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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
As of June 30, 2020, we had the following outstanding non-tradeable, registered warrants to purchase shares of common stock:

Number of Underlying SharesExercise PriceExpiration
Investor Warrants673,361$3.3700January 13, 2025
Placement Agent Warrants48,185
$4.9940
January 13, 2025
721,546
Summary of stock-based compensation expense
The following table summarizes stock-based compensation expense and the impact it had on operations for the periods presented (in thousands):

Three months ended
June 30,		Six months ended
June 30,
2020201920202019
Cost of sales$—  $—  $1  $7  
Product development1  (6) 2  22  
Selling, general, and administrative40  (14) 58  494  
Total stock-based compensation$41  $(20) $61  $523  
Schedule of valuation assumptions Estimates utilized in the calculation include the expected life of the option, risk-free interest rate, and expected volatility, and are further detailed below. There were no options issued the six months ended June 30, 2019.
Six months ended
June 30,
2020
Fair value of options issued$1.18  
Exercise price$1.55  
Expected life of options (in years)6.2
Risk-free interest rate0.8 %
Expected volatility92.9 %
Dividend yield0.0 %
Summary of option activity
A summary of option activity under all plans for the six months ended June 30, 2020 is presented as follows:

Number of
Options*		Weighted
Average
Exercise
Price Per
Share		Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 2019155,031  $5.23  
Granted89,400  1.55  
Canceled/forfeited(16,921) 11.34  
Balance at June 30, 2020227,510  $3.33  7.8
Vested and expected to vest at June 30, 2020174,271  $3.77  7.8
Exercisable at June 30, 202012,370  $27.75  4.6
*Options have been restated for the 1-for-5 reverse stock split
Summary of restricted stock activity
A summary of restricted stock unit activity under all plans for the six months ended June 30, 2020 is presented as follows:
Restricted
Stock Units*		Weighted
Average
Grant
Date
Fair Value		Weighted
Average
Remaining
Contractual
Life (in years)
Balance at December 31, 20196,603  $13.17  
Granted16,000  1.50  
Released(4,068) 13.65  
Canceled/forfeited(1) 12.40  
Balance at June 30, 202018,534  $2.99  8.5
*Restricted stock units have been restated for the 1-for-5 reverse stock split