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Condensed Consolidated Statements of Cash Flows (USD $)
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:    
Consolidated net loss $ (19,533,679) $ (10,258,163)
Adjustments to reconcile consolidated net loss to net cash used in operating activities:    
Gain on settlement of notes payable (95,427) 0
Noncash stock compensation expense 11,970,284 3,259,245
Noncash stock expense associated with in-licensing agreement 1,211,250 0
Depreciation 1,558 309
Amortization of premium on investment securities 66,943 0
Change in fair value of notes payable 94,685 (114,282)
Changes in assets and liabilities:    
(Increase) decrease in other current assets (2,383,969) 1,267,843
Increase in accrued interest receivable (47,513) 0
Increase in other assets (13,244) (90,058)
(Decrease) increase in accounts payable and accrued expenses (3,002,113) 1,217,871
(Decrease) increase in interest payable (94,590) 32,318
Decrease in deferred revenue (76,191) (76,190)
Net cash used in operating activities (11,902,006) (4,761,107)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of equipment (3,165) (1,672)
Investment in held-to-maturity long-term securities (6,127,539)  
Investment in held-to-maturity short-term securities (3,090,469) 0
Net cash used in investing activities (9,221,173) (1,672)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from the exercise of warrants 1,602,060 1,723,736
Payment of notes payable (677,778) 0
Proceeds from sale of common stock, net 16,791,408 0
Net cash provided by financing activities 17,715,690 1,723,736
NET DECREASE IN CASH AND CASH EQUIVALENTS (3,407,489) (3,039,043)
Cash and cash equivalents at beginning of period 40,485,466 16,455,995
CASH AND CASH EQUIVALENTS AT END OF PERIOD $ 37,077,977 $ 13,416,952