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Consolidated Balance Sheets (USD $)
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Current assets:      
Cash and cash equivalents $ 33,569,198 $ 47,743,155 $ 55,218,361
Accounts receivable 2,281,282 2,046,219 3,397,869
Prepaid expenses 1,103,449 137,634 46,474
Total current assets 36,953,929 49,927,008 58,662,704
Restricted cash 404,850 404,850 582,171
Property and equipment, net 4,469,882 3,267,796 3,287,683
Other assets 147,246 147,246 148,026
Total assets 41,975,907 53,746,900 62,680,584
Current liabilities:      
Accounts payable 1,798,228 3,739,125 11,051,456
Accrued expenses 939,811 1,237,025 1,051,825
Lease exit liability - current 1,229,454 628,768 533,560
Deferred revenue - current 21,298,318 24,123,176 31,652,533
Total current liabilities 25,265,811 29,728,094 44,289,374
Lease exit liability 8,378,184 9,445,171 10,073,939
Deferred rent liability 2,888,688 2,801,653 2,360,838
Preferred stock warrant liability 679,296 52,947 203,642
Deferred revenue, net of current portion 8,812,342 19,956,343 23,237,075
Total liabilities 46,024,321 61,984,208 80,164,868
Stockholders' equity (deficit):      
Common stock, $0.01 par value - 425,000,000 shares authorized, 1,049,030 issued and outstanding at December 31, 2011, 1,098,914 issued and outstanding at December 31, 2012, 2,124,624 issued and outstanding at September 30, 2013 and 19,196,684 at September 30, 2013 (Pro Forma) 21,246 10,989 10,490
Treasury stock, at cost; 14,381 shares at September 30, 2013 and December 31, 2012 (57,742) (57,742) (57,742)
Additional paid-in capital 165,569,134 164,334,646 163,449,924
Accumulated deficit (172,528,254) (175,472,403) (183,834,158)
Total stockholders' equity (deficit) (4,048,414) (8,237,308) (17,484,284)
Total liabilities and stockholders' equity (deficit) 41,975,907 53,746,900 62,680,584
Pro Forma [Member]
      
Stockholders' equity (deficit):      
Common stock, $0.01 par value - 425,000,000 shares authorized, 1,049,030 issued and outstanding at December 31, 2011, 1,098,914 issued and outstanding at December 31, 2012, 2,124,624 issued and outstanding at September 30, 2013 and 19,196,684 at September 30, 2013 (Pro Forma) 191,967    
Treasury stock, at cost; 14,381 shares at September 30, 2013 and December 31, 2012 (57,742)    
Additional paid-in capital 168,345,615    
Accumulated deficit (172,528,254)    
Total stockholders' equity (deficit) (4,048,414)    
Total liabilities and stockholders' equity (deficit) 41,975,907    
Series A-1 Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock 268,748 268,748 268,748
Series A-2 Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock 73,646 73,646 73,646
Series B Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock 714,012 714,012 714,012
Series C Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock 1,109,522 1,109,522 1,109,522
Series D Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock 144,462 144,462 144,462
Series D-2 Convertible Preferred Stock [Member]
      
Stockholders' equity (deficit):      
Convertible preferred stock $ 636,812 $ 636,812 $ 636,812