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3. REVENUE RECOGNITION (Tables) | 12 Months Ended
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Dec. 31, 2021
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table provides information about disaggregated revenue by timing of revenue recognition, (in thousands): Disaggregation of Revenue
|  |  | 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
|  |  | Year Ended December 31, 2019
|  |  |  |  |  | License and |  |  |  |  |  |
|  |  | Product |  |  | royalty |  |  | Contract |  |  |
|  |  | revenue |  |  | revenue |  |  | revenue |  |  | Total
Timing of revenue recognition: |  |  |  |  |  |  |  |  |  |  |  |
Products transferred at a point in time |  | $ | 5,345 |  | $ | 99 |  | $ | 178 |  | $ | 5,622
Product and services transferred over time |  |  | - |  |  | - |  |  | 3,264 |  |  | 3,264
Total |  | $ | 5,345 |  | $ | 99 |  | $ | 3,442 |  | $ | 8,886
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): Accounts Receivable, Accrued Liabilities, Deferred Revenue and Contract Liabilities with Customers
|  |  | December 31,
|  |  | 2021 |  |  | 2020
Accounts receivable, net |  | $ | - |  | $ | -
Accrued liabilities |  |  | - |  |  | -
Deferred revenue |  |  | - |  |  | -
Contract liabilities |  |  | 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): Significant Changes in Contract Assets and Contract Liabilities
|  |  | December 31, |  |  | December 31, |  |  |  |  |
|  |  | 2021 |  |  | 2020 |  |  | $ Change |  | % Change
Contract assets |  | $ | - |  | $ | - |  | $ | - |  | -
Contract liabilities |  |  | (5,265) |  |  | (7,765) |  |  | 2,500 |  | 32.2
Net contract assets (liabilities) |  | $ | (5,265) |  | $ | (7,765) |  | $ | 2,500 |  | 32.2
Estimated Timing of Revenue Recognition | The following table provides information about the estimated timing of revenue recognition (in thousands): Estimated Timing of Revenue Recognition
|  |  | 2022 |  |  | 2023
License and royalty revenue |  | $ | 2,500 |  | $ | -

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045 + Details
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- Definition Tabular disclosure of expected timing for satisfying remaining performance obligation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130556-203045 + Details
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