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Intangible Assets | 3 Months Ended
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Mar. 31, 2022
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets |
5. | 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 |
The Company amortizes intangible assets with finite lives on a straight-line basis over their respective estimated useful lives of 13 years. Amortization of intangible assets totaled $615,000 for the three months ended March 31, 2022 and 2021. In connection with the Company’s acquisition of Icon Bioscience, Inc., the initial purchase price was attributed to the DEXYCU product intangible asset. This finite-lived intangible asset is being amortized on a straight-line basis over its expected remaining useful life of 9 years at the rate of approximately $2.5 million per year. Amortization expense was reported as a component of cost of sales for the three months ended March 31, 2022 and 2021, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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