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Segment and Geographic Area Information - Summary of Company's Revenues and Long-Lived Assets, Net, by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended										6 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2018	Dec. 31, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, net	$ 288		$ 253				$ 313				$ 288		$ 253	$ 313
Revenues	2,442	$ 486	715	$ 928	$ 933	$ 385	701	$ 590	$ 5,971	$ 277	2,928	$ 1,318	2,961	7,539	$ 1,620
Country US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, net	288		253				313				288		253	313
Revenues											2,828		2,861	7,439	1,520
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets, net	$ 0		$ 0				$ 0				0		0	0
Revenues											$ 100		$ 100	$ 100	$ 100

X

- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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