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Stockholders' Equity (Warrants to Purchase Common Shares) (Detail) (Warrants, USD $) | 12 Months Ended
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Jun. 30, 2012 | Jun. 30, 2011
US$ Warrants |  |
Schedule Of Outstanding Options And Warrants [Line Items] |  |
Number of Warrants, Balance at beginning of year | 7,614,748 | 7,062,248
Number of Warrants, Issued |  | 552,500
Number of Warrants, Expired | (5,550,038) |
Number of Warrants, Balance and exercisable at end of year | 2,064,710 | 7,614,748
Weighted Average Exercise Price, Balance at beginning of year | $ 7.35 | $ 7.53
Weighted Average Exercise Price, Issued |  | $ 5.00
Weighted Average Exercise Price, Expired | $ 7.79 |
Weighted Average Exercise Price, Balance and exercisable at end of year | $ 6.17 | $ 7.35
A$ warrants |  |
Schedule Of Outstanding Options And Warrants [Line Items] |  |
Number of Warrants, Balance at beginning of year | 205,479 | 3,935,433
Number of Warrants, Expired |  | (3,729,954)
Number of Warrants, Balance and exercisable at end of year | 205,479 | 205,479
Weighted Average Exercise Price, Balance at beginning of year | $ 7.68 | $ 9.54
Weighted Average Exercise Price, Expired |  | $ 9.65
Weighted Average Exercise Price, Balance and exercisable at end of year | $ 7.68 | $ 7.68

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