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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 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 June 30, |  |  | For the Six Months Ended June 30, |
|  | 2022 |  |  | 2021 |  |  | 2022 |  |  | 2021 |
Research and development |  | $ | 924 |  |  | $ | 785 |  |  | $ | 1,804 |  |  | $ | 1,470 |
General and administrative |  |  | 1,384 |  |  |  | 1,249 |  |  |  | 2,690 |  |  |  | 2,338 |
Total stock-based compensation |  | $ | 2,308 |  |  | $ | 2,034 |  |  | $ | 4,494 |  |  | $ | 3,808 |
Common Stock Warrants [Member] |
Class Of Stock [Line Items] |
Schedule of Warrant Activity | As of June 30, 2022, there were 1,145,631 warrants exercisable into common stock (after rounding for fractional shares and subject to beneficial ownership blockers).
|  | 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 X 1 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 June 30, 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 | As of June 30, 2022, there were 50,207.419 warrants exercisable into Series X 1 Preferred Stock, which are convertible into 2,789,301 shares of common stock (after rounding for fractional shares and subject to beneficial ownership conversion blockers).
|  | Roll Forward of Series X 1 Convertible Preferred Warrant Activity |
|  | Total |
Balance as of December 31, 2021 |  |  | 50,207.419 |
Assumed and replaced |  |  | — |
Exercised |  |  | — |
Cancelled/Expired |  |  | — |
Balance as of June 30, 2022 |  |  | 50,207.419 |

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