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, 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	$ 1	(1)
Restricted stock award (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
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
Conversion of debt	$ 262	117,067		117,329
Conversion of debt (in shares)	26,160
Issuance of common stock	$ 167	101,496		101,663
Issuance of common stock (in shares)	16,675
Stock option and restricted stock compensation expense		11,119		11,119
Directors' deferred share units converted	$ 1	(1)
Directors' deferred share units converted (in shares)	53
Directors' deferred share unit compensation		206		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
Increase (Decrease) in Shareholders' (Deficit) Equity
Net loss			(168,843)	$ (168,843)
Issuance of common stock pursuant to the exercise of stock options and employee stock purchase plan	$ 9	4,292		4,301
Issuance of common stock pursuant to the exercise of stock options and employee stock purchase plan (in shares)	946
Issuance of common stock	$ 158	162,354		162,512
Issuance of common stock (in shares)	15,755
Stock option and restricted stock compensation expense		16,445		16,445
Directors' deferred share units converted	$ 2	(1)		1
Directors' deferred share units converted (in shares)	173
Directors' deferred share unit compensation		361		361
Balance at Dec. 31, 2018	$ 1,494	$ 1,192,813	(1,183,335)	$ 10,972
Balance (in shares) at Dec. 31, 2018	149,400			149,400
Increase (Decrease) in Shareholders' (Deficit) Equity
Transition adjustment for ASC 606			$ 14,090	$ 14,090