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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, |
|  | 2022 |  |  | 2021 |
Research and development |  | $ | 880 |  |  | $ | 685 |
General and administrative |  |  | 1,306 |  |  |  | 1,089 |
Total stock-based compensation |  | $ | 2,186 |  |  | $ | 1,774 |
Common Stock Warrants [Member] |
Class Of Stock [Line Items] |
Schedule of Warrant Activity |
|  | Roll Forward of Warrant Activity |
|  | Registered direct warrants, placement agent |  |  | Private placement warrants |  |  | Private placement warrants, placement agent |  |  | Warrants exchanged for common stock |  |  | Warrants exchanged for Series X1 preferred stock |  |  | Total |
Balance as of December 31, 2021 |  |  | 9,581 |  |  |  | 319,064 |  |  |  | 9,177 |  |  |  | 509,117 |  |  |  | 298,692 |  |  |  | 1,145,631 |
Issued |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Exercised |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Cancelled/Expired |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Balance as of March 31, 2022 |  |  | 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 |
|  | Roll Forward of Series X1 Convertible Preferred Warrant Activity |
|  | Total |
Balance as of December 31, 2021 |  |  | 50,207.419 |
Assumed and replaced |  |  | — |
Exercised |  |  | — |
Cancelled/Expired |  |  | — |
Balance as of March 31, 2022 |  |  | 50,207.419 |

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