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Consolidated Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating activities      
Net income (loss) $ (260,835) $ 8,361,755 $ 6,717,120
Adjustments to reconcile net income to net cash provided by (used in) operating activities:      
Depreciation expense 1,193,340 959,930 1,147,300
Share-based compensation 862,162 838,395 2,347,439
Fair value adjustment of warrant liability 626,349 (150,695) (1,459,435)
Changes in operating assets and liabilities:      
Accounts receivable 42,200 1,351,650 12,551,066
Prepaid expenses (834,071) (91,160) 76,876
Restricted cash   177,321 (513)
Other assets (375,000) 780 (133,782)
Accounts payable (570,091) (7,312,331) (10,271,048)
Accrued expenses 2,346,527 185,200 272,988
Lease exit liability (628,769) (533,560) (447,019)
Deferred revenue (16,676,509) (10,810,089) (4,275,976)
Deferred rent 102,574 440,815 232,324
Net cash (used in) provided by operating activities (14,172,123) (6,581,989) 6,757,340
Cash flows from investing activities      
Purchases of property and equipment (2,960,776) (940,043) (500,213)
Net cash used in investing activities (2,960,776) (940,043) (500,213)
Cash flows from financing activities      
Proceeds from issuance of preferred stock     12,014,816
Proceeds from issuance of common stock, net of offering costs 85,871,153 46,826 70,400
Net cash provided by financing activities 85,871,153 46,826 12,085,216
Net change in cash and cash equivalents 68,738,254 (7,475,206) 18,342,343
Cash and cash equivalents at beginning of period 47,743,155 55,218,361 36,876,018
Cash and cash equivalents at end of period 116,481,409 47,743,155 55,218,361
Noncash financing activities:      
Conversion of preferred stock $ 2,947,202