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Components of Other Expense, Net | 9 Months Ended | 12 Months Ended
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Sep. 30, 2021 | Dec. 31, 2020
Other Income and Expenses [Abstract] |  |
Components of Other Income, Net | Components of Other Expense, 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) |
| Components of Other Expense (Income), Net 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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- Definition The entire disclosure for other income or other expense items (both operating and nonoperating). Sources of nonoperating income or nonoperating expense that may be disclosed, include amounts earned from dividends, interest on securities, profits (losses) on securities, net and miscellaneous other income or income deductions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -URI http://asc.fasb.org/topic&trid=2122503 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 610 -URI http://asc.fasb.org/topic&trid=49130413 + Details
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