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Share-Based Payment Awards - Summary of Information about Award Grants (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Total cash received from exercise of stock options $ 536 $ 503 $ 99 $ 490
Inducement Award Grants [Member]        
Weighted-average grant date fair value per share $ 1.24 $ 1.14 $ 0.84  
Total cash received from exercise of stock options $ 317 $ 0 $ 0  
Total intrinsic value of stock options exercised $ 44 $ 0 $ 0