REVENUE RECOGNITION AND RELATED ALLOWANCES - Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) customer	Mar. 31, 2020 USD ($) customer
Revenue recognition	$ 54,521	$ 49,774
Tripartite Agreement-Yescart
Revenue recognition	11,200
Payment for legal expenditures	400
Sales of contract manufactured products [Member]
Revenue, Remaining Performance Obligation, Amount	$ 6,300
Revenue, Remaining Performance Obligation, Remaining Period	12 months
Revenue recognition	$ 2,573	$ 1,974
Product Development Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 800
Revenue, Remaining Performance Obligation, Remaining Period	18 months
Customer concentration \| Revenue
Number of major customers \| customer	3	3
Customer concentration \| Revenue \| Tripartite Agreement-Yescart
Concentration Risk, Percentage	21.00%
Customer concentration \| Revenue \| Customer One [Member]
Concentration Risk, Percentage	28.00%	31.00%
Customer concentration \| Revenue \| Customer Two [Member]
Concentration Risk, Percentage	24.00%	23.00%
Customer concentration \| Revenue \| Customer Three [Member]
Concentration Risk, Percentage	16.00%	18.00%
Customer concentration \| Accounts receivable
Concentration Risk, Percentage	73.00%

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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The amount of cash paid for the settlement of litigation or for other legal issues during the period.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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