Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Reconciliation of Intangible Assets

The reconciliation of intangible assets for the nine months ended September 30, 2022 and 2021 (in thousands) was as follows:

	September 30,			September 30,
	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		(1,845	)		(1,845	)
Accumulated amortization at end of period		(47,418	)		(44,958	)
Net book value at end of period	$	20,904		$	23,364