Annual report pursuant to Section 13 and 15(d)

Capital Stock, Stock Plans, Warrants, and Stock Based Compensation - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details)

v3.19.1
Capital Stock, Stock Plans, Warrants, and Stock Based Compensation - Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions (Details) - $ / shares
 12 Months Ended
Jul. 26, 2018
Jan. 18, 2018
Oct. 19, 2017
Jul. 27, 2017
Jan. 13, 2017
Dec. 31, 2017
Risk -free interest rate           2.30%
Expected option life           6 years 7 months 6 days
Employee Stock Option Granted [Member]            
Weighted-average fair value per share     $ 1.75 $ 1.88    
Risk -free interest rate [1]     1.98% 1.98%    
Expected volatility of stock [2]     54.64% 53.15%    
Dividend yield     0.00% 0.00%    
Expected option life [3]     5 years 6 years    
Outside Director Stock Options Granted [Member]            
Weighted-average fair value per share $ 3.02 $ 2.55   $ 2.48 $ 2.63  
Risk -free interest rate [1] 2.98% 2.62%   2.32% 2.40%  
Expected volatility of stock [2] 55.34% 57.29%   57.21% 56.32%  
Dividend yield 0.00% 0.00%   0.00% 0.00%  
Expected option life [3] 10 years 10 years   10 years 10 years  
[1] The risk-free interest rate is based on the U.S. Treasury yield in effect at the grant date over the expected term of the option.
[2] The expected volatility is based on historical volatility from our traded Common Stock over the expected term of the option.
[3] The expected option life is based on historical exercises and post-vesting data.