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Intangible Assets - Reconciliation of Intangible Assets (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]        
Gross carrying amount at beginning of period $ 68,322 $ 35,610 $ 36,196  
Acquisition of Icon Bioscience Inc. 0 31,973 0  
Foreign currency translation adjustments 0 739 (586)  
Gross carrying amount at end of period 68,322 68,322 35,610 $ 36,196
Accumulated amortization at beginning of period (36,964) (35,246) (35,094)  
Amortization expense (1,229) (981) (724) (756)
Foreign currency translation adjustments 0 (737) 572  
Accumulated amortization at end of period (38,193) (36,964) (35,246) $ (35,094)
Net book value at end of period $ 30,129 $ 31,358 $ 364