Stockholders' Equity - Warrants to Purchase Common Shares (Detail) (Warrants, US$ Warrants, USD $)	6 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Warrants | US$ Warrants
Schedule Of Outstanding Options And Warrants [Line Items]
Number of Warrants, Balance at beginning of year	2,064,710	7,614,748
Number of Warrants, Issued	623,605
Number of Warrants, Expired	(1,512,210)	(2,814,701)
Number of Warrants, Balance at end of period	1,176,105	4,800,047
Number of Warrants, Exercisable at end of period	552,500	4,800,047
Weighted Average Exercise Price, Balance at beginning of year	$ 6.17	$ 7.35
Weighted Average Exercise Price, Issued	$ 2.50
Weighted Average Exercise Price, Expired	$ 6.60	$ 8.76
Weighted Average Exercise Price, Balance at end of period	$ 3.67	$ 6.53
Weighted Average Exercise Price, Exercisable at end of period	$ 5.00	$ 6.53