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Stockholders' Equity - Valuation Assumptions (Detail)
1 Months Ended 12 Months Ended
Sep. 24, 2008
Jun. 27, 2008
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Dividend yield 0.00% 0.00%         
Expected volatility 80.00% 80.00% 85.00% 85.00% 82.00%
Average risk-free interest rate 2.26% 3.14% 0.80% 0.97% 1.82%
Expected life (in years) 3 years 3 years 4 years 6 months 4 years 5 months 23 days 4 years 6 months