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Consolidated Balance Sheets (USD $)
Dec. 31, 2013
Dec. 31, 2012
Current assets:    
Cash and cash equivalents $ 116,481,409 $ 47,743,155
Accounts receivable 2,004,019 2,046,219
Prepaid expenses 971,705 137,634
Total current assets 119,457,133 49,927,008
Restricted cash 404,850 404,850
Property and equipment, net 5,035,232 3,267,796
Other assets 885,166 147,246
Total assets 125,782,381 53,746,900
Current liabilities:    
Accounts payable 3,169,034 3,739,125
Accrued expenses 3,583,552 1,237,025
Lease exit liability-current 1,438,742 628,768
Deferred revenue-current 20,267,323 24,123,176
Other liabilities-current 362,920  
Total current liabilities 28,821,571 29,728,094
Lease exit liability, net of current portion 8,006,428 9,445,171
Deferred rent liability 2,904,227 2,801,653
Preferred stock warrant liability   52,947
Deferred revenue, net of current portion 7,135,687 19,956,343
Total liabilities 46,867,913 61,984,208
Stockholders' equity (deficit):    
Common stock, $0.01 par value-125,000,000 shares authorized and 25,177,597 shares outstanding at December 31, 2013; 425,000,000 shares authorized and 1,098,914 shares outstanding at December 31, 2012 251,775 10,989
Treasury stock, at cost; 14,381 shares at December 31, 2013 and December 31, 2012 (57,742) (57,742)
Additional paid-in capital 254,453,673 164,334,646
Accumulated deficit (175,733,238) (175,472,403)
Total stockholders' equity (deficit) 78,914,468 (8,237,308)
Total liabilities and stockholders' equity (deficit) 125,782,381 53,746,900
Series A-1 Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   268,748
Series A-2 Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   73,646
Series B Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   714,012
Series C Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   1,109,522
Series D-1 Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   144,462
Series D-2 Convertible Preferred Stock [Member]
    
Stockholders' equity (deficit):    
Convertible preferred stock   $ 636,812