CarParts.com, Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies and Nature of Operations (Details Textual)

Summary of Significant Accounting Policies and Nature of Operations (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 29, 2013	Dec. 29, 2012	Jun. 30, 2012	Jun. 29, 2013 Segment	Jun. 30, 2012	Dec. 29, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Asset impairment charges				$ 6,077	$ 0
Impairment loss on property and equipment	4,832	1,960		4,832	0
Total Assets for Auto MD related to capitalized website and software development costs	69,296	88,877		69,296		88,877
Segment Revenue, AutoMD	67,889		80,719	133,294	168,155
Segment Total Assets, AutoMD	69,296	88,877		69,296		88,877
Total expenses incurred	28,355		25,372	51,235	52,486
Summary of Significant Accounting Policies and Nature of Operations (Textual) [Abstract]
Decrease in revenue, percentage	20.70%			15.90%
Net loss	9,567		1,696	12,910	2,484	35,978	15,137
Original maturity of money market funds and short-term investments purchased				90 days
Other than temporary impairment charges on investments				0	0
Inventory	34,181	42,727		34,181		42,727
Inventory in-transit	5,301	6,418		5,301		6,418
Impairment loss on intangible assets, finite-lived		1,745
Limited warranty description				The Company or the vendors supplying its products provide the Company’s customers limited warranties on certain products that range from 30 days to lifetime.
Standard product warranty useful life, minimum				1 year
Standard product warranty useful life, maximum				5 years
Extended product warranty description				The product brands that include the extended warranty coverage are offered at three different service levels: (a) a five year unlimited product replacement, (b) a five year one-time product replacement, and (c) a three year one-time product replacement.
Advertising costs	4,571		5,241	8,908	11,321
The likeliness that the tax position will be realized upon ultimate settlement				50.00%
Unrecognized tax benefits, interest or penalties	0			0
Number of reporting units				2
Number of reportable segments				2
Property and equipment [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Impairment loss on property and equipment	4,832
Intangible assets [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Impairment loss on property and equipment	1,245
Website and Software Development [Member] \| Minimum [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Capitalization amount amortized on straight line basis over a period				2 years
Website and Software Development [Member] \| Maximum [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Capitalization amount amortized on straight line basis over a period				3 years
Internally developed software [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Impairment loss on property and equipment				4,832
AutoMD [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Segment Revenue, AutoMD				0
AutoMD [Member] \| Website and Software Development [Member]
Summary of Significant Accounting Policies and Nature of Operations (Additional Textual) [Abstract]
Total Assets for Auto MD related to capitalized website and software development costs	2,502	2,059		2,502		2,059
Segment Total Assets, AutoMD	2,502	2,059		2,502		2,059
Total expenses incurred	$ 631		$ 571	$ 1,217	$ 1,108