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Consolidated Statements of Cash Flows (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Operating activities    
Net income $ 2,944,149 $ 10,466,582
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation expense 834,615 722,496
Share-based compensation 393,561 628,796
Fair value adjustment of warrant liability 626,349   
Changes in operating assets and liabilities:    
Accounts receivable (235,063) (2,713,429)
Prepaid expenses (965,815) (69,231)
Accounts payable (1,940,897) (5,444,288)
Accrued expenses (297,214) 53,860
Lease exit liability (466,301) (395,694)
Deferred revenue (13,968,859) (27,935,268)
Deferred rent 87,035 404,727
Net cash used in operating activities (12,988,440) (24,281,449)
Cash flows from investing activities    
Purchases of property and equipment (2,036,700) (530,136)
Net cash used in investing activities (2,036,700) (530,136)
Cash flows from financing activities    
Proceeds from issuance of common stock 851,183 44,309
Net cash provided by financing activities 851,183 44,309
Net change in cash and cash equivalents (14,173,957) (24,767,276)
Cash and cash equivalents at beginning of period 47,743,155 55,218,361
Cash and cash equivalents at end of period $ 33,569,198 $ 30,451,085