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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 + Details
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