Consolidated Statements of Stockholders' Equity - USD ($)
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Total
Balance at Jul. 31, 2015 $ 420,000 $ 90,811,000 $ (88,848,000) $ 2,383,000
Balance, shares at Jul. 31, 2015 41,859,297      
Issuance of common stock in private placements, net $ 177,000 (177,000)
Issuance of common stock in private placements, net, shares 17,777,772      
Share-based compensation expense - stock options 358,000 358,000
Share-based compensation expense - restricted stock units 1,544,000 1,544,000
Stock issued for services $ 3,000 287,000 290,000
Stock issued for services, shares 250,000      
Warrant liability removed due to warrant exercise and cancellation   13,550,000 13,550,000
Issuance of common stock upon vesting of restricted stock units $ 21,000 (21,000)
Issuance of common stock upon vesting of restricted stock units, shares 2,075,000      
Issuance of common stock upon exercise of warrants $ 28,000 1,241,000 1,269,000
Issuance of common stock upon exercise of warrants, shares 2,861,848      
Net loss (14,371,000) (14,371,000)
Balance at Jul. 31, 2016 $ 649,000 107,593,000 (103,219,000) 5,023,000
Balance, shares at Jul. 31, 2016 64,823,917      
Issuance of common stock in private placements, net $ 16,000 1,033,000 1,049,000
Issuance of common stock in private placements, net, shares 1,572,941      
Share-based compensation expense - stock options 968,000 968,000
Share-based compensation expense - restricted stock units 102,000 102,000
Warrant liability removed due to warrant exercise and cancellation 226,000 226,000
Issuance of common stock upon vesting of restricted stock units $ 1,000 (1,000)
Issuance of common stock upon vesting of restricted stock units, shares 150,000      
Issuance of common stock upon exercise of warrants $ 3,000 182,000 185,000
Issuance of common stock upon exercise of warrants, shares 346,295      
Net loss (6,263,000) (6,263,000)
Restricted stock unit cancellation $ (38,000) 38,000
Restricted stock unit cancellation, shares (3,800,000)      
Balance at Jul. 31, 2017 $ 631,000 $ 110,141,000 $ (109,482,000) $ 1,290,000
Balance, shares at Jul. 31, 2017 63,093,153