CONSOLIDATED STATEMENTS OF SHAREHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Jun. 30, 2014	$ 859	$ 722,971	$ (648,131)	$ 75,699
Balance (in shares) at Jun. 30, 2014	85,903
Increase (Decrease) in Shareholders' (Deficit) Equity
Net loss			(60,739)	(60,739)
Stock options exercised	$ 7	4,422		4,429
Stock options exercised (in shares)	651
Restricted stock award - net of forfeitures (in shares)	25
Stock option and restricted stock compensation expense		15,326		15,326
Directors' deferred share unit compensation		389		389
Balance at Jun. 30, 2015	$ 866	743,108	(708,870)	35,104
Balance (in shares) at Jun. 30, 2015	86,579
Increase (Decrease) in Shareholders' (Deficit) Equity
Net loss			(144,817)	(144,817)
Stock options exercised	$ 5	5,156		5,161
Stock options exercised (in shares)	555
Restricted stock award - net of forfeitures	$ 1	(1)
Restricted stock award - net of forfeitures (in shares)	75
Stock option and restricted stock compensation expense		21,868		21,868
Directors' deferred share unit compensation		380		380
Balance at Jun. 30, 2016	$ 872	770,511	(853,687)	(82,304)
Balance (in shares) at Jun. 30, 2016	87,209
Increase (Decrease) in Shareholders' (Deficit) Equity
Net loss			(78,883)	(78,883)
Restricted stock award - net of forfeitures	$ 1			1
Restricted stock award - net of forfeitures (in shares)	92
Stock option and restricted stock compensation expense		8,121		8,121
Directors' deferred share unit compensation		215		215
Balance at Dec. 31, 2016	$ 873	778,847	(932,570)	$ (152,850)
Balance (in shares) at Dec. 31, 2016	87,301			87,301
Increase (Decrease) in Shareholders' (Deficit) Equity
Net loss			(96,012)	$ (96,012)
Stock options exercised	$ 1	649		650
Stock options exercised (in shares)	191
Restricted stock award - net of forfeitures	$ 21	(21)
Restricted stock award - net of forfeitures (in shares)	2,146
Stock option and restricted stock compensation expense		11,119		11,119
Directors' deferred share units converted	$ 1	(1)		206
Directors' deferred share units converted (in shares)	53
Issuance of common stock	$ 167	101,496		101,663
Issuance of common stock (in shares)	16,675
Conversion of debt	$ 262	117,067		117,329
Conversion of debt (in shares)	26,160
Directors' deferred share unit compensation		206
Balance at Dec. 31, 2017	$ 1,325	$ 1,009,362	$ (1,028,582)	$ (17,895)
Balance (in shares) at Dec. 31, 2017	132,526			132,526