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Basis of Presentation and Summary of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2020
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,
 2020201920202019
Net sales:    
Commercial$1,456 $1,733 $4,250 $5,847 
MMM products4,508 1,182 8,832 3,327 
Total net sales$5,964 $2,915 $13,082 $9,174 
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,
 2020201920202019
Numerator:  
Net loss$(1,165)$(946)$(6,046)$(6,065)
  
Denominator:
Basic weighted average shares of common stock outstanding *3,308 2,474 3,196 2,455 
   * 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
September 30,		Nine months ended
September 30,
2020201920202019
Balance at beginning of period$215 $342 $195 $258 
Warranty accruals for current period sales22 5 29 34 
Adjustments to existing warranties4 — 23 77 
In kind settlements made during the period(11)(4)(17)(26)
Accrued warranty reserve at end of period$230 $343 $230 $343 
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 September 30, 2020 (in thousands):

Fair Value Measurements at September 30, 2020 Using
Balance as ofQuoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
DescriptionSeptember 30, 2020
Warrant liability$2,928 $— $— $2,928 
Schedule of valuation assumptions
The following inputs were used for the Black-Sholes valuation model at September 30, 2020:
ExpectedRisk-FreeExpected
VolatilityInterest RateLife
Warrants with greater than one-year remaining term
103.18% - 99.38%
0.21% - 0.24%
3.79 - 4.29 years
Level 3 Fair Value Reconciliation
A roll-forward of fair value measurements using significant unobservable inputs (Level 3) for the warrants is as follows (in thousands):
Nine months ended September 30, 2020
Balance January 1, 2020$— 
Issuance of warrants, January 20201,636 
Settlements from exercise(982)
Loss from change in fair value of warrants2,274 
Balance September 30, 2020$2,928