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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Operating activities        
Net income $ 2,944,149 $ 10,466,582 $ 8,361,755 $ 6,717,120
Adjustments to reconcile net income to net cash provided by (used in) operating activities:        
Depreciation expense 834,615 722,496 959,930 1,147,300
Share-based compensation 393,561 628,796 838,395 2,347,439
Fair value adjustment of warrant liability 626,349   (150,695) (1,459,435)
Changes in operating assets and liabilities:        
Accounts receivable (235,063) (2,713,429) 1,351,650 12,551,066
Prepaid expenses (965,815) (69,231) (91,160) 76,876
Restricted cash     177,321 (513)
Other assets     780 (133,782)
Accounts payable (1,940,897) (5,444,288) (7,312,331) (10,271,048)
Lease exit liability (466,301) (395,694) (533,560) (447,019)
Accrued expenses (297,214) 53,860 185,200 272,988
Deferred revenue (13,968,859) (27,935,268) (10,810,089) (4,275,976)
Deferred rent 87,035 404,727 440,815 232,324
Net cash used in operating activities (12,988,440) (24,281,449) (6,581,989) 6,757,340
Cash flows from investing activities        
Purchases of property and equipment (2,036,700) (530,136) (940,043) (500,213)
Net cash used in investing activities (2,036,700) (530,136) (940,043) (500,213)
Cash flows from financing activities        
Proceeds from issuance of preferred stock       12,014,816
Proceeds from issuance of common stock 851,183 44,309 46,826 70,400
Net cash provided by financing activities 851,183 44,309 46,826 12,085,216
Net change in cash and cash equivalents (14,173,957) (24,767,276) (7,475,206) 18,342,343
Cash and cash equivalents at beginning of period 47,743,155 55,218,361 55,218,361 36,876,018
Cash and cash equivalents at end of period $ 33,569,198 $ 30,451,085 $ 47,743,155 $ 55,218,361