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Summary of Significant Accounting Policies - Schedule of Financial Assets and Liabilities Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Money Market Funds [Member]
Assets, fair value	$ 8,585	$ 8,585
Money Market Funds [Member] | Level1 [Member]
Assets, fair value	8,585	8,585
Money Market Funds [Member] | Level 2 [Member]
Assets, fair value
Money Market Funds [Member] | Level 3 [Member]
Assets, fair value
Other Money Market Funds [Member]
Assets, fair value	1,999	2,000
Other Money Market Funds [Member] | Level1 [Member]
Assets, fair value	1,999	2,000
Other Money Market Funds [Member] | Level 2 [Member]
Assets, fair value
Other Money Market Funds [Member] | Level 3 [Member]
Assets, fair value
US Treasury Bond [Member]
Assets, fair value	2,999	2,998
US Treasury Bond [Member] | Level1 [Member]
Assets, fair value	2,999	2,998
US Treasury Bond [Member] | Level 2 [Member]
Assets, fair value
US Treasury Bond [Member] | Level 3 [Member]
Assets, fair value
Marketable Securities [Member]
Assets, fair value	4,998	4,998
Marketable Securities [Member] | Level1 [Member]
Assets, fair value	4,998	4,998
Marketable Securities [Member] | Level 2 [Member]
Assets, fair value
Marketable Securities [Member] | Level 3 [Member]
Assets, fair value
Convertible Loan Investment [Member]
Assets, fair value		270
Convertible Loan Investment [Member] | Level1 [Member]
Assets, fair value
Convertible Loan Investment [Member] | Level 2 [Member]
Assets, fair value
Convertible Loan Investment [Member] | Level 3 [Member]
Assets, fair value		$ 270

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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