Annual report pursuant to Section 13 and 15(d)

Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail)

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Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Jan. 02, 2016
Oct. 03, 2015
Jul. 04, 2015
Apr. 04, 2015
Jan. 03, 2015
Sep. 27, 2014
Jun. 28, 2014
Mar. 29, 2014
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Numerator:                      
Net loss attributable to U.S. Auto Parts stockholders' $ (454) $ 8 $ (775) $ (60) $ (2,406) $ (2,494) $ (2,180) $ 201 $ (1,281) $ (6,879) $ (15,634)
Dividends on Series A Convertible Preferred Stock                 (241) (240) (184)
Net loss available to common shares                 $ (1,522) $ (7,119) $ (15,818)
Denominator:                      
Weighted-average common shares outstanding (basic and diluted) (in shares)                 33,946 33,489 32,697
Basic and diluted net loss per share (in dollars per share) $ (0.01) $ 0.00 $ (0.02) $ 0.00 $ (0.07) $ (0.08) $ (0.07) $ 0.00 $ (0.04) $ (0.21) $ (0.48)