CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)	Comprehensive (Loss)
Balance at Jun. 30, 2009	$ 66,857	$ 569	$ 387,947	$ (321,451)	$ (208)
Balance (in shares) at Jun. 30, 2009		56,947,000
Increase (Decrease) in Shareholders' Equity
Unrealized gains on marketable securities	490				490	490
Net loss	(50,912)			(50,912)		(50,912)
Stock options exercised	3,461	6	3,455
Stock options exercised (in shares)		634,000
Stock-based compensation expense	4,170		4,170
Issuance of common stock in a public offering, net of issuance costs	77,522	104	77,418
Issuance of common stock in a public offering, net of issuance costs (in shares)		10,350,000
Directors' deferred share unit compensation	460		460
Comprehensive loss						(50,422)
Balance at Jun. 30, 2010	102,048	679	473,450	(372,363)	282
Balance (in shares) at Jun. 30, 2010		67,931,000
Increase (Decrease) in Shareholders' Equity
Unrealized gains on marketable securities	(282)				(282)	(282)
Net loss	(58,274)			(58,274)		(58,274)
Stock options exercised	2,719	6	2,713
Stock options exercised (in shares)		550,000
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)		7,800,000
Directors' deferred share unit compensation	326		326
Comprehensive loss						(58,556)
Balance at Jun. 30, 2011	139,969	763	569,843	(430,637)
Balance (in shares) at Jun. 30, 2011	76,281,000	76,281,000
Increase (Decrease) in Shareholders' Equity
Net loss	(73,319)			(73,319)		(73,319)
Stock options exercised	6,988	14	6,974
Stock options exercised (in shares)		1,432,000
Stock-based compensation expense	9,938		9,938
Directors' deferred share units converted		1	(1)
Directors' deferred share units converted (in shares)		46,000
Directors' deferred share unit compensation	314		314
Comprehensive loss						(73,319)
Balance at Jun. 30, 2012	$ 83,890	$ 778	$ 587,068	$ (503,956)
Balance (in shares) at Jun. 30, 2012	77,759,000	77,759,000