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Equity Incentive Plans (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of fair value of employee stock options estimated using the weighted-average assumptions
   Years ended December 31, 
   2018   2017 
Fair value of the company's common stock on date of grant   $0.95   $0.54 
Expected term    6.5 years    6.5 years 
Risk free interest rate    2.92%   2.02%
Dividend yield   0.00%   0.00%
Volatility    79.0%   79.0%
Fair value of options granted  $0.68   $0.38 
Schedule of total stock-based compensation costs recognized
   Years ended December 31, 
   2018   2017 
Cost of goods sold  $38   $34 
Selling expenses   74    33 
General and administrative   263    274 
Research and development   118    45 
Total  $493   $386 
Schedule of stock-based awards outstanding
Plan  Stock
Options
   Restricted
Stock
   Total 
2016 Employee Plan   1,452    48    1,500 
2016 Director Plan   199    -    199 
Other   500         500 
2005 Employee Plan   1,181    88    1,269 
2005 Director Plan   324    -    324 
    3,656    136    3,792 
Stock-based awards available for grant as of December 31, 2018             1,271 
Schedule of stock options award activity
   Number of
shares
   Weighted-
Average
Exercise
Price
   Weighted-
Average
Contractual
Term
   Aggregate
Intrinsic
Value
 
Outstanding at January 1, 2018   2,269   $0.83           
Options granted   1,546    0.95           
Options exercised   (94)   0.70           
Options forfeited   (23)   0.80           
Options expired   (42)   1.23           
Outstanding at December 31, 2018   3,656   $0.88    7.4   $1,023 
Exercisable at December 31, 2018   1,592   $0.97    5.3   $397 
Schedule of restricted stock award activity
   Number of
shares
   Weighted-
Average
Grant Date
Fair Value
per Share
 
Unvested restricted stock awards outstanding at January1, 2018   381   $0.64 
Restricted stock awards granted   476    1.06 
Restricted stock awards vested   (315)   0.66 
Restricted stock awards forfeited   (406)   1.10 
Unvested restricted stock awards outstanding at December 31, 2018   136   $0.71