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4. REVENUE RECOGNITION (Tables) | 3 Months Ended
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Mar. 31, 2023
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following table provides information about disaggregated revenue by timing of revenue recognition (in thousands):
|  | Three Months Ended March 31, 2023 |
|  | Product |  |  | Royalty |  |  | Contract |  |  |  |
|  | revenue |  |  | revenue |  |  | revenue |  |  | Total |
Timing of revenue recognition: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Products transferred at a point in time |  | $ | 590 |  |  | $ | — |  |  | $ | — |  |  | $ | 590 |
Product and services transferred over time |  |  | — |  |  |  | — |  |  |  | 192 |  |  |  | 192 |
Total |  | $ | 590 |  |  | $ | — |  |  | $ | 192 |  |  | $ | 782 |
|  | Three Months Ended March 31, 2022 |
|  | Product |  |  | Royalty |  |  | Contract |  |  |  |
|  | revenue |  |  | revenue |  |  | revenue |  |  | Total |
Timing of revenue recognition: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Products transferred at a point in time |  | $ | — |  |  | $ | 350 |  |  | $ | — |  |  | $ | 350 |
Product and services transferred over time |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | — |  |  | $ | 350 |  |  | $ | — |  |  | $ | 350 |
Significant Changes in Contract Assets and Contract Liabilities | Significant changes in the contract assets and the contract liabilities balances during the period are as follows (in thousands, except percentages):
|  | March 31, 2023 |  |  | December 31, 2022 |  |  | $ Change |  |  | % Change |
Contract assets |  | $ | 192 |  |  | $ | — |  |  | $ | 192 |  |  |  | — |
Contract liabilities |  |  | (5,676 | ) |  |  | (4,601 | ) |  |  | (1,075 | ) |  |  | 23.4 |
Net contract assets (liabilities) |  | $ | (5,484 | ) |  | $ | (4,601 | ) |  | $ | (883 | ) |  |  | 19.2 |
Estimated Timing of Revenue Recognition | The following table provides information about the estimated timing of revenue recognition (in thousands):
|  | Remainder of 2023 |  |  | 2024 |
Revenue |  | $ | 1,075 |  |  | $ | — |

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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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- 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 https://asc.fasb.org/extlink&oid=126920106&loc=SL49130556-203045 + Details
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