CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit
Balance at Jun. 30, 2011	$ 139,969	$ 763	$ 569,843	$ (430,637)
Balance (in shares) at Jun. 30, 2011		76,281
Increase (Decrease) in Shareholders' Equity
Net loss	(73,319)			(73,319)
Stock options exercised	6,988	14	6,974
Stock options exercised (in shares)		1,432
Stock-based compensation expense	9,938		9,938
Directors' deferred share units converted		1	(1)
Directors' deferred share units converted (in shares)		46
Directors' deferred share unit compensation	314		314
Balance at Jun. 30, 2012	83,890	778	587,068	(503,956)
Balance (in shares) at Jun. 30, 2012		77,759
Increase (Decrease) in Shareholders' Equity
Net loss	(72,811)			(72,811)
Stock options exercised	4,026	6	4,020
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	93,991	63	93,928
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	121,847	847	697,767	(576,767)
Balance (in shares) at Jun. 30, 2013	84,725	84,725
Increase (Decrease) in Shareholders' Equity
Net loss	(71,364)			(71,364)
Stock options exercised	9,136	11	9,125
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	$ 75,699	$ 859	$ 722,971	$ (648,131)
Balance (in shares) at Jun. 30, 2014	85,903	85,903