Intangibles (Tables)

9 Months Ended

Sep. 30, 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	September 30,			December 31,
	(years)	2021			2020
Capitalized patent costs	17-20	$	10,082		$	9,708
Intangible assets acquired:
Purchased patents and intellectual property	3-10		250			250
Existing technology	5		1,560			1,560
Customer relationships	7		290			290
Gross intangible assets			12,182			11,808
Accumulated amortization			(5,568	)		(5,196	)
Intangibles, net		$	6,614		$	6,612