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Intangible Assets | 12 Months Ended
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Dec. 31, 2021
Goodwill And Intangible Assets Disclosure [Abstract] |
Intangible Assets |
5. | Intangible Assets
The reconciliation of intangible assets for the years ended December 31, 2021 and 2020 (in thousands):
|  | Year Ended |  |  | Year Ended |
|  | December 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
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 |  |  | (43,113 | ) |  |  | (40,653 | )
Amortization expense |  |  | (2,460 | ) |  |  | (2,460 | )
Accumulated amortization at end of period |  |  | (45,573 | ) |  |  | (43,113 | )
Net book value at end of period |  | $ | 22,749 |  |  | $ | 25,209 |
The net book value of the Company’s intangible assets at December 31, 2021 and 2020 is summarized as follows (in thousands):
|  |  |  |  |  |  |  |  |  | Estimated |
|  |  |  |  |  |  |  |  |  | Remaining |
|  |  |  |  |  |  |  |  |  | Useful Life at |
|  | December 31, |  |  | December 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |  |  | 2021 |
|  |  |  |  |  |  |  |  |  | (Years) |
Patented technologies |  |  |  |  |  |  |  |  |  |  |  |
DEXYCU / Verisome |  | $ | 22,749 |  |  | $ | 25,209 |  |  |  | 9.25 |
|  | $ | 22,749 |  |  | $ | 25,209 |  |  |  |  |
The Company amortizes its intangible assets with finite lives on a straight-line basis over their respective estimated useful lives. Amortization expense totaled $2.5 million in each of the two years ended December 31, 2021 and 2020, respectively. In connection with the Icon Acquisition, the initial purchase price of $32.0 million 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 9.25 years at the rate of approximately $2.5 million per year. Amortization expense was reported as a component of cost of sales for the years ended December 31, 2021 and 2020, 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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