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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 8,634	$ 2,509	$ 7,210	$ 2,012	$ 2,442	$ 486	$ 715	$ 928	$ 933	$ 385	$ 2,928	$ 1,318	$ 20,365	$ 4,571	$ 2,961	$ 7,539
Long-lived assets, net	357				288						288		357	288
Country US [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues											1,108		19,144		2,861	7,439
Long-lived assets, net	$ 357				288						288		357	288
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues											1,720		1,121
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues											100		$ 100		$ 100	$ 100
Long-lived assets, net					$ 0						$ 0			$ 0

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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