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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from operating activities:    
Net loss $ (8,858,280) $ (8,264,719)
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 39,841 36,816
Amortization of intangible assets 447,927 460,616
Change in value of common stock warrants 1,427,616 3,548,173
Stock-based compensation 519,218 602,904
Interest income accrued on short-term investments (506) 386
Deferred rent (6,727) (215)
Loss on investment in affiliated entity 836,084 561,544
Transaction costs associated with issuance of warrants 315,970 0
Gain on sale of intangible assets 0 (651,000)
Changes in operating assets and liabilities:    
Accounts receivable (198,725) (408,821)
Accounts receivable from affiliated entity (7,303) (660)
Prepaid expenses and other current assets 188,284 (14,684)
Prepaid expenses and other current assets from affiliated entity 54,673 40,296
Restricted cash (87) (87)
Other assets 650 16,349
Accounts payable and accrued expenses 180,041 (1,287,758)
Accounts payable and accrued expenses due to affiliated entity 190,457 61,814
Deferred revenue (153,088) (32,167)
Deferred revenue from affiliated entity (106,250) (106,250)
Net cash used in operating activities (5,130,205) (5,437,463)
Cash flows from investing activities:    
Purchases of investments (400,000) (3,108,920)
Maturities of investments 450,507 2,271,000
Purchases of capital assets (39,709) (96,333)
Proceeds from sale of intangible assets 0 150,000
Net cash provided by (used in) investing activities 10,798 (784,253)
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 4,991 0
Net cash provided by financing activities 19,561,374 0
Effect of exchange rate changes on cash and cash equivalents (1,189) 495
Increase (Decrease) in cash and cash equivalents 14,440,778 (6,221,221)
Cash and cash equivalents, beginning of period 5,646,021 17,350,116
Cash and cash equivalents, end of period $ 20,086,799 $ 11,128,895