Intangibles (Tables)

12 Months Ended

Dec. 31, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Amortization of Intangible Assets Acquired

Amortization of intangible assets acquired is calculated using the straight-line method over the estimated useful lives of the assets.

	Estimated Life	December 31,			December 31,
	(years)	2021			2020
Capitalized patent costs	17-20	$	10,219		$	9,708
Intangible assets acquired:
Purchased intellectual property	3-10		250			250
Existing technology	5		1,560			1,560
Customer relationships	7		290			290
Gross intangible assets			12,319			11,808
Accumulated amortization			(5,708	)		(5,196	)
Intangibles, net		$	6,611		$	6,612

Amortization Expense on Intangible Assets

Amortization expense on intangible assets was as follows:   

	Year Ended		Year Ended
	December 31,		December 31,
	2021		2020
Amortization expense	$	576	$	559

Estimated Future Aggregate Amortization Expense

For intangible assets recorded at December 31, 2021, the estimated future aggregate amortization expense for the years ending December 31, 2022 through December 31, 2026 is as follows:

	Amortization
Year ending December 31:	Expense
2022	$	537
2023		526
2024		514
2025		494
2026		462