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Components of Other Expense, Net (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Other Income and Expenses [Abstract] |  |
Summary of Components of Other Income, Net | The components of other expense, net, are as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Foreign currency exchange loss | (57) |  |  | (26) |  |  | (66) |  |  | (296) |
Other, net | (127) |  |  | (79) |  |  | (190) |  |  | 102 |
Other expense, net | $ | (184) |  |  | $ | (105) |  |  | $ | (256) |  |  | $ | (194) |
| The components of other expense (income), net, are as follows:
| For the Year Ended
| December 31,
| 2019 |  | 2020
Revaluation of Share Purchase Option | $ | 903 |  |  | $ | — |
Foreign currency exchange loss | 733 |  |  | 672 |
Other income, net | (156) |  |  | (382) |
Other expense, net | $ | 1,480 |  |  | $ | 290 |

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