REVENUE - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2014
Disaggregation Of Revenue [Line Items]
Long-term trade credit maintenance services term (in years)			1 year
Long-term trade receivables	$ 6,000,000		$ 6,000,000		$ 100,000
Contract asset	8,000,000		8,000,000		6,600,000
Allowance for credit losses	0		0		$ 0
Deferred revenue, recognized	1,600,000	$ 2,000,000	8,500,000	$ 7,400,000
Company recognized revenue from performance obligations satisfied in a prior period	$ 0		$ 0
Minimum
Disaggregation Of Revenue [Line Items]
Expected long-term trade receivables collection period (in years)			2 years
Maximum
Disaggregation Of Revenue [Line Items]
Expected long-term trade receivables collection period (in years)			3 years
Itochu Corporation Agreement | Distribution rights
Disaggregation Of Revenue [Line Items]
Remaining performance obligation						$ 4,000,000
Itochu Corporation Agreement | Distribution rights | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01
Disaggregation Of Revenue [Line Items]
Performance obligation period						8 years 6 months