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Consolidated Statements of Cash Flows (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash flows from operating activities    
Net income (loss) $ (3,108,335) $ (3,365,901)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Depreciation expense 398,217 252,185
Share-based compensation 611,604 144,872
Fair value adjustment of warrant liabilities    30,546
Changes in operating assets and liabilities:    
Accounts receivable 258,279 (275,905)
Prepaid expenses (964,800) 80,302
Other assets (1,394,347)   
Accounts payable 1,964,016 (944,898)
Accrued expenses (848,399) 24,315
Lease exit liability (347,792) (151,995)
Deferred revenue 9,423,477 338,996
Deferred rent (105,690) 18,864
Net cash provided by (used in) operating activities 5,886,230 (3,848,619)
Cash flows from investing activities    
Purchases of property and equipment (447,275) (425,094)
Net cash used in investing activities (447,275) (425,094)
Cash flows from financing activities    
Proceeds from issuance of common stock, net of offering costs 76,801,452 56,535
Net cash provided by financing activities 76,801,452 56,535
Net change in cash and cash equivalents 82,240,407 (4,217,178)
Cash and cash equivalents at beginning of period 116,481,409 47,743,155
Cash and cash equivalents at end of period $ 198,721,816 $ 43,525,977