<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<RESTATED>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>                     <C>
<C>
<PERIOD-TYPE>                   YEAR                   9-MOS                   6-MOS                   3-MOS
YEAR
<FISCAL-YEAR-END>                          MAR-31-1998             MAR-31-1998             MAR-31-1998             MAR-31-1998
             MAR-31-1997
<PERIOD-START>                             APR-01-1997             APR-01-1997             APR-01-1997             APR-01-1997
             APR-01-1996
<PERIOD-END>                               MAR-31-1998             DEC-31-1997             SEP-30-1997             JUN-30-1997
             MAR-31-1997
<CASH>                                          34,193                  43,065                   2,475                   4,283
                   7,173
<SECURITIES>                                     2,872                   3,493                   8,135                   8,467
                  13,618
<RECEIVABLES>                                   11,810                  12,834                   3,396                   3,463
                   3,598
<ALLOWANCES>                                        27                     131                     258                     350
                     539
<INVENTORY>                                          0                       0                       0                       0
                       0
<CURRENT-ASSETS>                                49,947                  59,891                  43,024                  51,283
                  58,640
<PP&E>                                          20,657                  30,132                  29,241                  27,947
                  19,414
<DEPRECIATION>                                   1,630                   1,616                   1,394                   1,172
                   1,024
<TOTAL-ASSETS>                                 119,303                 124,180                 149,264                 159,458
                 158,437
<CURRENT-LIABILITIES>                            9,326                  11,698                  52,525                  39,119
                  12,222
<BONDS>                                         22,923                  28,092                  28,059                  32,589
                  27,482
<PREFERRED-MANDATORY>                          214,996                 208,364                 201,889                 195,567
                 189,402
<PREFERRED>                                          0                       0                       0                       0
                       0
<COMMON>                                        69,032                  69,032                  69,032                  69,032
                  69,030
<OTHER-SE>                                   (210,934)               (221,985)               (237,829)               (227,781)
               (182,537)
<TOTAL-LIABILITY-AND-EQUITY>                   119,303                 124,180                 149,264                 159,458
                 158,437
<SALES>                                              0                       0                       0                       0
                       0
<TOTAL-REVENUES>                                     0                       0                       0                       0
                       0
<CGS>                                                0                       0                       0                       0
                       0
<TOTAL-COSTS>                                        0                       0                       0                       0
                       0
<OTHER-EXPENSES>                                     0                       0                       0                       0
                       0
<LOSS-PROVISION>                                     0                       0                       0                       0
                       0
<INTEREST-EXPENSE>                               3,048                   2,581                   1,683                     814
                   4,146
<INCOME-PRETAX>                               (81,811)                (97,573)                (38,930)                (37,401)
                  10,426
<INCOME-TAX>                                      (40)                    (42)                     (1)                     (2)
                  29,839
<INCOME-CONTINUING>                           (81,771)                (97,531)                (38,929)                (37,399)
                (19,413)
<DISCONTINUED>                                   4,271                   3,543                     398                     433
               (259,943)
<EXTRAORDINARY>                                      0                       0                       0                       0
                       0
<CHANGES>                                            0                       0                       0                       0
                       0
<NET-INCOME>                                  (77,500)                (93,988)                (38,531)                (36,946)
               (279,356)
<EPS-BASIC>                                     (7.47)                  (8.18)                  (3.70)                  (3.12)
                 (19.99)
<EPS-DILUTED>                                   (7.47)                  (8.18)                  (3.70)                  (3.12)
                 (19.99)


</TABLE>