REVENUE - Additional Information (Detail) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Aug. 31, 2016	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Dec. 31, 2014
Revenues [Line Items]
Long-term trade receivables		$ 6,000,000.0		$ 6,000,000.0		$ 100,000
Long-term trade credit maintenance services term				1 year
Contract asset		3,200,000		$ 3,200,000		6,600,000
Allowance for credit losses		0		0		$ 0
Deferred revenue, recognized		2,700,000	$ 2,100,000	6,900,000	$ 5,400,000
Company recognized revenue from performance obligations satisfied in a prior period		$ 0		$ 0
Minimum
Revenues [Line Items]
Expected long-term trade receivables collection period				2 years
Maximum
Revenues [Line Items]
Expected long-term trade receivables collection period				3 years
Itochu Corporation Agreement | Distribution Rights
Revenues [Line Items]
Distribution revenue reclassified as deferred revenue							$ 4,000,000.0
Remaining term of distribution agreement	8 years 6 months