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Stockholders' Equity - Restricted Stock Purchased and Retired (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 24, 2020
May 20, 2020
Mar. 30, 2020
Dec. 31, 2019
Nov. 30, 2019
Oct. 31, 2019
Sep. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Stockholders' Equity                  
Total Number of Shares Purchased 2,478 87,249 155,556 9,846 57,980 29,189 18,147 245,283 115,162
Actual Price Paid Per Share (in dollars per share) $ 1.14 $ 0.98 $ 0.65 $ 1.45 $ 1.45 $ 1.75 $ 1.34 $ 0.77 $ 1.51
Fair value of Re-Purchased Shares $ 3,000 $ 85,000 $ 102,000 $ 14,000 $ 84,000 $ 51,000 $ 25,000 $ 190,000 $ 174,000