SCHEDULE OF FAIR VALUE INSTRUMENTS (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Cash equivalents
Money market funds	$ 12,736	$ 39,653
Commercial paper	11,090	14,448
Total cash equivalents	23,826	54,101
Short-term investments
U.S. Treasury bills	32,319	25,135
Corporate debt securities	7,631	10,715
Commercial paper	92,985	77,328
Total short-term investments	132,935	113,178
Total	156,761	167,279
Fair Value, Inputs, Level 1 [Member]
Cash equivalents
Money market funds	12,736	39,653
Commercial paper
Total cash equivalents	12,736	39,653
Short-term investments
U.S. Treasury bills	32,319	25,135
Corporate debt securities
Commercial paper
Total short-term investments	32,319	25,135
Total	45,055	64,788
Fair Value, Inputs, Level 2 [Member]
Cash equivalents
Money market funds
Commercial paper	11,090	14,448
Total cash equivalents	11,090	14,448
Short-term investments
U.S. Treasury bills
Corporate debt securities	7,631	10,715
Commercial paper	92,985	77,328
Total short-term investments	100,616	88,043
Total	111,706	102,491
Fair Value, Inputs, Level 3 [Member]
Cash equivalents
Money market funds
Commercial paper
Total cash equivalents
Short-term investments
U.S. Treasury bills
Corporate debt securities
Commercial paper
Total short-term investments
Total

Commercial paper carrying value.

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Commercial paper short term investment.

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Corporate debt securities.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
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Amount of 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.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an 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.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Debt (bills, notes or bonds) that are issued by the government of the United States which are 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. 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.

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