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Significant Accounting Policies - Potentially Dilutive Securities Excluded from Computation of Diluted Weighted-Average Shares (Detail) - shares
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Anti-dilutive common stock equivalents outstanding excluded from diluted earnings per share calculation 8,677,790 5,605,026 2,563,293
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 6,895,685 4,981,421 2,010,793
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 623,605 623,605 552,500
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 948,500 0 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 210,000 0 0