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Fair Value Measurements - Assets and Liabilities Carried at Fair Value Measured on Recurring Basis (Detail) - USD ($)
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents $ 43,194,000 $ 28,826,000 $ 13,521,000
Total cash equivalents 43,194,000 28,826,000 13,521,000
Liabilities:      
Derivative liabilities   19,780,000  
Total derivative liabilities   19,780,000  
Quoted Prices in Active Markets (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents 43,194,000 28,826,000 13,521,000
Total cash equivalents 43,194,000 28,826,000 13,521,000
Liabilities:      
Derivative liabilities   0  
Total derivative liabilities   0  
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents 0 0 0
Total cash equivalents 0 0 0
Liabilities:      
Derivative liabilities   0  
Total derivative liabilities   0  
Significant Unobservable Inputs (Level 3) [Member]      
Liabilities:      
Derivative liabilities 0 19,780,000 0
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash equivalents 0 0 0
Total cash equivalents $ 0 0 $ 0
Liabilities:      
Derivative liabilities   19,780,000  
Total derivative liabilities   $ 19,780,000