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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, 2015 $ 23,368 $ 29 $ 293,060 $ (270,666) $ 945
Balance, shares at Jun. 30, 2015   29,412,365      
Net loss (21,547) $ 0 0 (21,547) 0
Other comprehensive income (loss) (93) 0 0 0 (93)
Issuance of stock, net of issue costs 16,500 $ 5 16,495 0 0
Issuance of stock, net of issue costs, shares   4,440,000      
Exercise of stock options 490 $ 0 490 0 0
Exercise of stock options, shares   320,554      
Stock-based compensation 2,163 $ 0 2,163 0 0
Balance at Jun. 30, 2016 20,881 $ 34 312,208 (292,213) 852
Balance, shares at Jun. 30, 2016   34,172,919      
Net loss (18,485) $ 0 0 (18,485) 0
Other comprehensive income (loss) (19) 0 0 0 (19)
Issuance of stock, net of issue costs 8,404 $ 5 8,399 0 0
Issuance of stock, net of issue costs, shares   5,100,000      
Exercise of stock options 99 $ 0 99 0 0
Exercise of stock options, shares   84,080      
Stock-based compensation 2,456 $ 0 2,456 0 0
Balance at Jun. 30, 2017 $ 13,336 $ 39 323,284 (310,820) 833
Balance, shares at Jun. 30, 2017 39,356,999 39,356,999      
Cumulative effect adjustment for adoption of new accounting principle (Note 2) $ 0 $ 0 122 (122) 0
Net loss (53,171) 0 0 (53,171) 0
Other comprehensive income (loss) 5 0 0 0 5
Issuance of stock, net of issue costs 47,982 $ 35 47,947 0 0
Issuance of stock, net of issue costs, shares   34,690,548      
Fair value of warrants issued 355 $ 0 355 0 0
Exercise of stock options 503 $ 0 503 0 0
Exercise of stock options, shares   310,900      
Vesting of stock units (27) $ 0 (27) 0 0
Vesting of stock units, shares   153,601      
Stock-based compensation 2,704 $ 0 2,704 0 0
Balance at Jun. 30, 2018 $ 11,687 $ 74 374,766 (363,991) 838
Balance, shares at Jun. 30, 2018 74,512,048 74,512,048      
Net loss $ (44,720) $ 0 0 (44,720) 0
Other comprehensive income (loss) 1 0 0 0 1
Exercise of warrants 28,863 $ 21 28,842 0 0
Exercise of warrants, shares   20,184,224      
Exercise of stock options 536 $ 0 536 0 0
Exercise of stock options, shares   362,291      
Vesting of stock units (168) $ 0 (168) 0 0
Vesting of stock units, shares   313,673      
Settlement of derivative liability 38,666 $ 0 38,666 0 0
Settlement of derivative liability, shares   0      
Stock-based compensation 2,550 $ 0 2,550 0 0
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      
Cumulative effect adjustment for adoption of new accounting principle (Note 2) $ 218 $ 0 $ 0 $ 218 $ 0