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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 28, 2018
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Finite-Lived Intangible Assets [Line Items]          
Amortization expense   $ 1,229 $ 981 $ 724 $ 756
DEXYCU [Member] | Icon Bioscience Inc [Member]          
Finite-Lived Intangible Assets [Line Items]          
Initial purchase price $ 32,000        
Annual amortization expense $ 2,500