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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2023
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis | The table below presents the balances of assets and liabilities measured at fair value on a recurring basis by level within the hierarchy as (in thousands): Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis
|  | As of September 30, 2023 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalent |  | $ | 14,110 |  |  | $ | 14,110 |  |  | $ | — |  |  | $ | — |
Marketable investments |  | $ | 7,167 |  |  | $ | 7,167 |  |  | $ | — |  |  | $ | — |
|  | As of December 31, 2022 |
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalent |  | $ | 25,180 |  |  | $ | 25,180 |  |  | $ | — |  |  | $ | — |
Marketable investments |  | $ | 7,137 |  |  | $ | 7,137 |  |  | $ | — |  |  | $ | — |
Schedule of Assumptions to Estimate Fair Value of Warrants | The Company utilized the following assumptions to estimate the fair value of the April 2018 Redeemable Warrants: Schedule of Assumptions to Estimate Fair Value of Warrants
|  | September 30, 2023 |  |  | December 31, 2022 |
Underlying price per share |  | $ | 0.46 |  |  | $ | 0.31 |
Exercise price per share |  | $ | 17.16 |  |  | $ | 17.16 |
Risk-free interest rate |  |  | 5.55 | % |  |  | 4.74 | %
Expected holding period |  |  | 0.07 |  |  |  | 0.81 |
Expected volatility |  |  | 85 | % |  |  | 75 | %
Expected dividend yield |  |  | — |  |  |  | — |
Warrants measurement input |  |  | — |  |  |  | — |
The Company utilized the following assumptions to estimate the fair value of the March 2019 Redeemable Warrants:
|  | September 30, 2023 |  |  | December 31, 2022 |
Underlying price per share |  | $ | 0.46 |  |  | $ | 0.31 |
Exercise price per share |  | $ | 8.80 |  |  | $ | 8.80 |
Risk-free interest rate |  |  | 5.53 | % |  |  | 4.67 | %
Expected holding period |  |  | 0.44 |  |  |  | 1.19 |
Expected volatility |  |  | 80 | % |  |  | 70 | %
Expected dividend yield |  |  | — |  |  |  | — |
Warrants measurement input |  |  | — |  |  |  | — |
Schedule of Range of Probabilities | Schedule of Range of Probabilities
Range of Probability |  | Probability |
Low |  |  | 0.5 | %
Medium |  |  | 1.0 | %
High |  |  | 5.0 | %

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- Definition Tabular disclosure of input and valuation technique used to measure fair value and change in valuation approach and technique for each separate class of asset and liability measured on recurring and nonrecurring basis. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb) -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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