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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis | The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, as of December 31, 2020:
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | December 31, 2020
Assets |  |  |  |  |  |  |
United States government debt securities | $ | — |  |  | $ | 48,061 |  |  | $ | — |  |  | $ | 48,061 |
Other | — |  |  | 264 |  |  | — |  |  | 264 |
Total | $ | — |  |  | $ | 48,325 |  |  | $ | — |  |  | $ | 48,325 |
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, as of December 31, 2019:
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | December 31, 2019
Assets |  |  |  |  |  |  |
United States government debt securities | $ | — |  |  | $ | 8,996 |  |  | $ | — |  |  | $ | 8,996 |
Other | — |  |  | 264 |  |  | — |  |  | 264 |
Total | $ | — |  |  | $ | 9,260 |  |  | $ | — |  |  | $ | 9,260 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table summarizes the changes in the Level 3 investments during the year ended December 31, 2019.
|  |  | 2019
Beginning balance |  |  | $ | 191 |
Retained interest in deconsolidated subsidiary |  |  | 14,239 |
Dividend income from investments in preferred stock |  |  | 48 |
Net unrealized appreciation in the fair value of the investments in equity securities and preferred stock |  |  | 7,446 |
Proceeds from sale of equity securities |  |  | (21,587) |
Proceeds to be received from preferred stock |  |  | (337) |
Ending balance |  |  | $ | — |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation | The changes in the fair value of the Level 3 liability during the years ended December 31, 2020 and 2019 were as follows:
| 2020 |  | 2019
Beginning balance | $ | 585 |  |  | $ | 585 |
Change in fair value of contingent consideration recognized in selling, general, and administrative expenses | (585) |  |  | — |
Ending balance | $ | — |  |  | $ | 585 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 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=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + 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 (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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