Other Financial Statements Details - Intangible Assets (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Amount	$ 22,003	$ 22,003
Accumulated Amortization	(5,478)	(3,534)
Net Amount	16,525	18,469
Patents and Merger Costs [Member]
Finite Lived Intangible Assets [Line Items]
Amount	22,003	22,003
Accumulated Amortization	(5,478)	(3,534)
Net Amount	$ 16,525	$ 18,469