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

3 Months Ended

Mar. 31, 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 March 31,
	2021		2020
Net sales:
Commercial	$	913	$	1,736
MMM products	1,724		2,047
Total net sales	$	2,637	$	3,783

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 March 31,
	2021		2020
Numerator:
Net loss	$	(1,642)	$	(541)
Denominator:
Basic weighted average shares of common stock outstanding *	3,612		3,086
* Shares outstanding for prior periods 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 March 31,
	2021		2020
Balance at beginning of period	$	227	$	195
Warranty accruals for current period sales	17		7
Adjustments to existing warranties	14		44
In kind settlements made during the period	(19)		(6)
Accrued warranty reserve at end of period	$	239	$	240

Schedule 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 March 31, 2020 (in thousands):

			Fair Value Measurements at March 31, 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	March 31, 2020
Warrant liabilities	$	763	$	—	$	—	$	763

Schedule of valuation assumptions

The following inputs were used at March 31, 2020:

	Expected	Risk-Free	Expected
	Volatility	Interest Rate	Life
Warrants with greater than one-year remaining term	97.05%	0.34% - 0.36%	4.29 - 4.79 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):

	Three months ended March 31, 2020
Balance January 1, 2020	$	—
Issuance of warrants, January 2020	1,636
Gain from change in fair value of warrants	(873)
Balance March 31, 2020	$	763