Condensed 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
Net loss	(12,369)			(12,369)
Other comprehensive income (loss)	(28)				(28)
Issuance of stock, net of issue costs	2,153	$ 1	2,152
Issuance of stock, shares		1,411,686
Exercise of stock options	99		99
Exercise of stock options, shares		84,080
Stock-based compensation	1,774		1,774
Balance at Mar. 31, 2017	12,510	$ 35	316,233	(304,582)	824
Balance, shares at Mar. 31, 2017		35,668,685
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
Net loss	$ (18,743)			(18,743)
Other comprehensive income (loss)	4				4
Issuance of stock, net of issue costs	11,605	$ 15	11,590
Issuance of stock, shares		14,506,324
Fair value of warrant issued	268		268
Vesting of performance stock units	(2)		(2)
Vesting of performance stock units, shares		46,594
Stock-based compensation	1,730		1,730
Balance at Mar. 31, 2018	$ 8,198	$ 54	$ 336,870	$ (329,563)	$ 837
Balance, shares at Mar. 31, 2018	53,909,917	53,909,917