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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from operating activities:    
Net loss $ (19,724,876) $ (12,409,187)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 81,020 77,187
Amortization of intangible assets 893,028 917,366
Change in value of common stock warrants 4,627,494 (46,609)
Stock-based compensation 793,864 877,511
Interest income accrued on short-term investments (506) (847)
Deferred rent 536,001 (5,651)
Loss on investment in affiliated entity 2,868,135 1,553,917
Transaction costs associated with issuance of warrants 315,970 0
Gain on sale of intangible assets (1,000,000) (651,000)
Changes in operating assets and liabilities:    
Accounts receivable 290,088 35,801
Accounts receivable from affiliated entity 36,234 4,960
Prepaid expenses and other current assets (302,561) 147,567
Prepaid expenses and other current assets from affiliated entity 123,810 (372,749)
Restricted cash (176) (175)
Other assets 650 (14,794)
Accounts payable and accrued expenses 481,257 (694,999)
Accounts payable and accrued expenses due to affiliated entity (141,988) 33,269
Deferred revenue (266,886) (40,445)
Deferred revenue from affiliated entity (162,501) (162,500)
Net cash used in operating activities (10,551,943) (10,751,378)
Cash flows from investing activities:    
Purchases of investments (5,691,902) (6,318,920)
Maturities of investments 450,507 5,725,233
Purchases of capital assets (66,118) (202,921)
Proceeds from sale of intangible assets 1,000,000 150,000
Net cash used in investing activities (4,307,513) (646,608)
Cash flows from financing activities:    
Proceeds from issuance of common stock and warrants, net of issuance costs 19,556,383 0
Proceeds from stock option exercises 10,897 0
Net cash provided by financing activities 19,567,280 0
Effect of exchange rate changes on cash and cash equivalents (1,675) 13
Increase (Decrease) in cash and cash equivalents 4,706,149 (11,397,973)
Cash and cash equivalents, beginning of period 5,646,021 17,350,116
Cash and cash equivalents, end of period $ 10,352,170 $ 5,952,143