<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C> <C> <C> <C>
<PERIOD-TYPE> 6-MOS 12-MOS 12-MOS 12-MOS
<FISCAL-YEAR-END> DEC-31-2000 DEC-31-1999 DEC-31-1998 DEC-31-1997
<PERIOD-START> JAN-01-2000 JAN-01-1999 JAN-01-1998 JAN-01-1997
<PERIOD-END> JUN-30-2000 DEC-31-1999 DEC-31-1998 DEC-31-1997
<CASH> 6,174 10,568 22,975 13,179
<SECURITIES> 3,032 6,835 10,980 2,946
<RECEIVABLES> 799 444 19 0
<ALLOWANCES> (50) (30) 0 0
<INVENTORY> 1,762 2,301 68 0
<CURRENT-ASSETS> 13,884 20,366 35,236 16,240
<PP&E> 5,082 4,108 3,048 1,354
<DEPRECIATION> (2,481) (2,015) (1,077) (500)
<TOTAL-ASSETS> 16,660 22,634 37,391 17,256
<CURRENT-LIABILITIES> 7,370 3,285 1,207 270
<BONDS> 0 0 0 0
0 0 0 0
49,611 49,611 49,611 21,128
<COMMON> 12 11 11 10
<OTHER-SE> (40,333) (30,273) (13,438) (4,182)
<TOTAL-LIABILITY-AND-EQUITY> 16,660 22,634 37,391 17,256
<SALES> 2,724 648 180 0
<TOTAL-REVENUES> 2,724 648 180 0
<CGS> (4,013) (2,420) (196) 0
<TOTAL-COSTS> (20,449) (31,298) (34,643) (3,213)
<OTHER-EXPENSES> 0 0 0 0
<LOSS-PROVISION> 0 0 0 0
<INTEREST-EXPENSE> 0 0 0 0
<INCOME-PRETAX> (21,315) (31,702) (33,657) (2,771)
<INCOME-TAX> 0 0 0 0
<INCOME-CONTINUING> 0 0 0 0
<DISCONTINUED> 0 0 0 0
<EXTRAORDINARY> 0 0 0 0
<CHANGES> 0 0 0 0
<NET-INCOME> (21,315) (31,702) (33,657) (2,771)
<EPS-BASIC> (1.87) (2.98) (3.32) (0.28)
<EPS-DILUTED> (1.87) (2.98) (3.32) (0.28)
</TABLE>