<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEET AS OF SEPT-30-1998 AND THE RELATED STATEMENTS OF OPERATIONS FOR THE THREE
AND NINE MONTH PERIODS THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000
       
<S>                             <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   9-MOS
<FISCAL-YEAR-END>                          DEC-31-1998             DEC-31-1998
<PERIOD-START>                             JUL-01-1998             JAN-01-1998
<PERIOD-END>                               SEP-30-1998             SEP-30-1998
<CASH>                                           8,248                   8,248
<SECURITIES>                                         0                       0
<RECEIVABLES>                                    5,459                   5,459
<ALLOWANCES>                                         0                       0
<INVENTORY>                                          0                       0
<CURRENT-ASSETS>                                14,441                  14,441
<PP&E>                                          24,997                  24,997
<DEPRECIATION>                                   7,648                   7,648
<TOTAL-ASSETS>                                  32,409                  32,409
<CURRENT-LIABILITIES>                            5,355                   5,355
<BONDS>                                            886                     886
<PREFERRED-MANDATORY>                                0                       0
<PREFERRED>                                          0                       0
<COMMON>                                        37,979                  37,979
<OTHER-SE>                                    (11,812)                (11,812)
<TOTAL-LIABILITY-AND-EQUITY>                    32,409                  32,409
<SALES>                                              0                       0
<TOTAL-REVENUES>                                11,312                  31,280
<CGS>                                                0                       0
<TOTAL-COSTS>                                    5,786                  16,104
<OTHER-EXPENSES>                                 4,622                  13,099
<LOSS-PROVISION>                                     0                       0
<INTEREST-EXPENSE>                                  75                     255
<INCOME-PRETAX>                                    931                   2,070
<INCOME-TAX>                                        15                      44
<INCOME-CONTINUING>                                916                   2,026
<DISCONTINUED>                                       0                       0
<EXTRAORDINARY>                                      0                       0
<CHANGES>                                            0                       0
<NET-INCOME>                                       916                   2,026
<EPS-PRIMARY>                                     $.08                    $.18
<EPS-DILUTED>                                     $.08                    $.18
        

</TABLE>