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Fair Value Measurements, Marketable Securities and Variable Interest Entities - Schedule of Company's Recurring Financial Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Jun. 30, 2016
Money market funds [Member]    
Assets:    
Assets, Fair Value Measurements $ 10,300 $ 20,200
Fair Value Measurements, Recurring [Member] | Revolving loan facility [Member]    
Liabilities:    
Liabilities, Fair Value Measurements   15,000
Fair Value Measurements, Recurring [Member] | Money market funds [Member]    
Assets:    
Assets, Fair Value Measurements 10,330 20,203
Fair Value Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member]    
Assets:    
Assets, Fair Value Measurements $ 10,330 20,203
Fair Value Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Revolving loan facility [Member]    
Liabilities:    
Liabilities, Fair Value Measurements   $ 15,000