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Consolidated Statements of Cash Flows (Unaudited) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from operating activities:      
Net loss $ (66,083,532) $ (19,712,980) $ (15,304,095)
Adjustments to reconcile net loss to net cash used in operating activities:      
Depreciation 328,752 173,750 142,197
Amortization of intangible assets 1,770,537 1,821,170 1,869,517
Change in value of common stock warrants 45,632,669 (1,982,620) (8,690,658)
Stock-based compensation 1,868,345 1,345,613 1,654,823
Interest income accrued on short-term investments (484) (1,147) 6,271
Deferred taxes 32,274 22,806 25,673
Deferred rent 410,187 (15,799) 13,763
Transaction costs associated with issuance of warrants 315,970 0 0
Loss on short-term investments 38,950 0 0
Loss on disposal of fixed assets 1,822 0 0
Loss (Gain) on investment in affiliated entity 1,038,745 (1,631,819) 2,390,498
Gain on sale of intangible assets (2,000,000) (1,151,000) (587,000)
Changes in operating assets and liabilities:      
Accounts receivable (2,471,130) (362,524) (435,022)
Accounts receivable from affiliated entity 36,234 2,172 33,743
Prepaid expenses and other current assets (229,705) 363,584 (472,074)
Prepaid expenses and other current assets from affiliated entity (1,401,258) (445,981) 212,250
Restricted cash (352) (351) (100,059)
Other assets 26,793 (14,794) 50,866
Accounts payable and accrued expenses 2,164,045 (790,844) 1,789,376
Accounts payable and accrued expenses due to affiliated entity 334,980 166,931 (1,660,603)
Deferred revenue 3,179,721 282,048 (333,725)
Deferred revenue from affiliated entity (375,000) (375,000) (361,458)
Net cash used in operating activities (15,381,437) (22,306,785) (19,755,717)
Cash flows from investing activities:      
Purchases of investments (15,399,495) (9,142,220) (18,193,614)
Maturities of investments 4,339,577 14,008,771 7,206,000
Purchases of capital assets (176,925) (240,986) (161,187)
Additional investment in affiliated entity 0 0 (101,123)
Proceeds from sale of intangible assets 2,000,000 650,000 350,000
Net cash (used in) provided by investing activities (9,236,843) 5,275,565 (10,899,924)
Cash flows from financing activities:      
Proceeds from issuance of common stock and warrants, net of issuance costs 32,883,705 5,325,141 27,994,601
Proceeds from stock option and warrant exercises 19,808,232 0 15,930
Net cash provided by financing activities 52,691,937 5,325,141 28,010,531
Effect of exchange rate changes on cash and cash equivalents 118 1,984 (3,263)
Increase (Decrease) in cash and cash equivalents 28,073,775 (11,704,095) (2,648,373)
Cash and cash equivalents, beginning of period 5,646,021 17,350,116 19,998,489
Cash and cash equivalents, end of period 33,719,796 5,646,021 17,350,116
Supplemental disclosure of non-cash activities      
Lease incentive $ 2,538,000 $ 0 $ 0