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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2020
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract] |
Fair Value, Assets Measured on Recurring Basis | Assets and liabilities measured at fair value on a recurring basis as of December 31, 2020 and 2019 are summarized below:
|  | As of December 31, 2020
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Earn-out liability |  | $ | — |  |  | $ | — |  |  | $ | 6,865 |  |  | $ | 6,865 |
|  | As of December 31, 2019
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Earn-out liability |  | $ | — |  |  | $ | — |  |  | $ | 11,770 |  |  | $ | 11,770 |
Fair Value Measurements, Nonrecurring | The losses on assets measured at fair value on a nonrecurring, discontinued operation basis are summarized below:
|  | 2020 |  | 2019
Goodwill impairment charge 1 |  | $ | 5,406 |  |  | $ | — |
Valuation allowance on assets held for sale 1 |  | 22,978 |  |  | — |
1 See Note 2, Discontinued Operation and Held for Sale.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 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 (bbb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 3: 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 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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