CarParts.com, Inc. Annual report pursuant to Section 13 and 15(d)

Segment Information - Summary of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Segment Reporting Information [Line Items]
Net sales	$ 71,195	$ 73,515	$ 78,055	$ 80,806	$ 67,593	$ 70,648	$ 76,462	$ 76,388	$ 303,571	$ 291,091	$ 283,508
Gross profit	21,522	22,414	23,754	24,592	20,046	21,042	20,868	21,478	92,282	83,434	78,450
Operating costs									91,892	85,489	84,362
Income (loss) from operations	(1,573)	$ (84)	$ 865	$ 1,182	(708)	$ (222)	$ (1,107)	$ (18)	390	(2,055)	(5,912)
Capital expenditures									6,353	7,780	5,556
Depreciation and amortization expense									7,510	7,510	8,923
Total assets, net of accumulated depreciation	82,134				83,756				82,134	83,756	82,907
Base USAP
Segment Reporting Information [Line Items]
Net sales									303,324	290,833	283,211
Gross profit									92,047	83,176	78,153
Operating costs									87,782	82,044	81,887
Income (loss) from operations									4,265	1,132	(3,734)
Capital expenditures									5,414	6,701	4,237
Depreciation and amortization expense									6,351	6,141	7,230
Total assets, net of accumulated depreciation	78,094				78,092				78,094	78,092	74,414
AutoMD
Segment Reporting Information [Line Items]
Net sales									247	258	297
Gross profit									235	258	297
Operating costs									4,110	3,445	2,475
Income (loss) from operations									(3,875)	(3,187)	(2,178)
Capital expenditures									939	1,079	1,319
Depreciation and amortization expense									1,159	1,369	1,693
Total assets, net of accumulated depreciation	$ 4,040				$ 5,664				$ 4,040	$ 5,664	$ 8,493