CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Balance at Jun. 30, 2010	$ 102,048	$ 679	$ 473,450	$ (372,363)	$ 282
Balance (in shares) at Jun. 30, 2010		67,931
Increase (Decrease) in Shareholders' Equity
Unrealized gains on marketable securities	(282)				(282)
Net loss	(58,274)			(58,274)
Stock options exercised	2,719	6	2,713
Stock options exercised (in shares)		550
Stock-based compensation expense	5,452		5,452
Issuance of common stock in a public offering, net of issuance costs	87,980	78	87,902
Issuance of common stock in a public offering, net of issuance costs (in shares)		7,800
Directors' deferred share unit compensation	326		326
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	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