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CREDIT RISK AND CONCENTRATION - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Concentration Risk |  |  |  |  |
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] |  | $ 24,310 | $ 65,623 | $ 115,944
China |  |  |  |  |
Concentration Risk |  |  |  |  |
Net sales |  |  | 2,286 | 2,439 | $ 3,146
Cash, Cash Equivalents and Short Term Investments | Countries Other than US | Credit Concentration Risk |  |  |  |  |
Concentration Risk |  |  |  |  |
Cash and cash equivalents and short-term investments |  |  | $ 28,600 | $ 35,400 |
Accounts Receivable | Customer Concentration Risk | Customer A |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration of risk (as a percent) |  |  | 1.00% | 1.00% |
Accounts Receivable | Customer Concentration Risk | Customer B |  |  |  |  |
Concentration Risk |  |  |  |  |
Concentration of risk (as a percent) |  |  | 91.00% | 91.00% |
Net sales |  |  | $ 21,000 |  |
Accounts Receivable | Customer Concentration Risk | Customer B | Subsequent Event |  |  |  |  |
Concentration Risk |  |  |  |  |
Net sales |  | $ 16,000 |  |  |
Subsidiaries | Cash, Cash Equivalents and Short Term Investments | China | Credit Concentration Risk |  |  |  |  |
Concentration Risk |  |  |  |  |
Cash and cash equivalents and short-term investments |  |  | $ 12,200 | $ 3,100 |
[1] | Revenue recognized in the years ended December 31, 2020, 2019 and 2018 that was included in deferred revenue (including current and non-current) and customer advances as of the beginning of each respective period was $1.2 million, $2.8 million and $4.0 million, respectively.

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- Definition Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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