<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE
SHEETS AS OF SEP-30-1996, JUN-30-1996, MAR-31-1996 AND DEC-31-1996 AND THE
RELATED STATEMENTS OF OPERATIONS, SHAREHOLDERS' EQUITY AND CASH FLOWS FOR THE
RESPECTIVE PERIODS THEN ENDED AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO
SUCH FINANCIAL STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000

<S>                             <C>                     <C>                     <C>                     <C>
<PERIOD-TYPE>                   3-MOS                   3-MOS                   3-MOS                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996             DEC-31-1996             DEC-31-1996             DEC-31-1996
<PERIOD-START>                             JUL-01-1996             APR-01-1996             JAN-01-1996             JAN-01-1996
<PERIOD-END>                               SEP-30-1996             JUN-30-1996             MAR-31-1996             DEC-31-1996
<CASH>                                          15,913                   2,190                   1,602                  14,137
<SECURITIES>                                         0                       0                       0                       0
<RECEIVABLES>                                    2,195                   2,431                   2,874                   2,723
<ALLOWANCES>                                         0                       0                       0                       0
<INVENTORY>                                          0                       0                       0                       0
<CURRENT-ASSETS>                                18,454                   5,242                   5,070                  17,396
<PP&E>                                           9,388                   7,163                   6,620                   9,692
<DEPRECIATION>                                   2,946                   2,604                   2,321                   2,932
<TOTAL-ASSETS>                                  25,338                  10,229                   9,776                  24,529
<CURRENT-LIABILITIES>                            3,251                   2,805                   2,915                   2,380
<BONDS>                                              0                       0                       0                       0
<PREFERRED-MANDATORY>                                0                       0                       0                       0
<PREFERRED>                                          0                       0                       0                       0
<COMMON>                                        36,189                  21,509                  21,509                  36,251
<OTHER-SE>                                           0                       0                       0                       0
<TOTAL-LIABILITY-AND-EQUITY>                    25,338                  10,229                   9,776                  24,529
<SALES>                                              0                       0                       0                       0
<TOTAL-REVENUES>                                 4,417                   4,516                   4,228                  17,834
<CGS>                                                0                       0                       0                       0
<TOTAL-COSTS>                                    3,967                   3,792                   3,734                  15,949
<OTHER-EXPENSES>                                    56                     134                      47                     109
<LOSS-PROVISION>                                     0                       0                       0                       0
<INTEREST-EXPENSE>                                 147                     147                     162                     568
<INCOME-PRETAX>                                    246                     442                     285                   1,208
<INCOME-TAX>                                         4                       0                       0                      41
<INCOME-CONTINUING>                                242                     442                     285                   1,166
<DISCONTINUED>                                       0                       0                       0                       0
<EXTRAORDINARY>                                      0                       0                       0                       0
<CHANGES>                                            0                       0                       0                       0
<NET-INCOME>                                       242                     442                     285                   1,166
<EPS-PRIMARY>                                    $0.03                   $0.05                   $0.04                   $0.13
<EPS-DILUTED>                                    $0.03                   $0.05                   $0.03                   $0.12


</TABLE>