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Stockholders' Equity - Summary of Reconciliation of Warrants to Purchase Share of the Company's Common Stock (Detail) - $ / shares
 6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Common Stock Warrants [Abstract]      
Number of Warrants, Outstanding and exercisable, Beginning balance 486,812 623,605 623,605
Number of Warrants, Issued 0 486,812 0
Number of Warrants, Expired 0 (623,605) 0
Number of Warrants, Outstanding and exercisable, Ending balance 486,812 486,812 623,605
Weighted Average Exercise Price, Outstanding and exercisable, Beginning balance $ 1.23 $ 2.50 $ 2.50
Weighted Average Exercise Price, Issued 0 1.23 0
Weighted Average Exercise Price, Expired 0 2.50 0
Weighted Average Exercise Price, Outstanding and exercisable, Ending balance $ 1.23 $ 1.23 $ 2.50