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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash flows from operating activities:    
Net loss $ (50,615,729) $ (19,041,676)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 124,552 124,123
Amortization of intangible assets 1,332,680 1,370,744
Change in value of common stock warrants 39,579,704 1,067,029
Stock-based compensation 1,338,427 1,176,874
Interest income accrued on short-term investments (507) (1,148)
Deferred rent 300,273 (10,852)
(Gain) Loss on investment in affiliated entity (380,791) 817,796
Transaction costs associated with issuance of warrants 315,970 0
Gain on sale of intangible assets (1,000,000) (1,151,000)
Changes in operating assets and liabilities:    
Accounts receivable (9,743,766) (13,538)
Accounts receivable from affiliated entity 36,234 (95,914)
Prepaid expenses and other current assets (64,139) 258,328
Prepaid expenses and other current assets from affiliated entity 314,150 (245,440)
Restricted cash (264) (264)
Other assets 26,793 (14,794)
Accounts payable and accrued expenses 792,095 (860,232)
Accounts payable and accrued expenses due to affiliated entity 307,185 89,757
Deferred revenue 1,349,545 14,465
Deferred revenue from affiliated entity (268,751) (268,750)
Net cash used in operating activities (16,256,339) (16,784,492)
Cash flows from investing activities:    
Purchases of investments (5,691,902) (7,642,157)
Maturities of investments 450,507 10,008,771
Purchases of capital assets (250,597) (219,865)
Proceeds from sale of intangible assets 1,000,000 650,000
Net cash (used in) provided by investing activities (4,491,992) 2,796,749
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs 29,077,495 1,225,588
Proceeds from stock option and warrant exercises 19,092,580 0
Net cash provided by financing activities 48,170,075 1,225,588
Effect of exchange rate changes on cash and cash equivalents (344) 697
Increase (Decrease) in cash and cash equivalents 27,421,400 (12,761,458)
Cash and cash equivalents, beginning of period 5,646,021 17,350,116
Cash and cash equivalents, end of period $ 33,067,421 $ 4,588,658