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Other Assets
 12 Months Ended
Dec. 31, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets

7.Other Assets

Other assets consist of the following:

December 31,

2021

2020

 

Patents, at cost

$

10,024

$

9,859

Accumulated amortization

(5,360

)

(5,071

)

Deposits on capital items

18,026

22,255

Marlin trade name

7,800

7,800

Other

8,953

6,779

$

39,443

$

41,622

The capitalized cost of patents is amortized using the straight-line method over their useful lives. Expenses related to patent amortization was $0.3 million in 2021, 2020, and 2019. The estimated annual patent amortization expense for each of the next five years is $0.2 million. Costs incurred to maintain existing patents are charged to expense in the year incurred. The Marlin trade name will be amortized using the straight-line method over its useful life. The estimated annual trade name amortization cost for each of the next five years is $0.4 million. The intangible asset related to Marlin customer relationships are included in Other above and will be amortized using the straight-line method over its useful life. The estimated annual customer relationship name amortization expense for each of the next five years is $0.1 million.