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Stockholders' Equity - Warrants (Details) - $ / shares | Mar. 31, 2022 | Dec. 31, 2021
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Class of Warrant or Right [Roll Forward] |  |
Number of warrants (in shares) | 5,636,801 | 5,636,801
2020 Convertible Note warrant |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 2.25 | $ 2.25
Number of warrants (in shares) | 1,780,000 | 1,780,000
Common stock warrant (Series D-1) |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 2.25 | $ 2.25
Number of warrants (in shares) | 35,555 | 35,555
Common stock warrants (Series F) |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 9.22 | $ 9.22
Number of warrants (in shares) | 377,402 | 377,402
Public warrants (PHUNW) |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 1,761,291 | 1,761,291
Private placement warrants |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 1,658,381 | 1,658,381
Unit purchase option warrants |  |
Class of Warrant or Right [Roll Forward] |  |
Exercise price per share (in dollars per share) | $ 11.50 | $ 11.50
Number of warrants (in shares) | 24,172 | 24,172

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