INTEREST-EXPENSE> 449,900
<INCOME-PRETAX> (37,261,217)
<INCOME-TAX> 0
<INCOME-CONTINUING> 0
<DISCONTINUED> 0
<EXTRAORDINARY> 0
<CHANGES> 0
<NET-INCOME> (37,261,217)
<EPS-BASIC> (1.61)
<EPS-DILUTED> (1.61)
</TABLE>