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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Cash flows from operating activities:    
Net loss $ (12,409,187) $ (5,259,325)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 77,187 66,641
Amortization of intangible assets 917,366 940,566
Change in value of common stock warrants (46,609) (7,230,626)
Stock-based compensation 877,511 1,150,272
Interest income accrued on short term investments (847) 6,271
Deferred rent (5,651) (958)
Loss from investment in affiliated entity 1,553,917 2,977,238
Gain on sale of assets (651,000) (250,000)
Changes in operating assets and liabilities:    
Accounts receivable 35,801 (314,932)
Accounts receivable from affiliated entity 4,960 (18,272)
Prepaid expenses and other current assets 147,567 (548,252)
Prepaid expenses and other current assets from affiliated entity (372,749) (338,809)
Restricted cash (175)  
Other assets (14,794) 50,866
Accounts payable and accrued expenses (694,999) 80,476
Accounts payable and accrued expenses due to affiliated entity 33,269 (923,458)
Deferred revenue (40,445) (193,872)
Deferred revenue from affiliated entity (162,500) (148,958)
Net cash used in operating activities (10,751,378) (9,955,132)
Cash flows from investing activities:    
Purchases of short term investments (6,318,920) (5,766,000)
Maturities of short term investments 5,725,233 1,840,000
Purchases of capital assets (202,921) (95,959)
Proceeds from sale of intangible assets 150,000 250,000
Net cash used in investing activities (646,608) (3,771,959)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs   24,309,472
Proceeds from stock option and warrant exercises   12,930
Net cash provided by financing activities   24,322,402
Effect of exchange rate changes on cash and cash equivalents 13 493
(Decrease) Increase in cash and cash equivalents (11,397,973) 10,595,804
Cash and cash equivalents, beginning of period 17,350,116 19,998,489
Cash and cash equivalents, end of period $ 5,952,143 $ 30,594,293