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

Subsequent Events (Details) (Revolving Line of Credit Facility, USD $)	12 Months Ended	0 Months Ended		12 Months Ended	5 Months Ended	6 Months Ended	12 Months Ended
	Jan. 03, 2015	Jan. 02, 2015	Jan. 01, 2015	Jan. 01, 2015	May 31, 2016	Dec. 31, 2016	Dec. 31, 2016
Subsequent Event [Line Items]
Number of consecutive days excess availability is above required amount	45 days
JPMorgan Chase Bank
Subsequent Event [Line Items]
Net orderly liquidation value inventory advance rate		90.00%	85.00%
Minimum availability required trigger amount (if less than)	4,000,000	$ 4,000,000		$ 6,000,000
Number of consecutive days excess availability is above required amount		45 days
Line of Credit \| JPMorgan Chase Bank
Subsequent Event [Line Items]
Net orderly liquidation value inventory advance rate		90.00%	85.00%
Minimum availability required trigger amount (if less than)		4,000,000		6,000,000
Number of consecutive days excess availability is above required amount		45 days
Scenario, Forecast \| JPMorgan Chase Bank
Subsequent Event [Line Items]
Minimum availability required trigger amount (if less than)						2,000,000	2,000,000
Testing period the Company is subject to a fixed charge coverage ratio					5 months		12 months
Scenario, Forecast \| Line of Credit \| JPMorgan Chase Bank
Subsequent Event [Line Items]
Minimum availability required trigger amount (if less than)							$ 2,000,000
Number of consecutive days excess availability is above required amount							45 days
Testing period the Company is subject to a fixed charge coverage ratio					5 months		12 months