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Consolidated Balance Sheets (USD $)
Mar. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 198,721,816 $ 116,481,409
Accounts receivable 1,745,740 2,004,019
Prepaid expenses 1,936,505 971,705
Total current assets 202,404,061 119,457,133
Restricted cash 404,850 404,850
Property and equipment, net 5,084,289 5,035,232
Other assets 2,279,513 885,166
Total assets 210,172,713 125,782,381
Current liabilities:    
Accounts payable 5,133,050 3,169,034
Accrued expenses 2,735,153 3,583,552
Lease exit liability - current 1,487,854 1,438,742
Deferred revenue - current 19,665,764 20,267,323
Other liabilities - current 362,920 362,920
Total current liabilities 29,384,741 28,821,571
Lease exit liability, net of current portion 7,609,524 8,006,428
Deferred rent liability 2,798,537 2,904,227
Deferred revenue, net of current portion 17,160,723 7,135,687
Total liabilities 56,953,525 46,867,913
Stockholders' equity (deficit):    
Common stock, $0.01 par value - 125,000,000 shares authorized, 27,499,155 and 25,177,597 shares outstanding at March 31, 2014 and December 31, 2013, respectively 274,990 251,775
Treasury stock, at cost; no shares at March 31, 2014 and 14,381 shares at December 31, 2013   (57,742)
Additional paid-in capital 331,785,771 254,453,673
Accumulated deficit (178,841,573) (175,733,238)
Total stockholders' equity (deficit) 153,219,188 78,914,468
Total liabilities and stockholders' equity (deficit) $ 210,172,713 $ 125,782,381