Schedule of Patents, Trademark Rights (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 1,974	$ 1,498	$ 1,498
Acquisitions	33		592
Amortization	(19)	$ (65)	(116)
Ending balance	$ 1,988		$ 1,974

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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