<TABLE> <S> <C>
<PAGE>
<ARTICLE> 5
<MULTIPLIER> 1,000
<S> <C> <C>
<PERIOD-TYPE> YEAR YEAR
<FISCAL-YEAR-END> MAR-31-2000 MAR-31-1999
<PERIOD-START> APR-01-1999 APR-01-1998
<PERIOD-END> MAR-31-2000 MAR-31-1999
<CASH> 126,918 24,969
<SECURITIES> 91,737 6,602
<RECEIVABLES> 7,317 4,099
<ALLOWANCES> 0 0
<INVENTORY> 9,247 5,025
<CURRENT-ASSETS> 144,291 34,631
<PP&E> 24,978 19,060
<DEPRECIATION> (15,199) (12,946)
<TOTAL-ASSETS> 248,914 48,130
<CURRENT-LIABILITIES> 6,710 4,172
<BONDS> 0 0
0 0
0 0
<COMMON> 197 154
<OTHER-SE> 240,747 43,805
<TOTAL-LIABILITY-AND-EQUITY> 248,914 48,130
<SALES> 4,621 1,888
<TOTAL-REVENUES> 15,113 11,257
<CGS> 4,383 1,914
<TOTAL-COSTS> 14,694 12,021
<OTHER-EXPENSES> 19,892 16,488
<LOSS-PROVISION> 0 0
<INTEREST-EXPENSE> 0 (10)
<INCOME-PRETAX> (17,598) (15,326)
<INCOME-TAX> 0 0
<INCOME-CONTINUING> (17,598) (15,326)
<DISCONTINUED> 0 0
<EXTRAORDINARY> 0 0
<CHANGES> 0 0
<NET-INCOME> (17,598) (15,326)
<EPS-BASIC> (1.11) (1.01)
<EPS-DILUTED> (1.11) (1.01)
</TABLE>