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Notes Payable (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2021 | Jan. 31, 2021 | May 31, 2020 | Apr. 30, 2019 | Feb. 28, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
2019 MD Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term loan |  |  |  |  | $ 500 |  |  |  |  |  |
Interest rate |  |  |  |  | 8.00% |  |  |  |  |  |
Outstanding due date |  |  |  |  | Feb. 22, 2034 |  |  |  |  |  |
Phantom shares, description |  |  |  |  | The 2019 MD Loan establishes “Phantom Shares,” based on 119,906 shares of Common Stock (based on 863,110 Series C Preferred Shares prior to the Reverse Recapitalization), determined at issuance. |  |  |  |  |  |
Interest income |  |  |  |  |  | $ 500 |  |  | $ 300 |  |
Interest expense |  |  |  |  |  |  | $ 200 |  |  | $ 300 |
Fair value of long-term notes payable |  |  |  |  |  | 800 |  |  | 800 |  | $ 1,100
2019 Cecil Loan [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term loan |  |  |  | $ 100 |  |  |  |  |  |  |
Interest rate |  |  |  | 8.00% |  |  |  |  |  |  |
Outstanding due date |  |  |  | Apr. 30, 2034 |  |  |  |  |  |  |
Phantom shares, description |  |  |  | The 2019 Cecil Loan establishes “Phantom Shares,” based on 23,981 shares of Common Stock (based on 172,622 Series C Preferred Shares prior to the Reverse Recapitalization), determined at issuance. |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 9 | $ 42 |  | 52 | $ 55 |
Fair value of long-term notes payable |  |  |  |  |  | 200 |  |  | 200 |  | $ 200
Amount of income |  |  |  |  |  | 100 |  |  |  |  |
PPP Note [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Note payable |  |  | $ 600 |  |  |  |  |  |  |  |
Percentage of loan amount used for payroll expenses |  |  | 60.00% |  |  |  |  |  |  |  |
Debt extinguishment |  | $ 600 |  |  |  |  |  |  |  |  |
2021 Avenue Loan [Member] | Tranche one [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
First loan amount | $ 20,000 |  |  |  |  |  |  |  |  |  |
Funded amount | 15,000 |  |  |  |  |  |  |  |  |  |
Unfunded amount | 5,000 |  |  |  |  |  |  |  |  |  |
2021 Avenue Loan [Member] | Tranche Two [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Second loan amount | 10,000 |  |  |  |  |  |  |  |  |  |
2021 Avenue Loan [Member] | Notes Payable [Member] |  |  |  |  |  |  |  |  |  |  |
Notes Payable (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |
Term loan | 30,000 |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 600 |  |  | 800 |  |
Accrued debt issuance costs | 500 |  |  |  |  |  |  |  | 75 |  |
Amortization of Debt Issuance Costs | $ 35 |  |  |  |  |  |  |  |  |  |
Conditions for future funding, description | funding of Tranche 2 is subject to evidence reasonably satisfactory to Avenue of receipt of an additional $5.0 million financing through Maryland’s State Incentive Programs and/or other Maryland State programs and mutual agreement of the Company and Avenue. On September 27, 2021, we obtained a waiver from this additional financing requirement for the funding of the remaining $5.0 million of Tranche 1 and exercised the option to postpone principal repayment by one year. We incurred additional issuance costs of $75 thousand upon funding the remaining $5.0 million of Tranche 1, of which $12 thousand has been expensed immediately. Funding of Tranche 2 is also subject to (a) our achievement of a statistically significant result on the primary endpoint as defined within the statistical analysis plan for each respective study, or the totality of the results for any study warrant advancement into a subsequent clinical efficacy study, as reasonably determined by the Company and Avenue with respect to at least two of the following studies: (i) RESCUE-ALS or the Healey ALS Platform Trial; (ii) REPAIR-PD; or (iii) REPAIR-MS (“Performance Milestone 1”); and (b) our receipt of net proceeds of at least $30 million from the sale and issuance of our equity securities (including any private placement or follow-on offering) between May 2, 2021 and June 30, 2022. |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  |  |  | $ 12 |  |
Rate of interest, description |  |  |  |  |  |  |  |  | The loans bear interest at a variable rate per annum equal to the sum of (i) the greater of (A) the prime rate, as published by the Wall Street Journal from time to time or (B) 3.25%, plus (ii) 6.60%. Payments for the loan are interest only for the initial 12 months and can be extended to (i) 12 months (the “First Interest-only Period Extension”) if we achieve Performance Milestone 1 and (ii) up to 36 months if (a) we achieve the First Interest-only Period Extension and (b) have drawn from Tranche 2. On August 16, 2021, we mutually confirmed with Avenue that Performance Milestone 1 and the First Interest-only Period Extension had been achieved. |  |
Additional payment upon maturity, description |  |  |  |  |  |  |  | On the maturity date, an additional payment equal to 4.25% of the funded loans, or $0.6 million, is due in addition to the remaining unpaid principal and accrued interest. |  |  |
Warrant to purchase shares (in Shares) | 115,851 |  |  |  |  |  |  |  |  |  |
Common stock at an exercise price (in Dollars per share) | $ 8.63 |  |  |  |  |  |  |  |  |  |
Tranche warrant adjustment description | Upon the funding of Tranche 2, the Avenue Warrant shall be automatically adjusted to include an additional estimated 86,679 shares of Common Stock, which is equal to 5% of the principal amount of Tranche 2, divided by the lower of (i) the five (5)-day VWAP per share; determined as of the end of trading on the last trading day before the date of issuance of Tranche 2; or (ii) the Next Round Price. |  |  |  |  |  |  |  |  |  |
Convertible note payable | $ 5,000 |  |  |  |  |  |  |  |  |  |
Conversion percentage of common stock price for convertible note payable, percentage | 120.00% |  |  |  |  |  |  |  |  |  |
Trading volume limit for conversion of convertible note payable, percentage | 20.00% |  |  |  |  |  |  |  |  |  |
Threshold for removal of financial covenants, description |  |  |  |  |  |  |  |  | The financial covenant associated with the loan agreement includes maintaining minimum unrestricted cash and cash equivalents of at least $5.0 million; provided that upon our (i) achievement of Performance Milestone 1, and (ii) receiving of net proceeds of at least $30.0 million from the sale and issuance of our equity securities (including any PIPE or follow-on offering) between May 1, 2021 and June 30, 2022, we shall no longer be subject to financial covenants. |  |
Minimum cash balance for loan covenant |  |  |  |  |  |  |  |  | $ 5,000 |  |
Fair value of warrant | $ 1,000 |  |  |  |  |  |  |  |  |  |
Financing costs | $ 500 |  |  |  |  |  |  |  |  |  |
Convertible debt |  |  |  |  |  | $ 5,000 |  |  | $ 5,000 |  |

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