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Property, Plant and Equipment - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 13,299,000	$ 8,106,000	$ 4,921,000
Assets held-for-sale	0	2,600,000
Note receivable	4,600,000
Prepaid and Other Current Assets
Property, Plant and Equipment [Line Items]
Note receivable	2,400,000
Other non-current assets
Property, Plant and Equipment [Line Items]
Note receivable	2,200,000
Cost of goods sold
Property, Plant and Equipment [Line Items]
Depreciation and amortization	10,100,000	5,700,000	3,700,000
Research and development expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	3,100,000	2,400,000	1,200,000
Selling, general and administrative expenses
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 100,000	$ 71,000	$ 13,000

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group, expected to be sold within a year or the normal operating cycle, if longer.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 22
-Subparagraph (e)
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Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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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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