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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Stock-based compensation
Stock-based compensation	$ 3,969,000	$ 2,485,000	$ 10,167,000	$ 8,154,000
Tax benefit from stock based compensation expense			0	0
Fair value of the assumed awards attributable to future stock-based compensation expense	23,000,000.0		$ 23,000,000.0
Expected period for unrecognized expense			2 years 6 months
Product cost of revenue
Stock-based compensation
Stock-based compensation	57,000	26,000	$ 123,000	62,000
Service cost of revenue
Stock-based compensation
Stock-based compensation	204,000	124,000	493,000	367,000
Research and development
Stock-based compensation
Stock-based compensation	868,000	521,000	2,164,000	1,359,000
Sales and marketing
Stock-based compensation
Stock-based compensation	1,189,000	721,000	2,952,000	2,265,000
General and administrative
Stock-based compensation
Stock-based compensation	$ 1,651,000	$ 1,093,000	$ 4,435,000	$ 4,101,000

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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