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Significant Accounting Policies - Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares (Detail) - shares
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 10,121,820 30,321,078 8,677,790 5,605,026
Options [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 8,139,377 7,750,244 6,895,685 4,981,421
Warrants [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 486,812 20,671,036 623,605 623,605
RSU [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 1,090,213 1,398,129 948,500 0
Performance Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 370,000 466,668 210,000 0
Deferred Stock Units [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 35,418 35,001 0 0