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Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Patents and Intangibles
Gross Carrying Amount	$ 1,663		$ 1,663
Accumulated Amortization	608		549
Total	1,055		1,114
Total intangible assets (Gross)	2,291		2,229
Total intangible assets (Net)	1,683		1,680
Amortization expense	100	$ 100
Future Amortization
2021 (April 1 - December 31)	177
2022	236
2023	205
2024	184
2025	94
Thereafter	159
Total	1,055		1,114
Patents
Patents and Intangibles
Patents pending	$ 628		$ 566
Patents
Patents and Intangibles
Weighted Average Amortization Period	11 years		11 years
Gross Carrying Amount	$ 413		$ 413
Accumulated Amortization	74		65
Total	339		348
Future Amortization
Total	$ 339		$ 348
Defensive intangible assets
Patents and Intangibles
Weighted Average Amortization Period	4 years		4 years
Gross Carrying Amount	$ 1,125		$ 1,125
Accumulated Amortization	464		421
Total	661		704
Future Amortization
Total	$ 661		$ 704
Customer accounts
Patents and Intangibles
Weighted Average Amortization Period	2 years		2 years
Gross Carrying Amount	$ 125		$ 125
Accumulated Amortization	70		63
Total	55		62
Future Amortization
Total	$ 55		$ 62

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- Definition

Amount of amortization for asset, excluding financial asset and goodwill, lacking physical substance with finite life expected to be recognized after fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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Remaining amortization period of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Amount before accumulated amortization of intangible assets, excluding goodwill.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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