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Fair Value Measurements - Assets Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Assets:    
Cash equivalents $ 11,602 $ 15,835
Marketable securities 9,917 9,414
Cash equivalents and marketable securities 21,519 25,249
Corporate Bonds [Member]    
Assets:    
Marketable securities 9,917 9,414
Quoted Prices in Active Markets (Level 1) [Member]    
Assets:    
Cash equivalents 11,602 15,835
Cash equivalents and marketable securities 17,176 23,248
Quoted Prices in Active Markets (Level 1) [Member] | Corporate Bonds [Member]    
Assets:    
Marketable securities 5,574 7,413
Significant Other Observable Inputs (Level 2) [Member]    
Assets:    
Cash equivalents 0 0
Cash equivalents and marketable securities 4,343 2,001
Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds [Member]    
Assets:    
Marketable securities 4,343 2,001
Significant Unobservable Inputs (Level 3) [Member]    
Assets:    
Cash equivalents 0 0
Cash equivalents and marketable securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds [Member]    
Assets:    
Marketable securities $ 0 $ 0