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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Fair Value Measurements |  |
Schedule of fair value measurements | The Company measures its cash equivalents at amortized cost, which approximates fair value. Money market funds categorized as Level 1 as of September 30, 2021 and December 31, 2020 are as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020
Cash equivalents: | ​ | ​ |  | ​ | ​ |
Money market funds |  | $ | 24,461 |  | $ | 24,460
​ |  | $ | 24,461 |  | $ | 24,460
| The Company measures its cash equivalents at amortized cost, which approximates fair value. Money market funds categorized as Level 1 as of December 31, 2020 and 2019 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Cash equivalents: | ​ | ​ | ​ | ​ | ​ | ​
Money market funds | ​ | $ | 24,460 | ​ | $ | 24,379
​ | ​ | $ | 24,460 | ​ | $ | 24,379

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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