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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Cash flows from operating activities:    
Net loss $ (19,041,676) $ (9,815,906)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 124,123 101,905
Amortization of intangible assets 1,370,744 1,406,826
Change in value of common stock warrants 1,067,029 (7,577,582)
Stock-based compensation 1,176,874 1,431,976
Interest income accrued on short term investments (1,148) 6,271
Deferred rent (10,852) 1,168
Loss from investment in affiliated entity 817,796 1,550,062
Gain on sale of assets (1,151,000) (587,000)
Changes in operating assets and liabilities:    
Accounts receivable (13,538) (394,061)
Accounts receivable from affiliated entity (95,914) 43,903
Prepaid expenses and other current assets 258,328 (592,052)
Prepaid expenses and other current assets from affiliated entity (245,440) 307,174
Restricted cash (264)  
Other assets (14,794) 50,866
Accounts payable and accrued expenses (860,232) 513,939
Accounts payable and accrued expenses due to affiliated entity 89,757 (1,074,192)
Deferred revenue 14,465 (339,613)
Deferred revenue from affiliated entity (268,750) (255,208)
Net cash used in operating activities (16,784,492) (15,221,524)
Cash flows from investing activities:    
Purchases of short term investments (7,642,157) (5,768,000)
Maturities of short term investments 10,008,771 1,840,000
Purchases of capital assets (219,865) (113,964)
Proceeds from sale of intangible assets 650,000 350,000
Additional investment in affiliated entity   (101,123)
Net cash provided by (used in) investing activities 2,796,749 (3,793,087)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs 1,225,588 24,309,472
Proceeds from stock option and warrant exercises   12,930
Net cash provided by financing activities 1,225,588 24,322,402
Effect of exchange rate changes on cash and cash equivalents 697 (3,591)
(Decrease) Increase in cash and cash equivalents (12,761,458) 5,304,200
Cash and cash equivalents, beginning of period 17,350,116 19,998,489
Cash and cash equivalents, end of period $ 4,588,658 $ 25,302,689