Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (unaudited) - USD ($)
$ in Thousands
Convertible Preferred Stock
Common stock
Additional paid-in capital
Accumulated deficit
Total
Balance at Feb. 29, 2020   $ 2 $ 64,071 $ (320,868) $ (256,795)
Balance (shares) at Feb. 29, 2020   6,033,450      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Exercise of stock options and common stock warrants     2,999   2,999
Exercise of stock options and common stock warrants (shares) 0 347,807      
Stock-based compensation expense     1,259   1,259
Net loss       (13,960) (13,960)
Balance at May. 31, 2020   $ 2 68,329 (334,828) (266,497)
Balance (shares) at May. 31, 2020   6,381,257      
Balance at Feb. 29, 2020 $ 233,022        
Balance (shares) at Feb. 29, 2020 19,513,939        
Balance at May. 31, 2020 $ 233,022        
Balance (shares) at May. 31, 2020 19,513,939        
Balance at Feb. 29, 2020   $ 2 64,071 (320,868) (256,795)
Balance (shares) at Feb. 29, 2020   6,033,450      
Balance at Feb. 28, 2021   $ 6 762,362 (371,520) 390,848
Balance (shares) at Feb. 28, 2021   55,699,052      
Balance at Feb. 29, 2020 $ 233,022        
Balance (shares) at Feb. 29, 2020 19,513,939        
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of common stock in connection with acquisition     116,187   116,187
Issuance of common stock in connection with acquisition (shares)   2,822,242      
Exercise of stock options and common stock warrants $ 0 $ 0 2,141 0 2,141
Exercise of stock options and common stock warrants (shares) 0 236,982      
Purchase of capped calls     (34,503)   (34,503)
Issuance of common stock in connection with the employee stock purchase plan     1,948   1,948
Common stock issued   50,516      
Issuance of replacement awards in connection with acquisition     1,520   1,520
Stock-based compensation expense     7,675   7,675
Net loss       (48,707) (48,707)
Balance at May. 31, 2021   $ 6 $ 857,330 $ (420,227) $ 437,109
Balance (shares) at May. 31, 2021   58,808,792