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Intangible Assets (Tables) | 3 Months Ended
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Mar. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract] |
Reconciliation of Intangible Assets | The reconciliation of intangible assets for the three months ended March 31, 2022 and 2021 (in thousands) was as follows:
|  | March 31, |  |  | March 31, |
|  | 2022 |  |  | 2021 |
Patented technologies |  |  |  |  |  |  |  |
Gross carrying amount at beginning of period |  | $ | 68,322 |  |  | $ | 68,322 |
Gross carrying amount at end of period |  |  | 68,322 |  |  |  | 68,322 |
Accumulated amortization at beginning of period |  |  | (45,573 | ) |  |  | (43,113 | )
Amortization expense |  |  | (615 | ) |  |  | (615 | )
Accumulated amortization at end of period |  |  | (46,188 | ) |  |  | (43,728 | )
Net book value at end of period |  | $ | 22,134 |  |  | $ | 24,594 |

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- Definition Tabular disclosure of goodwill and intangible assets, which may be broken down by segment or major class. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 + Details
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