Annual report pursuant to Section 13 and 15(d)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity (Parenthetical)

v3.21.2
Consolidated Statement of Changes in Stockholders' (Deficit) Equity (Parenthetical) - $ / shares
May 31, 2021
Apr. 02, 2021
Dec. 08, 2020
Dec. 04, 2020
Nov. 30, 2020
Nov. 17, 2020
Mar. 04, 2020
Dec. 30, 2019
Dec. 23, 2019
Dec. 13, 2019
Dec. 09, 2019
Jul. 31, 2019
May 31, 2019
Stock price, in dollars per share $ 1.50                       $ 0.50
Registered Direct Offering [Member]                          
Stock price, in dollars per share                 $ 0.305 $ 0.30 $ 0.30    
Private Warrant Exchange [Member]                          
Stock price, in dollars per share   $ 0.90 $ 0.24 $ 0.36 $ 0.60   $ 0.45 $ 0.50       $ 0.40  
Private Placement [Member]                          
Stock price, in dollars per share           $ 1.50             $ 0.50