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Significant Accounting Policies - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021 USD ($) d	Dec. 31, 2020 USD ($)
Significant Accounting Policies [Line Items]
Restricted cash	$ 200,000
Allowance for doubtful trade accounts receivable	20,000	$ 0
Inventory raw material	5,500,000	800,000
Inventory work in progress	100,000
Inventory held at contract manufacturing facilities	2,200,000
Inventory finished good	1,000,000.0	200,000
Provision for excess and obsolete inventories	29,000	10,000
Reserve For Pricing Credits And Rights Of Return	14,000	0
Contract asset	0	0
Contract liability	87,000	19,000
Warranty Reserves [Member]
Significant Accounting Policies [Line Items]
Estimated warranty costs	$ 15,000	$ 10,000
Minimum [Member]
Significant Accounting Policies [Line Items]
Revenue Recognition Payment Terms | d	30
Maximum [Member]
Significant Accounting Policies [Line Items]
Revenue Recognition Payment Terms | d	120

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Estimated warranty costs

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount of cash equivalents restricted as to withdrawal or usage. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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