Segment Information - Summary of Revenues on Percentage Basis by Geographic Region (Detail)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	100.00%	100.00%	100.00%
United States [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	51.00%	63.00%	78.00%
South America [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	11.00%	10.00%	7.00%
Japan [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	7.00%	5.00%	2.00%
Europe [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	19.00%	15.00%	9.00%
Other [Member]
Segment Reporting Information [Line Items]
Revenues on a percentage basis by geographic region, based on the country	12.00%	7.00%	4.00%