<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
COMPANY'S CONSOLIDATED FINANCIAL STATEMENTS AS OF MARCH 31, 1997, JUNE 30, 1997,
SEPTEMBER 30, 1997 AND FOR THE YEAR ENDED DECEMBER 31, 1996, AND IS QUALIFIED IN
ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED>

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   YEAR                   3-MOS                   6-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1997             DEC-31-1997             DEC-31-1997
<PERIOD-START>                             JAN-01-1996             JAN-01-1997             JAN-01-1997             JAN-01-1997
<PERIOD-END>                               DEC-31-1996             MAR-31-1997             JUN-30-1997             SEP-30-1997
<CASH>                                      10,284,529               5,844,477               1,524,045               6,690,458
<SECURITIES>                                         0                       0                       0              22,040,577
<RECEIVABLES>                                  526,119                 770,344                 259,991               1,114,718
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                  1,212,825               1,729,892               2,335,479               3,832,790
<CURRENT-ASSETS>                            12,159,873               8,824,476               4,983,498              34,008,587
<PP&E>                                       1,469,782               1,822,933               3,217,639               3,771,967
<DEPRECIATION>                                 387,679                 481,797                 619,320               1,002,334
<TOTAL-ASSETS>                              14,315,717              11,225,724               8,625,906              37,777,555
<CURRENT-LIABILITIES>                        1,354,766               1,270,925               2,314,201               3,121,309
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                    115,742                 115,742                 115,742                       0
<COMMON>                                         5,382                   6,168                   6,236                 133,396
<OTHER-SE>                                  12,839,827               9,832,889               6,189,727              34,522,850
<TOTAL-LIABILITY-AND-EQUITY>                14,315,717              11,225,724               8,625,906              37,777,555
<SALES>                                      2,243,756                 829,218               1,334,662               2,563,328
<TOTAL-REVENUES>                             3,853,462                 930,706               1,478,421               3,123,703
<CGS>                                        2,252,509                 826,027               1,590,927               3,138,103
<TOTAL-COSTS>                                2,252,509                 826,027               1,590,927               3,138,103
<OTHER-EXPENSES>                             9,040,092               3,422,750               7,114,322              11,978,400
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                   0                       0                       0                       0
<INCOME-PRETAX>                            (7,439,139)             (3,318,071)             (7,226,828)            (11,992,800)
<INCOME-TAX>                                         0                       0                       0                       0
<INCOME-CONTINUING>                        (7,439,139)             (3,318,071)             (7,226,828)            (11,992,800)
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                               (7,439,139)             (3,318,071)             (7,226,828)            (11,992,800)
<EPS-PRIMARY>                                   (1.06)                  (0.37)                  (0.80)                  (1.16)
<EPS-DILUTED>                                   (1.06)                  (0.37)                  (0.80)                  (1.16)


</TABLE>