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Fair Value Measurements (Assets and Liabilities Carried at Fair Value Measured on Recurring Basis) (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Jun. 30, 2011
Assets:    
Cash equivalents $ 4,292 $ 8,678
Marketable securities:    
Marketable securities 14,238 19,894
Liabilities:    
Derivative liabilities   170
Corporate bonds
    
Marketable securities:    
Marketable securities 5,950 7,312
Commercial paper
    
Marketable securities:    
Marketable securities 3,046 2,699
Certificates of deposit
    
Marketable securities:    
Marketable securities 950  
U.S. Government obligations
    
Marketable securities:    
Marketable securities   1,205
Quoted prices in active markets (Level 1)
    
Assets:    
Cash equivalents 4,042 8,678
Marketable securities:    
Marketable securities 7,726 14,470
Quoted prices in active markets (Level 1) | Corporate bonds
    
Marketable securities:    
Marketable securities 3,684 5,792
Significant other observable inputs (Level 2)
    
Assets:    
Cash equivalents 250  
Marketable securities:    
Marketable securities 6,512 5,424
Significant other observable inputs (Level 2) | Corporate bonds
    
Marketable securities:    
Marketable securities 2,266 1,520
Significant other observable inputs (Level 2) | Commercial paper
    
Marketable securities:    
Marketable securities 3,046 2,699
Significant other observable inputs (Level 2) | Certificates of deposit
    
Marketable securities:    
Marketable securities 950  
Significant other observable inputs (Level 2) | U.S. Government obligations
    
Marketable securities:    
Marketable securities   1,205
Significant unobservable inputs (Level 3)
    
Liabilities:    
Derivative liabilities   $ 170