<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
CONSOLIDATED BALANCE SHEETS AND CONSOLIDATED STATEMENTS OF OPERATIONS FOUND ON
PAGES 17 AND 18 OF THE COMPANY'S FORM 10-K FOR THE YEAR ENDED MARCH 31, 1998
PAGES 17 AND 18 OF THE COMPANY'S FORM 10-K FOR THE YEAR ENDED MARCH 31, 1997,
AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<RESTATED> 
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>                     <C>
<PERIOD-TYPE>                   12-MOS                   12-MOS                   12-MOS
<FISCAL-YEAR-END>                          MAR-31-1998             MAR-31-1997             MAR-31-1996
<PERIOD-END>                               MAR-31-1998             MAR-31-1997             MAR-31-1996
<CASH>                                          21,112                  17,349                  12,725
<SECURITIES>                                         0                       0                       0
<RECEIVABLES>                                   14,070                  12,730                  21,466
<ALLOWANCES>                                     1,364                   1,371                   1,695
<INVENTORY>                                         50                     205                     291
<CURRENT-ASSETS>                                34,656                  30,212                  34,608
<PP&E>                                          45,626                  45,829                  48,374
<DEPRECIATION>                                  42,305                  40,866                  40,574
<TOTAL-ASSETS>                                  39,388                  37,900                  48,916
<CURRENT-LIABILITIES>                           28,015                  35,717                  33,494
<BONDS>                                              0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0
<PREFERRED>                                        188                     187                      92
<COMMON>                                           182                     175                     167
<OTHER-SE>                                       8,940                 (1,134)                  15,160
<TOTAL-LIABILITY-AND-EQUITY>                    39,388                  37,900                  48,916
<SALES>                                         13,335                  18,821                  34,786
<TOTAL-REVENUES>                                52,577                  64,823                  88,557
<CGS>                                            3,966                   7,502                   6,443
<TOTAL-COSTS>                                   19,037                  28,104                  29,892
<OTHER-EXPENSES>                                31,178                  65,338                  58,549
<LOSS-PROVISION>                                     0                       0                       0
<INTEREST-EXPENSE>                                 224                     400                      40
<INCOME-PRETAX>                                  2,515                (29,550)                     341
<INCOME-TAX>                                        79                       0                      30
<INCOME-CONTINUING>                              2,436                (29,550)                     311
<DISCONTINUED>                                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0
<CHANGES>                                            0                       0                       0
<NET-INCOME>                                     2,436                (29,550)                     311
<EPS-PRIMARY>                                     0.11                 ($1.70)                    0.02
<EPS-DILUTED>                                     0.09                 ($1.70)                    0.02
        

</TABLE>