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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-In Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Balance at Jun. 30, 2016 $ 20,881 $ 34 $ 312,208 $ (292,213) $ 852
Balance, shares at Jun. 30, 2016   34,172,919      
Cumulative effect adjustment for adoption of new accounting principle     122 (122)  
Net loss (18,485)     (18,485)  
Other comprehensive income (loss) (19)       (19)
Issuance of stock, net of issue costs 8,404 $ 5 8,399    
Issuance of stock, net of issue costs, shares   5,100,000      
Exercise of stock options 99   99    
Exercise of stock options, shares   84,080      
Stock-based compensation 2,456   2,456    
Balance at Jun. 30, 2017 13,336 $ 39 323,284 (310,820) 833
Balance, shares at Jun. 30, 2017   39,356,999      
Net loss (53,171)     (53,171)  
Other comprehensive income (loss) 5       5
Issuance of stock, net of issue costs 47,982 $ 35 47,947    
Issuance of stock, net of issue costs, shares   34,690,548      
Fair value of warrants issued 355   355    
Exercise of stock options 503   503    
Exercise of stock options, shares   310,900      
Vesting of stock units (27)   (27)    
Vesting of stock units, shares   153,601      
Stock-based compensation 2,704   2,704    
Balance at Jun. 30, 2018 11,687 $ 74 374,766 (363,991) 838
Balance, shares at Jun. 30, 2018   74,512,048      
Cumulative effect adjustment for adoption of new accounting principle 218     218  
Net loss (44,720)     (44,720)  
Other comprehensive income (loss) 1       1
Exercise of warrants 28,863 $ 21 28,842    
Exercise of warrants , shares   20,184,224      
Exercise of stock options 536   536    
Exercise of stock options, shares   362,291      
Vesting of stock units (168)   (168)    
Vesting of stock units, shares   313,673      
Settlement of derivative liability 38,666   38,666    
Stock-based compensation 2,550   2,550    
Balance at Dec. 31, 2018 $ 37,633 $ 95 445,192 (408,493) 839
Balance, shares at Dec. 31, 2018 95,372,236 95,372,236      
Net loss $ (56,793)     (56,793)  
Other comprehensive income (loss) 1       1
Issuance of stock, net of issue costs 22,627 $ 13 22,614    
Issuance of stock, net of issue costs, shares   13,525,377      
Exercise of stock options 414 $ 1 413    
Exercise of stock options, shares   223,426      
Vesting of stock units (120)   (120)    
Vesting of stock units, shares   296,283      
Stock-based compensation 4,568   4,568    
Balance at Dec. 31, 2019 $ 8,330 $ 109 $ 472,667 $ (465,286) $ 840
Balance, shares at Dec. 31, 2019 109,417,322 109,417,322