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3. REVENUE RECOGNITION (Tables) | 12 Months Ended
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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 |

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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 https://asc.fasb.org/extlink&oid=126920106&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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045 + Details
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