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Consolidated Statements of Operations - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Dec. 31, 2013
Operating expenses:      
Research and development $ (839,959) $ (7,872,397) $ (5,248,669)
General and administrative (12,106,859) (9,226,883) (1,525,257)
Total operating expenses (12,946,818) (17,099,280) (6,773,926)
Loss from operations (12,946,818) (17,099,280) (6,773,926)
Other (expenses) income:      
Loss on change in fair value of derivative liabilities (7,954,970) (3,710,277) $ (12,877,675)
Interest income 1,411 10,883  
Interest expense (435,611) (4,922) $ (220,307)
Total other expenses (8,389,170) (3,704,316) (13,097,982)
Net loss $ (21,335,988) $ (20,803,596) $ (19,871,908)
Net loss per common share - basic and diluted $ (8.65) $ (2.09) $ (40.90)
Weighted average number of common shares outstanding - basic and diluted 2,466,466 9,941,156 485,853