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, 2014	$ 14,924	$ 29	$ 290,864	$ (277,013)	$ 1,044
Balance, shares at Jun. 30, 2014		29,298,558
Net income (loss)	6,347			6,347
Other comprehensive loss	(99)				(99)
Exercise of stock options	235	$ 0	235	0	0
Exercise of stock options, shares		113,807
Stock-based compensation	1,961		1,961
Balance at Jun. 30, 2015	23,368	$ 29	293,060	(270,666)	945
Balance, shares at Jun. 30, 2015		29,412,365
Net income (loss)	(21,547)			(21,547)
Other comprehensive loss	(93)				(93)
Issuance of stock, net of issue costs	16,500	$ 5	16,495
Issuance of stock, shares		4,440,000
Exercise of stock options	490		490
Exercise of stock options, shares		320,554
Stock-based compensation	2,163		2,163
Balance at Jun. 30, 2016	$ 20,881	$ 34	312,208	(292,213)	852
Balance, shares at Jun. 30, 2016	34,172,919	34,172,919
Net income (loss)	$ (18,485)			(18,485)
Other comprehensive loss	(19)				(19)
Issuance of stock, net of issue costs	8,404	$ 5	8,399
Issuance of stock, shares		5,100,000
Exercise of stock options	99		99	0
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	39,356,999
Cumulative effect of change in accounting principle (Note 2)			$ 122	$ (122)