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Fair Value Measurements - Schedule of Fair Value Measurement Inputs and Valuation Techniques (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets, fair value	$ 13,853	$ 3,573
Level1 [Member]
Assets, fair value	13,583	3,573
Level 2 [Member]
Assets, fair value
Level 3 [Member]
Assets, fair value	270
Money Market Funds [Member]
Assets, fair value	8,585	1,052
Money Market Funds [Member] | Level1 [Member]
Assets, fair value	8,585	1,052
Money Market Funds [Member] | Level 2 [Member]
Assets, fair value
Money Market Funds [Member] | Level 3 [Member]
Assets, fair value
Cash Equivalents [Member]
Assets, fair value	8,585	1,052
Cash Equivalents [Member] | Level1 [Member]
Assets, fair value	8,585	1,052
Cash Equivalents [Member] | Level 2 [Member]
Assets, fair value
Cash Equivalents [Member] | Level 3 [Member]
Assets, fair value
Other Money Market Funds [Member]
Assets, fair value	2,000
Other Money Market Funds [Member] | Level1 [Member]
Assets, fair value	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	2,998	2,521
US Treasury Bond [Member] | Level1 [Member]
Assets, fair value	2,998	2,521
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	2,521
Marketable Securities [Member] | Level1 [Member]
Assets, fair value	4,998	2,521
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

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- 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=117815213&loc=d3e19207-110258

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