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CREDIT RISK AND CONCENTRATION - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Concentration Risk |  |  |  |  |
Cash and cash equivalents |  |  | $ 49,968 | $ 54,517 |
Increase or decrease in interest rates of short-term investments that will not significantly affect the fair value of investment portfolio (as a percent) |  |  | 10.00% |  |
Net sales | [1] |  | $ 15,753 | 14,052 | $ 15,921
China |  |  |  |  |
Concentration Risk |  |  |  |  |
Net sales |  |  | 2,577 | 1,735 | $ 1,858
Cash and Cash Equivalents | Countries Other than US | Credit Concentration Risk |  |  |  |  |
Concentration Risk |  |  |  |  |
Cash and cash equivalents |  |  | $ 33,500 | $ 43,200 |
Accounts Receivable | Customer Concentration Risk | Customer A |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration of risk (as a percent) |  |  | 0.00% | 0.00% |
Accounts Receivable | Customer Concentration Risk | Customer B |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration of risk (as a percent) |  |  | 79.00% | 88.00% |
Net sales |  |  | $ 10,000 |  |
Accounts Receivable | Customer Concentration Risk | Customer B | Subsequent Event |  |  |  |  |
Concentration Risk |  |  |  |  |
Net sales |  | $ 2,200 |  |  |
Subsidiaries | China |  |  |  |  |
Concentration Risk |  |  |  |  |
Cash and cash equivalents |  |  | 15,300 | $ 13,500 |
Subsidiaries | Cash and Cash Equivalents | China | Credit Concentration Risk |  |  |  |  |
Concentration Risk |  |  |  |  |
Cash and cash equivalents |  |  | $ 15,300 | $ 13,500 |
[1] | Revenue recognized for the years ended December 31, 2023, 2022 and 2021 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each year was $0.1 million, $0.3 million and $0.4 million, respectively.

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483467/210-10-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-4 + Details
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