Annual report pursuant to Section 13 and 15(d)

Stockholders' Equity and Share-Based Compensation - Share-Based Compensation Plan Information (Details)

v3.19.1
Stockholders' Equity and Share-Based Compensation - Share-Based Compensation Plan Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 31, 2016
Dec. 29, 2018
Dec. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of options granted (in dollars per share)   $ 1.11 $ 1.85
Intrinsic value, options exercised   $ 1 $ 1,911
Unrecognized share-based compensation expense   $ 2,701  
Weighted-average period of unrecognized compensation expense   2 years 29 days  
2016 Equity Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares authorized to issued under condition one (in shares) 2,500,000    
Shares available for future grants (in shares) 3,894,000   7,733,000
Period of share reserve increase 9 years    
Share reserve (in shares) 1,500,000    
Expiration period 10 years    
Option grant vesting period 4 years    
Exercise price of option grants 100.00%    
AutoMd 2014 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted average fair value of options granted (in dollars per share)     $ 0.55
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares withheld to satisfy employees' tax obligation (in shares)   0 260,000
Employees' tax obligation   $ 0 $ 900