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Basis of Presentation and Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Disaggregation of revenue

The following table provides a disaggregation of product net sales for the periods presented (in thousands):

			Three months ended September 30,															Nine months ended September 30,
			2021						2020									2021						2020
Net sales:
Commercial			$	1,522					$	1,456								$	3,513					$	4,250
MMM products			1,227						4,508									3,947						8,832
Total net sales			$	2,749					$	5,964								$	7,460					$	13,082

Reconciliation of basic and diluted income (loss) per share

The following table presents a reconciliation of basic and diluted loss per share computations (in thousands):

			Three months ended September 30,												Nine months ended September 30,
			2021						2020						2021						2020
Numerator:
Net loss			$	(1,140)					$	(1,165)					$	(5,255)					$	(6,046)
Denominator:
Basic and diluted weighted average shares of common stock outstanding *			5,086						3,308						4,309						3,196

*Shares outstanding for the nine months ended September 30, 2020 have been restated for the 1-for-5 stock split effective June 11, 2020.

Schedule of warranty activity

The following table summarizes warranty activity for the periods presented (in thousands):

			Three months ended September 30,												Nine months ended September 30,
			2021						2020						2021						2020
Balance at beginning of period			$	239					$	215					$	227					$	195
Warranty accruals for current period sales			10						22						49						29
Adjustments to existing warranties			4						4						16						23
In kind settlements made during the period			(13)						(11)						(52)						(17)
Accrued warranty reserve at end of period			$	240					$	230					$	240					$	230

Summary of assets and liabilities measured on recurring basis

The following table provides a summary of the financial assets and liabilities measured at fair value on a recurring basis as of September 30, 2020 (in thousands):

									Fair Value Measurements at September 30, 2020 Using
			Balance as of						Quoted Prices in Active Markets for Identical Assets  (Level 1)						Significant Other Observable Inputs (Level 2)						Significant Unobservable Inputs  (Level 3)
Description			September 30, 2020
Warrant liabilities			$	2,928					$	—					$	—					$	2,928

Schedule of valuation assumptions

The following inputs were used at September 30, 2020:

Expected

Risk-Free

Expected

Volatility

Interest Rate

Life

Warrants with greater than one-year remaining term

103.18% - 99.38%

0.21% - 0.24%

3.79 - 4.29 years

Level 3 fair value reconciliation

A roll-forward of fair value measurements using significant unobservable inputs (Level 3) for the warrants is as follows (in thousands):

			Nine months ended September 30, 2020
Balance January 1, 2020			$	—
Issuance of warrants, January 2020			1,636
Settlements from exercise			(982)
Gain from change in fair value of warrants			2,274
Balance September 30, 2020			$	2,928

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Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.

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