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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net loss $ (28,727,646) $ (50,615,729)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 428,801 124,552
Amortization of intangible assets 712,121 1,332,680
Change in value of common stock warrants (204,484) 39,579,704
Stock-based compensation 4,548,445 1,338,427
Issuance of shares in connection with reverse stock split 57,187 0
Interest income accrued on short-term investments 0 (507)
Deferred rent 589,109 300,273
Loss on disposal of fixed assets 2,959 0
Loss on short-term investments 1,500 0
Loss (gain) on investment in affiliated entity 666,212 (380,791)
Transaction costs associated with issuance of warrants 0 315,970
Gain on sale of intangible assets 0 (1,000,000)
Changes in operating assets and liabilities:    
Accounts receivable 1,679,569 (9,743,766)
Accounts receivable from affiliated entity 0 36,234
Prepaid expenses and other current assets 51,758 (64,139)
Prepaid expenses and other current assets from affiliated entity 468,147 314,150
Restricted cash 100,762 (264)
Other assets 0 26,793
Accounts payable and accrued expenses (970,886) 792,095
Accounts payable and accrued expenses due to affiliated entity (428,005) 307,185
Deferred revenue (468,404) 1,349,545
Deferred revenue from affiliated entity (256,251) (268,751)
Net cash used in operating activities (21,749,106) (16,256,339)
Cash flows from investing activities:    
Purchases of investments (19,288,154) (5,691,902)
Maturities of investments 7,900,855 450,507
Purchases of capital assets (1,207,874) (250,597)
Proceeds from sale of intangible assets 0 1,000,000
Net cash used in investing activities (12,595,173) (4,491,992)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs 59,209,182 29,077,495
Proceeds from stock option and warrant exercises 12,085,990 19,092,580
Net cash provided by financing activities 71,295,172 48,170,075
Effect of exchange rate changes on cash and cash equivalents (1,689) (344)
Increase in cash and cash equivalents 36,949,204 27,421,400
Cash and cash equivalents, beginning of period 33,719,796 5,646,021
Cash and cash equivalents, end of period 70,669,000 33,067,421
Supplemental disclosure of non-cash activities    
Lease incentive recorded as fixed assets and deferred rent $ 933,350 $ 0