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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2020
Stockholders' Equity Note [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
As of March 31, 2020, we had the following outstanding non-tradeable, registered warrants to purchase shares of common stock:

Number of Underlying SharesExercise PriceExpiration
Investor Warrants3,441,803$0.6740January 13, 2025
Placement Agent Warrants240,926$0.9988January 13, 2025
3,682,729
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
March 31,
20202019
Cost of sales$1  $7  
Product development1  28  
Selling, general, and administrative18  508  
Total stock-based compensation$20  $543  
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 comparatively detailed as follows:
Three months ended
March 31,
20202019
Fair value of options issued$0.22  $—  
Exercise price$0.30  $—  
Expected life of options (in years)6.10
Risk-free interest rate0.7 %— %
Expected volatility92.8 %— %
Dividend yield0.0 %0.0 %
Summary of option activity
A summary of option activity under all plans for the three months ended March 31, 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, 2019777,153  $1.04  
Granted431,250  0.30  
Canceled/forfeited(29,800) 0.47  
Expired—  —  
Balance at March 31, 20201,178,603  $0.78  8.0
Vested and expected to vest at March 31, 2020868,008  $0.93  7.9
Exercisable at March 31, 2020113,353  $4.59  5.8
Summary of restricted stock activity
A summary of restricted stock unit activity under all plans for the three months ended March 31, 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, 201933,051  $2.63  
Granted80,000  0.30  
Released  (19,873) 2.72  
Canceled/forfeited  —  —  
Balance at March 31, 202093,178  $0.61  8.7