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Equity and Stock-based Compensation Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Nov. 29, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Class of Stock [Line Items]        
Share-based compensation expense   $ 169 $ 253  
Authorized stock repurchase amount $ 4,000      
Common stock, par value (USD per share) $ 0.01 $ 0.01   $ 0.01
Stock repurchase program period 1 year      
Shares repurchased (in shares)   0    
Stock Options        
Class of Stock [Line Items]        
Accelerated vesting of options (in shares)   12,500    
Options subject to modification (in shares)   122,500