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Debt (Tables) | 12 Months Ended
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Dec. 31, 2022
Debt Disclosure [Abstract] |
Summary of Calculated Aggregate Fair Values and Assumptions | The following table sets forth the assumptions used and calculated aggregated fair values of the liability classified warrants:
| December 31, 2022 |  | December 31, 2021
Strike price per share | $ | 1.42 |  |  | $ | 2.25 |
Closing price per share | $ | 0.77 |  |  | $ | 2.63 |
Term (years) | 0.53 |  | 1.53
Volatility | 102 | % |  | 186 | %
Risk-free rate | 4.70 | % |  | 0.56 | %
Dividend Yield | — |  | —
Summary of Outstanding Warrants | A summary of the change in fair value of the warrant liability is set forth below:
| 2022 |  | 2021
Balance, beginning of year | $ | 3,605 |  |  | $ | 1,614 |
Warrant issued | — |  |  | — |
Warrant Exercised | — |  |  | (16,148) |
Change in fair value of warrant liability | (3,349) |  |  | 18,139 |
Balance, end of year | $ | 256 |  |  | $ | 3,605 |
A summary of our outstanding warrants is set forth below:
|  | December 31, 2022 |  | December 31, 2021 |  |
Warrant Type |  | Cash Exercise Price per share |  | Number of warrants |  | Cash Exercise Price per share |  | Number of warrants |  |
2020 Convertible Notes warrant |  | $ | 1.42 |  |  | 2,811,315 |  |  | $ | 2.25 |  |  | 1,780,000 |  |  |
Common stock warrant (Series D-1) |  | $ | — |  |  | — |  |  | $ | 2.25 |  |  | 35,555 |  |  |
Common stock warrants (Series F) |  | $ | 9.22 |  |  | 377,402 |  |  | $ | 9.22 |  |  | 377,402 |  |  |
Public Warrants (PHUNW) |  | $ | 11.50 |  |  | 1,761,291 |  |  | $ | 11.50 |  |  | 1,761,291 |  |  |
Private Placement Warrants |  | $ | 11.50 |  |  | 1,658,381 |  |  | $ | 11.50 |  |  | 1,658,381 |  |  |
Unit Purchase Option Warrants |  | $ | 11.50 |  |  | 24,172 |  |  | $ | 11.50 |  |  | 24,172 |  |  |
Total |  |  |  | 6,632,561 |  |  |  |  | 5,636,801 |  |  |
Summary of Interest Expense | The following table sets forth interest expense for our various debt obligations included in the consolidated statements of operations and comprehensive loss:
| Year Ended December 31,
| 2022 |  | 2021
2022 Promissory Note | $ | 903 |  |  | $ | — |
2021 Promissory Note | 318 |  |  | 203 |
2020 Convertible Notes | — |  |  | 1,111 |
Accretion of debt discount - issuance costs | 1,034 |  |  | 1,913 |
Accretion of debt discount - warrants | — |  |  | 1,029 |
All other debt and financing obligations | 151 |  |  | 225 |
Total | $ | 2,406 |  |  | $ | 4,481 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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