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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Class Of Stock [Line Items] |
Schedule of Stock-Based Compensation Expense Recognized | Total stock-based compensation expense was recognized in our condensed consolidated statements of operations and comprehensive loss as follows (in thousands):
|  | For the Three Months Ended September 30, |  |  | For the Nine Months Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2021 |  |  | 2020 |
Research and development |  | $ | 872 |  |  | $ | 336 |  |  | $ | 2,342 |  |  | $ | 539 |
General and administrative |  |  | 1,171 |  |  |  | 542 |  |  |  | 3,509 |  |  |  | 973 |
Total stock-based compensation |  | $ | 2,043 |  |  | $ | 878 |  |  | $ | 5,851 |  |  | $ | 1,512 |
Common Stock Warrants [Member] |
Class Of Stock [Line Items] |
Schedule of Warrant Activity | The following table shows the warrant activity:
|  | Rollforward of Warrant Activity |
|  | Registered direct warrants, placement agent |  |  | Private placement warrants |  |  | Private placement warrants, placement agent |  |  | Warrants exchanged for common stock |  |  | Warrants exchanged for preferred stock warrants |  |  | Total |
Balance as of December 31, 2020 |  |  | 9,581 |  |  |  | 319,064 |  |  |  | 9,177 |  |  |  | — |  |  |  | — |  |  |  | 337,822 |
Issued |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 509,117 |  |  |  | 298,692 |  |  |  | 807,809 |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cancelled/Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance as of September 30, 2021 |  |  | 9,581 |  |  |  | 319,064 |  |  |  | 9,177 |  |  |  | 509,117 |  |  |  | 298,692 |  |  |  | 1,145,631 |
Preferred Stock Warrants [Member] |
Class Of Stock [Line Items] |
Schedule of Warrant Activity | The following table shows the warrant activity:
| Rollforward of Warrant Activity |
|  | Warrants assumed and replaced in acquisition |  |  | Total |
Balance as of December 31, 2020 |  |  | 55,583.875 |  |  |  | 55,583.875 |
Assumed and replaced |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |
Cancelled/Exchanged |  |  | (5,376.456 | ) |  |  | (5,376.456 | )
Balance as of September 30, 2021 |  |  | 50,207.419 |  |  |  | 50,207.419 |

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