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Net Loss Per Share Available to Common Stockholders (“EPS”) - Schedule of basic and diluted net loss per common share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 26, 2020
Jun. 27, 2020
Mar. 28, 2020
Dec. 31, 2019
Sep. 28, 2019
Jun. 29, 2019
Mar. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Numerator:                      
Net loss available to common stockholders $ (25,077) $ (19,285) $ (10,205) $ 1,815 $ (452) $ 4,099 $ (9,441) $ (6,649) $ (52,752) $ (12,443) $ (29,886)
Denominator:                      
Weighted average common shares outstanding—basic (in shares)                 62,290,445 42,274,777 6,287,172
Dilutive effect of stock equivalents resulting from stock options, RSUs, common stock warrants, preferred stock warrants and convertible preferred stock (as converted) (in shares)                 0 0 0
Weighted average common shares outstanding—diluted (in shares)                 62,290,445 42,274,777 6,287,172
Net loss per share available to common stockholders—basic and diluted (in dollars per share)                 $ (0.85) $ (0.29) $ (4.75)