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Employee retention credits benefits.

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Employee retention credits benefits receivable.

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Number of customer.

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Extended 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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Working capital.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of obligation due after one year or beyond the normal operating cycle, if longer.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Description of Business, Basis of Presentation and Principles of Consolidation - Additional Information (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Segment Customer	Mar. 31, 2021 USD ($) Customer	Dec. 31, 2021 USD ($) Customer
Significant Accounting Policies [Line Items]
Number of operating segments \| Segment	1
Employee retention credit benefits	$ 0
Employee retention credits benefits receivable	400,000		$ 400,000
Accumulated deficit	(214,830,550)		$ (208,333,031)
Working capital	16,900,000
Long-term liabilities	8,700,000
Debt instrument, covenant unrestricted cash	$ 12,500,000
SVB Term Loan \| Minimum
Significant Accounting Policies [Line Items]
Debt instrument, interest at floating rate	5.00%
Cost of Product and Product-related Services Revenue
Significant Accounting Policies [Line Items]
Employee retention credit benefits		$ 100,000
Selling, General and Administrative
Significant Accounting Policies [Line Items]
Employee retention credit benefits		300,000
Research and Development
Significant Accounting Policies [Line Items]
Employee retention credit benefits		$ 100,000
Sales Revenue, Net \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers \| Customer	3	2
Sales Revenue, Net \| Customer Concentration Risk \| Customers Located Outside Of United States
Significant Accounting Policies [Line Items]
Sales revenue percentage	18.00%	41.00%
Sales Revenue, Net \| Customer Concentration Risk \| Customer Three
Significant Accounting Policies [Line Items]
Sales revenue percentage	12.00%
Sales Revenue, Net \| Customer Concentration Risk \| Customer One
Significant Accounting Policies [Line Items]
Sales revenue percentage	24.00%	19.00%
Sales Revenue, Net \| Customer Concentration Risk \| Customer Two
Significant Accounting Policies [Line Items]
Sales revenue percentage	20.00%	15.00%
Accounts Payable \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers \| Customer	1		2
Accounts Payable \| Customer Concentration Risk \| Customer One
Significant Accounting Policies [Line Items]
Sales revenue percentage	28.00%		28.00%
Accounts Payable \| Customer Concentration Risk \| Customer Two
Significant Accounting Policies [Line Items]
Sales revenue percentage			16.00%
Accounts Receivable \| Customer Concentration Risk
Significant Accounting Policies [Line Items]
Number of customers \| Customer	3		2
Accounts Receivable \| Customer Concentration Risk \| Customer Three
Significant Accounting Policies [Line Items]
Sales revenue percentage	10.00%		10.00%
Accounts Receivable \| Customer Concentration Risk \| Customer One
Significant Accounting Policies [Line Items]
Sales revenue percentage	50.00%		18.00%
Accounts Receivable \| Customer Concentration Risk \| Customer Two
Significant Accounting Policies [Line Items]
Sales revenue percentage	11.00%		17.00%
Accounts Receivable \| Customer Concentration Risk \| Customer Four
Significant Accounting Policies [Line Items]
Sales revenue percentage			10.00%