<TABLE> <S> <C>

<ARTICLE>  5
<LEGEND>   This schedule contains summary financial information extracted
           from the Consolidated Balance Sheet and Consolidated Statement 
           of Operations included in the Company's Form 10-K for the year 
           ended December 31, 1997, 1996 and 1995, and is qualified in its
           entirety by reference to such Consolidated Financial Statements.
</LEGEND> 
<MULTIPLIER> 1,000 
       
<S>                                  <C>            <C>            <C>
<FISCAL-YEAR-END>                    Dec-31-1997    Dec-31-1996    Dec-31-1995
<PERIOD-START>                       Jan-01-1997    Jan-01-1996    Jan-01-1995
<PERIOD-END>                         Dec-31-1997    Dec-31-1996    Dec-31-1995
<PERIOD-TYPE>                        12-MOS         12-MOS         12-MOS
<CASH>                                 22,553,988     20,155,935       703,083
<SECURITIES>                                    0              0             0
<RECEIVABLES>                           9,610,762      5,392,177     1,226,238
<ALLOWANCES>                              461,000        100,000        25,000
<INVENTORY>                                     0              0             0
<CURRENT-ASSETS>                       34,437,820     26,388,803     4,656,804
<PP&E>                                 26,713,782     14,092,323     2,917,982
<DEPRECIATION>                          7,160,245      2,349,032       525,194
<TOTAL-ASSETS>                         58,261,678     39,841,869     4,656,804
<CURRENT-LIABILITIES>                  15,007,059      6,166,172     1,390,675
<BONDS>                                         0              0             0
<PREFERRED-MANDATORY>                           0              0             0
<PREFERRED>                                     0              0        34,392
<COMMON>                                    1,468          1,328           270
<OTHER-SE>                             40,641,336     33,096,826     2,764,128
<TOTAL-LIABILITY-AND-EQUITY>           58,261,678     39,841,869     4,656,804
<SALES>                                33,639,589     14,830,348     3,500,097
<TOTAL-REVENUES>                       33,639,589     14,830,348     3,500,097
<CGS>                                  26,717,075     15,333,504     5,632,967
<TOTAL-COSTS>                          26,717,075     15,333,504     5,632,967
<OTHER-EXPENSES>                       41,060,385     15,032,155     6,337,350
<LOSS-PROVISION>                                0              0             0
<INTEREST-EXPENSE>                        285,539        315,004       226,586
<INCOME-PRETAX>                       (24,728,092)   (16,948,662)   (8,607,358)
<INCOME-TAX>                                    0              0             0
<INCOME-CONTINUING>                   (24,728,092)   (16,948,662)   (8,607,358)
<DISCONTINUED>                                  0              0             0
<EXTRAORDINARY>                                 0              0             0
<CHANGES>                                       0              0             0
<NET-INCOME>                          (24,728,092)   (16,948,662)   (8,607,358)
<EPS-PRIMARY>                              ($1.82)        ($2.13)       ($3.19)
<EPS-DILUTED>                              ($1.82)        ($2.13)       ($3.19)
<FN>
<F1> EPS-Basic and EPS-Diluted for both 1996 and 1995 have been restated to comply
     with SFAS 128.
</FN>
        

</TABLE>