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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue:        
Revenue from licensing agreements $ 32,762 $ 37,030 $ 85,237 $ 88,158
Operating expenses:        
Research and development   7,719,720 8,902,802 21,250,896
General and administrative 1,909,937 2,305,241 7,953,989 7,058,166
Wind-down expense 2,694   3,806,142  
Total operating expenses 1,912,631 10,024,961 20,662,933 28,309,062
Loss from operations (1,879,869) (9,987,931) (20,577,696) (28,220,904)
Other income (expense):        
Change in fair value of warrant liability (4,250,308) 427,589 1,596,554 1,068,626
Conversion of CIRM loan to a grant     8,916,641  
Gain on extinguishment of loan payable     242,931  
Discount received on settlement of vendor invoices 1,875,701   1,875,701  
Write-down of fixed assets     (3,332,736)  
Gain on disposal of fixed assets 18,888   18,888 168,898
Interest income 218 2,171 8,530 5,704
Interest expense (12,500) (106,843) (40,529) (438,466)
Other income (expense), net   22,367 (2,101) 129,978
Total other income (expense), net (2,368,001) 345,284 9,283,879 765,842
Net loss $ (4,247,870) $ (9,642,647) $ (11,293,817) $ (27,455,062)
Basic and diluted net income (loss) per share [1] $ (0.30) $ (1.07) $ (0.95) $ (3.62)
Weighted average number of common shares outstanding, basic and diluted [1] 13,972,198 9,039,863 11,829,390 7,592,238
[1] Adjusted for the 1-for-12 reverse stock split as discussed in Note 1.