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Condensed Consolidated Statements Of Stockholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Balance at Dec. 30, 2017 $ 80 $ 152,640 $ (158,046) $ (5,326)
Balance, shares at Dec. 30, 2017 79,314      
Stock-based compensation   241   241
Issuance of common stock, net $ 5 1,789   1,794
Issuance of common stock, shares 6,101      
Net loss     (4,673) (4,673)
Balance at Mar. 31, 2018 $ 85 154,670 (162,719) (7,964)
Balance, shares at Mar. 31, 2018 85,415      
Balance at Dec. 30, 2017 $ 80 152,640 (158,046) (5,326)
Balance, shares at Dec. 30, 2017 79,314      
Net loss       (12,734)
Balance at Sep. 29, 2018 $ 138 169,176 (170,780) (1,466)
Balance, shares at Sep. 29, 2018 139,253      
Balance at Dec. 30, 2017 $ 80 152,640 (158,046) (5,326)
Balance, shares at Dec. 30, 2017 79,314      
Net loss       17,100
Balance at Dec. 29, 2018 $ 139 169,355 (175,166) (5,672)
Balance, shares at Dec. 29, 2018 139,283      
Balance at Mar. 31, 2018 $ 85 154,670 (162,719) (7,964)
Balance, shares at Mar. 31, 2018 85,415      
Stock-based compensation   173   173
Issuance of common stock, net $ 17 2,801   2,818
Issuance of common stock, shares 16,393      
Restricted stock units vested and distributed, shares 525      
Warrants issued in lieu of payments   12   12
Net loss     (3,417) (3,417)
Balance at Jun. 30, 2018 $ 102 157,656 (166,136) (8,378)
Balance, shares at Jun. 30, 2018 102,333      
Stock-based compensation   157   157
Issuance of common stock, net $ 36 11,116   11,152
Issuance of common stock, shares 36,920      
Warrants issued in lieu of payments   57   57
Estimated fair value of conversion option, in connection with convertible debt   190   190
Net loss     (4,644) (4,644)
Balance at Sep. 29, 2018 $ 138 169,176 (170,780) (1,466)
Balance, shares at Sep. 29, 2018 139,253      
Balance at Dec. 29, 2018 $ 139 169,355 (175,166) (5,672)
Balance, shares at Dec. 29, 2018 139,283      
Stock-based compensation   342   342
Exercise of stock options   16   16
Exercise of stock options, shares 43      
Common stock issued on conversion of Iliad Note $ 1 374   375
Common stock issued on conversion of Iliad Note (in shares) 1,042      
Net loss     (4,050) (4,050)
Balance at Mar. 30, 2019 $ 140 170,087 (179,216) (8,989)
Balance, shares at Mar. 30, 2019 140,708      
Balance at Dec. 29, 2018 $ 139 169,355 (175,166) $ (5,672)
Balance, shares at Dec. 29, 2018 139,283      
Exercise of stock options, shares       62
Restricted stock units vested and distributed, shares 340      
Net loss       $ (10,677)
Balance at Sep. 28, 2019 $ 154 173,979 (185,843) (11,710)
Balance, shares at Sep. 28, 2019 154,097      
Balance at Mar. 30, 2019 $ 140 170,087 (179,216) (8,989)
Balance, shares at Mar. 30, 2019 140,708      
Stock-based compensation   197   197
Exercise of stock options   6   6
Exercise of stock options, shares 19      
Tax withholdings related to net share settlements of equity awards (in shares) (92)      
Issuance of commitment shares $ 1 (1)    
Issuance of commitment shares (in shares) 818      
Common stock issued on conversion of Iliad Note $ 1 224   225
Common stock issued on conversion of Iliad Note (in shares) 724      
Net loss     (3,519) (3,519)
Balance at Jun. 29, 2019 $ 142 170,513 (182,735) (12,080)
Balance, shares at Jun. 29, 2019 142,177      
Stock-based compensation   243   243
Issuance of common stock, net $ 8 2,449   2,457
Issuance of common stock, shares 8,394      
Restricted stock units vested and distributed, shares 409      
Tax withholdings related to net share settlements of equity awards   (39)   (39)
Tax withholdings related to net share settlements of equity awards (in shares) (130)      
Common stock issued on conversion of Iliad Note $ 4 813   817
Common stock issued on conversion of Iliad Note (in shares) 3,247      
Net loss     (3,108) (3,108)
Balance at Sep. 28, 2019 $ 154 $ 173,979 $ (185,843) $ (11,710)
Balance, shares at Sep. 28, 2019 154,097