3. REVENUE RECOGNITION (Tables)

12 Months Ended

Dec. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table provides information about disaggregated revenue by timing of revenue recognition, (in thousands):

	Year Ended December 31, 2022
			License and
	Product		royalty		Contract
	revenue		revenue		revenue		Total
Timing of revenue recognition:
Products transferred at a point in time	$	—	$	664	$	—	$	664
Product and services transferred over time		—		—		—		—
Total	$	—	$	664	$	—	$	664

	Year Ended December 31, 2021
			License and
	Product		royalty		Contract
	revenue		revenue		revenue		Total
Timing of revenue recognition:
Products transferred at a point in time	$	—	$	2,500	$	—	$	2,500
Product and services transferred over time		—		—		—		—
Total	$	—	$	2,500	$	—	$	2,500

	Year Ended December 31, 2020
			License and
	Product		royalty		Contract
	revenue		revenue		revenue		Total
Timing of revenue recognition:
Products transferred at a point in time	$	1,347	$	1,718	$	4	$	3,069
Product and services transferred over time		—		—		21		21
Total	$	1,347	$	1,718	$	25	$	3,090

Significant Changes in Contract Assets and Contract Liabilities

The following table provides information about receivables, contract assets, and contract liabilities from contracts with customers (in thousands):

	December 31,
	2022		2021		2020
Accounts receivable, net	$	—	$	—	$	—
Accrued liabilities		—		—		—
Deferred revenue		—		—		—
Contract liabilities		4,601		5,265		7,765

Under Topic 606, our rights to consideration are presented separately depending on whether those rights are conditional or unconditional. We present our unconditional rights to consideration as “accounts receivable” in our Balance Sheet.

Significant changes in the contract assets and the contract liabilities balances during the period are as follows (in thousands, except percentages):

	December 31,			December 31,
	2022			2021			$Change		% Change
Contract assets	$	—		$	—		$	—		—
Contract liabilities		(4,601	)		(5,265	)		664		12.6
Net contract assets (liabilities)	$	(4,601	)	$	(5,265	)	$	664		12.6