Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details)

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Quarterly Financial Data (Unaudited) - Summary of Quarterly Financial Data (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 31, 2017
Apr. 30, 2017
Jan. 31, 2017
Oct. 31, 2016
Jul. 31, 2016
Apr. 30, 2016
Jan. 31, 2016
Oct. 31, 2015
Jul. 31, 2017
Jul. 31, 2016
Quarterly Financial Information Disclosure [Abstract]                    
Revenue    
Research and development 3,314,325 2,656,073 2,882,611 3,099,739 3,592,042 3,376,757 4,113,582 3,659,313    
General and administrative 2,583,605 1,904,899 2,504,700 2,502,455 2,969,952 2,874,362 2,924,138 3,375,906    
Loss from operations (5,897,930) (4,560,972) (5,387,311) (5,602,194) (6,561,994) (6,251,119) (7,037,720) (7,035,219)    
Provision for income taxes 1,391 290 2,172 $ 1,391 $ 2,462
Net loss $ (5,897,930) $ (4,560,972) $ (5,387,311) $ (5,603,585) $ (6,561,994) [1] $ (6,251,409) [1] $ (7,037,720) [1] $ (7,037,391) [1] $ (21,449,798) $ (26,888,514)
Basic and diluted net loss per share $ (0.28) $ (0.22) $ (0.27) $ (0.29) $ (0.39) [2] $ (0.37) [2] $ (0.42) [2] $ (0.47) [2] $ (1.06) $ (1.63)
[1] The format has been recast to conform to the accompanying consolidated statements of operations.
[2] Loss per share is computed independently for each of the quarters presented.Therefore, the sum of the quarterly net loss per share will not necessarily equal the total for the year.