Business Segment, Geographic, and Concentration Risk Information - Summary of Revenue by Geographical Segment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Total revenue:
Total consolidated revenue	$ 46,935	$ 25,307
China
Total revenue:
Total consolidated revenue	28,513	386
United States
Total revenue:
Total consolidated revenue	17,522	20,335
India
Total revenue:
Total consolidated revenue		777
Austria
Total revenue:
Total consolidated revenue		2,173
United Kingdom
Total revenue:
Total consolidated revenue		1,023
Other Foreign Countries
Total revenue:
Total consolidated revenue	$ 900	$ 613