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Financial Instruments (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2022
Fair Value Disclosures [Abstract] |
Composition of Financial Instruments | The composition of financial instruments is as follows:
| March 31, 2022
|  |  | Gross Unrealized |  |
| Cost |  | Gains |  | Losses |  | Fair Value
|  |  | (in thousands) |  |
Assets |  |  |  |  |  |  |
Marketable equity investments | $ | 20,005 |  |  | $ | — |  |  | $ | (954) |  |  | $ | 19,051 |
| March 31, 2022
| Fair Value
| (in thousands)
Liabilities |
Contingent consideration (Note 3) | $ | 2,768 |
| December 31, 2021
| Fair Value
| (in thousands)
Liabilities |
Contingent consideration (Note 3) | 2,700 |
Fair Value, Assets Measured on Recurring Basis |
|  |  | Fair Value Measurements at March 31, 2022
| Balance at March 31, 2022 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Assets |  |  |  |  |  |  |
Marketable equity securities | $ | 19,051 |  |  | $ | 19,051 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | 2,768 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,768 |
|  |  | Fair Value Measurements at December 31, 2021
| Balance at December 31, 2021 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Liabilities |  |  |  |  |  |  |
Contingent consideration | 2,700 |  |  | — |  |  | — |  |  | 2,700 |
| $ | 2,700 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,700 |
Fair Value, Liabilities Measured on Recurring Basis |
|  |  | Fair Value Measurements at March 31, 2022
| Balance at March 31, 2022 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Assets |  |  |  |  |  |  |
Marketable equity securities | $ | 19,051 |  |  | $ | 19,051 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Contingent consideration | $ | 2,768 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,768 |
|  |  | Fair Value Measurements at December 31, 2021
| Balance at December 31, 2021 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (in thousands)
Liabilities |  |  |  |  |  |  |
Contingent consideration | 2,700 |  |  | — |  |  | — |  |  | 2,700 |
| $ | 2,700 |  |  | $ | — |  |  | $ | — |  |  | $ | 2,700 |
Summary of Level 3 Financial Instrument Activity | The following summarizes the activity in Level 3 financial instruments:
| Three Months Ended March 31,
| 2022 |  | 2021
Contingent Consideration |  |  |
Beginning balance | $ | 2,700 |  |  | $ | — |
Accretion of discount (1) | 68 |  |  | — |
Ending balance | $ | 2,768 |  |  | $ | — |
_____________________ (1) Changes to the balance associated with the estimated fair value of contingent consideration for the three months ended March 31, 2022 were primarily due to accretion of the related discount.

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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=123874694&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=123874694&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities, 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). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an 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 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&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=123874694&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=123874694&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=123874694&loc=d3e19279-110258 + Details
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