Number of major customers.

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- Definition

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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- Definition

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

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- Definition

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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- Definition

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

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Remaining duration of performance obligation for which optional exemption was applied not to disclose amount of transaction price allocated to and timing of revenue recognition for remaining performance obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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REVENUE RECOGNITION AND RELATED ALLOWANCES - Concentration (Details) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($) customer	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($) customer	Sep. 30, 2021 USD ($) customer	Sep. 30, 2020 USD ($) customer
Revenue recognition	$ 52,061		$ 52,979	$ 155,207	$ 151,223
Tripartite Agreement-Yescart
Revenue recognition		$ 11,200		11,200
Payment for legal expenditures		$ 400
Sales of contract manufactured products [Member]
Revenue, Remaining Performance Obligation, Amount	$ 3,000			$ 3,000
Revenue, Remaining Performance Obligation, Remaining Period	6 months			6 months
Revenue recognition	$ 2,382		$ 2,152	$ 7,277	$ 7,026
Product Development Services [Member]
Revenue, Remaining Performance Obligation, Amount	$ 400			$ 400
Revenue, Remaining Performance Obligation, Remaining Period	6 months			6 months
Customer concentration \| Revenue \| Customer One [Member]
Concentration Risk, Percentage	0.31%		0.30%	0.29%	0.31%
Customer concentration \| Revenue \| Customer Two [Member]
Concentration Risk, Percentage	0.23%		0.25%	0.22%	0.24%
Customer concentration \| Revenue \| Customer Three [Member]
Concentration Risk, Percentage	0.17%		0.19%	0.15%	0.19%
Customer concentration \| Accounts receivable \| Three Customers [Member]
Number of major customers \| customer	3		3	3	3
Concentration Risk, Percentage				85.00%