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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

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Finite lived intangible assets foreign currency translation of accumulated amortization.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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