CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Total
Balance at Jun. 30, 2012	$ 778	$ 587,068	$ (503,956)	$ 83,890
Balance (in shares) at Jun. 30, 2012	77,759
Increase (Decrease) in Shareholders' Equity
Net (loss) income			(72,811)	(72,811)
Stock options exercised	$ 6	4,020		4,026
Stock options exercised (in shares)	666
Restricted stock award (in shares)	50
Stock-based compensation expense		12,400		12,400
Issuance of common stock in a public offering, net of issuance costs	$ 63	93,928		93,991
Issuance of common stock in a public offering, net of issuance costs (in shares)	6,250
Directors' deferred share unit compensation		351		351
Balance at Jun. 30, 2013	$ 847	697,767	(576,767)	121,847
Balance (in shares) at Jun. 30, 2013	84,725
Increase (Decrease) in Shareholders' Equity
Net (loss) income			(71,364)	(71,364)
Stock options exercised	$ 11	9,125		9,136
Stock options exercised (in shares)	1,134
Stock-based compensation expense		15,647		15,647
Directors' deferred share units converted	$ 1	(1)
Directors' deferred share units converted (in shares)	44
Directors' deferred share unit compensation		433		433
Balance at Jun. 30, 2014	$ 859	722,971	(648,131)	$ 75,699
Balance (in shares) at Jun. 30, 2014	85,903			85,903
Increase (Decrease) in Shareholders' Equity
Net (loss) income			(60,739)	$ (60,739)
Stock options exercised	$ 7	4,422		4,429
Stock options exercised (in shares)	651
Restricted stock award (in shares)	25
Stock-based 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			86,579