CarParts.com (PRTS) 10-Q 1 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Oct. 01, 2016	Oct. 28, 2016
Document And Entity Information [Abstract]
Entity Registrant Name	U.S. Auto Parts Network, Inc.
Entity Central Index Key	1,378,950
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Oct. 1, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q3
Trading Symbol	PRTS
Amendment Flag	false
Entity Common Stock, Shares Outstanding		34,977,717

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Oct. 01, 2016	Jan. 02, 2016
Current assets:
Cash and cash equivalents	$ 7,505	$ 5,537
Short-term investments	32	65
Accounts receivable, net of allowances of $90 and $17 at October 1, 2016 and January 2, 2016, respectively	2,991	3,236
Inventory	49,471	51,216
Other current assets	3,291	2,475
Total current assets	63,290	62,529
Property and equipment, net	18,005	18,431
Intangible assets, net	1,115	1,476
Other non-current assets	1,056	1,320
Total assets	83,466	83,756
Current liabilities:
Accounts payable	33,130	25,523
Accrued expenses	7,663	7,267
Revolving loan payable	0	11,759
Current portion of capital leases payable	534	521
Other current liabilities	4,146	3,854
Total current liabilities	45,473	48,924
Capital leases payable, net of current portion	9,915	10,168
Deferred income taxes	650	944
Other non-current liabilities	1,710	1,577
Total liabilities	57,748	61,613
Commitments and contingencies
Stockholders’ equity:
Series A convertible preferred stock, $0.001 par value; $1.45 per share liquidation value or aggregate of $6,017; 4,150 shares authorized; 4,150 shares issued and outstanding at October 1, 2016 and January 2, 2016	4	4
Common stock, $0.001 par value; 100,000 shares authorized; 34,977 and 34,137 shares issued and outstanding at October 1, 2016 and January 2, 2016	35	34
Additional paid-in capital	179,300	176,873
Accumulated other comprehensive income	456	440
Accumulated deficit	(155,107)	(157,011)
Total stockholders’ equity	24,688	20,340
Noncontrolling interest	1,030	1,803
Total equity	25,718	22,143
Total liabilities and stockholders’ equity	$ 83,466	$ 83,756

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Oct. 01, 2016	Jan. 02, 2016
Accounts receivable, allowances	$ 90,000	$ 17,000
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	34,977,000	34,137,000
Common stock, shares outstanding (in shares)	34,977,000	34,137,000
Series A Convertible Preferred Stock
Series A convertible preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Share liquidation value (in dollars per share)	$ 1.45	$ 1.45
Share aggregate value	$ 6,017,000	$ 6,017,000
Series A convertible preferred stock, shares authorized (in shares)	4,150,000	4,150,000
Series A convertible preferred stock, shares issued (in shares)	4,150,000	4,150,000
Series A convertible preferred stock, shares outstanding (in shares)	4,150,000	4,150,000

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Income Statement [Abstract]
Net sales		$ 73,515	$ 70,648	$ 232,376	$ 223,498
Cost of sales	[1]	51,101	49,606	161,616	160,110
Gross profit		22,414	21,042	70,760	63,388
Operating expenses:
Marketing		10,788	10,684	33,324	32,684
General and administrative		4,434	4,292	13,545	12,957
Fulfillment		5,596	4,881	17,292	14,919
Technology		1,560	1,292	4,275	3,830
Amortization of intangible assets		120	115	361	345
Total operating expenses	[2]	22,498	21,264	68,797	64,735
(Loss) income from operations		(84)	(222)	1,963	(1,347)
Other income (expense):
Other income, net		8	8	25	41
Interest expense		(291)	(277)	(889)	(922)
Total other expense, net		(283)	(269)	(864)	(881)
(Loss) income before income taxes		(367)	(491)	1,099	(2,228)
Income tax benefit		(7)	(203)	(212)	(602)
Net (loss) income including noncontrolling interests		(360)	(288)	1,311	(1,626)
Net loss attributable to noncontrolling interests		(258)	(296)	(773)	(799)
Net (loss) income attributable to U.S. Auto Parts		(102)	8	2,084	(827)
Other comprehensive loss attributable to U.S. Auto Parts:
Foreign currency translation adjustments		(16)	(28)	(29)	(50)
Total other comprehensive loss attributable to U.S. Auto Parts		(16)	(28)	(29)	(50)
Comprehensive (loss) income attributable to U.S. Auto Parts		$ (118)	$ (20)	$ 2,055	$ (877)
Net income (loss) attributable to U.S. Auto Parts per share:
Basic net income (loss) per share (in dollars per share)		$ 0	$ 0	$ 0.05	$ (0.03)
Diluted net income (loss) per share (in dollars per share)		$ 0	$ 0	$ 0.05	$ (0.03)
Weighted average common shares outstanding:
Shares used in computation of basic net income (loss) per share (in shares)		34,932	34,018	34,728	33,900
Shares used in computation of diluted net income (loss) per share (in shares)		34,932	34,018	39,923	33,900
[1]	Excludes depreciation and amortization expense which is included in marketing, general and administrative and fulfillment expense.
[2]	Operating costs for AutoMD primarily consist of depreciation and amortization on fixed assets and personnel costs. Indirect costs are not allocated to AutoMD.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015
Operating activities
Net income (loss) including noncontrolling interests	$ 1,311	$ (1,626)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	5,601	5,618
Amortization of intangible assets	361	345
Deferred income taxes	(299)	(674)
Share-based compensation expense	2,475	1,726
Stock awards issued for non-employee director service	6	2
Amortization of deferred financing costs	61	61
Gain from disposition of assets	0	(13)
Changes in operating assets and liabilities:
Accounts receivable	245	261
Inventory	1,745	2,177
Other current assets	(751)	(706)
Other non-current assets	168	93
Accounts payable and accrued expenses	7,825	(460)
Other current liabilities	291	649
Other non-current liabilities	257	(105)
Net cash provided by operating activities	19,296	7,348
Investing activities
Additions to property and equipment	(4,570)	(5,800)
Proceeds from sale of property and equipment	0	13
Cash paid for intangible assets	(125)	(25)
Net cash used in investing activities	(4,695)	(5,812)
Financing activities
Borrowings from revolving loan payable	11,976	8,970
Payments made on revolving loan payable	(23,735)	(11,700)
Proceeds from stock options	734	102
Payments on capital leases	(449)	(297)
Statutory tax withholding payment for share-based compensation	(969)	(438)
Payment of liabilities related to financing activities	(100)	(100)
Preferred stock dividends paid	(61)	0
Net cash used in financing activities	(12,604)	(3,463)
Effect of exchange rate changes on cash	(29)	(50)
Net change in cash and cash equivalents	1,968	(1,977)
Cash and cash equivalents, beginning of period	5,537	7,653
Cash and cash equivalents, end of period	7,505	5,676
Supplemental disclosure of non-cash investing and financing activities:
Accrued asset purchases	1,050	902
Property acquired under capital lease	211	1,588
Unrealized (loss) gain on investments	(2)	(2)
Supplemental disclosure of cash flow information:
Cash paid during the period for income taxes	69	84
Cash paid during the period for interest	$ 825	$ 886

Basis of Presentation and Descr

Basis of Presentation and Description of Company	9 Months Ended
	Oct. 01, 2016
Accounting Policies [Abstract]
Basis of Presentation and Description of Company	Basis of Presentation and Description of Company U.S. Auto Parts Network, Inc. (including its subsidiaries) is a leading online provider of aftermarket auto parts and accessories and was established in 1995. The Company entered the e-commerce sector by launching its first website in 2000 and currently derives the majority of its revenues from online sales channels. The Company sells its products to individual consumers through a network of websites and online marketplaces. Through AutoMD.com, a majority-owned subsidiary, the Company also educates consumers on maintenance and service of their vehicles. The site provides auto information, with tools for diagnosing car troubles, locating repair shops and do-it-yourself (“DIY”) repair guides. Our flagship consumer websites are located at www.autopartswarehouse.com , www.carparts.com , www.jcwhitney.com and www.AutoMD.com and our corporate website is located at www.usautoparts.net . References to the “Company,” “we,” “us,” or “our” refer to U.S. Auto Parts Network, Inc. and its consolidated subsidiaries. The Company’s products consist of collision parts serving the body repair market, engine parts to serve the replacement parts market, and performance parts and accessories. The collision parts category is primarily comprised of body parts for the exterior of an automobile. Our parts in this category are typically replacement parts for original body parts that have been damaged as a result of a collision or through general wear and tear. The majority of these products are sold through our websites. In addition, we sell an extensive line of mirror products, including our own private-label brand called Kool-Vue™, which are marketed and sold as aftermarket replacement parts and as upgrades to existing parts. The engine parts category is comprised of engine components and other mechanical and electrical parts. These parts serve as replacement parts for existing engine parts and are generally used by professionals and do-it-yourselfers for engine and mechanical maintenance and repair. We also offer performance versions of many parts sold in each of the above categories. Performance parts and accessories generally consist of parts that enhance the performance of the automobile, upgrade existing functionality of a specific part or improve the physical appearance or comfort of the automobile. The Company is a Delaware C corporation and is headquartered in Carson, California. The Company has employees located in both the United States and the Philippines. Basis of Presentation The consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to U.S. Securities and Exchange Commission (“SEC”) Form 10-Q and Article 10 of SEC Regulation S-X. In the opinion of management, the accompanying consolidated financial statements contain all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position of the Company as of October 1, 2016 and the consolidated results of operations and cash flows for the thirteen and thirty-nine weeks ended October 1, 2016 and October 3, 2015 . The Company’s results for the interim periods are not necessarily indicative of the results that may be expected for any other interim period, or for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended January 2, 2016 , which was filed with the SEC on March 11, 2016 and all our other periodic filings, including Current Reports on Form 8-K, filed with the SEC after the end of our 2015 fiscal year, and throughout the date of this report. During the thirteen and thirty-nine weeks ended October 1, 2016 , the Company had a net loss of $102 and net income of $2,084 , respectively, compared to net income of $8 and a net loss of $827 during the thirteen and thirty-nine weeks ended October 3, 2015 , respectively. Based on our current operating plan, we believe that our existing cash, cash equivalents, investments, cash flows from operations and available debt financing will be sufficient to finance our operational cash needs through at least the next twelve months. Segment Data The Company operates in two reportable operating segments. The criteria the Company uses to identify operating segments are primarily the nature of the products we sell or services we provide and the consolidated operating results that are regularly reviewed by our chief operating decision maker to assess performance and make operating decisions. We identified two reportable operating segments, the core auto parts business ("Base USAP"), and an online automotive repair information source of which we are a majority stockholder ("AutoMD"). Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, “Compensation - Stock Compensation” (“ASU 2016-09”). The objective of this update is to simplify accounting related to stock compensation. The new standard is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company is evaluating the effect that ASU 2016-09 will have on the consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has the effect of the standard on ongoing financial reporting been determined.

Intangible Assets, Net

Intangible Assets, Net	9 Months Ended
	Oct. 01, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	Intangible Assets, Net Intangible assets consisted of the following at October 1, 2016 and January 2, 2016 (in thousands): October 1, 2016 January 2, 2016 Useful Life Gross Carrying Amount Accumulated Amort. and Impairment Net Carrying Amount Gross Carrying Amount Accumulated Amort. and Impairment Net Carrying Amount Intangible assets subject to amortization: Product design intellectual property 4 years $ 2,750 $ (2,556 ) $ 194 $ 2,750 $ (2,361 ) $ 389 Patent license agreements 3 - 5 years 562 (312 ) $ 250 562 (219 ) $ 343 Domain and trade names 10 years 1,407 (736 ) $ 671 1,407 (663 ) $ 744 Total $ 4,719 $ (3,604 ) $ 1,115 $ 4,719 $ (3,243 ) $ 1,476 Intangible assets subject to amortization are amortized on a straight-line basis. Amortization expense relating to intangible assets for the thirteen weeks ended October 1, 2016 and October 3, 2015 was $120 and $115 , respectively. Amortization expense relating to intangible assets for the thirty-nine weeks ended October 1, 2016 and October 3, 2015 was $361 and $345 , respectively. The following table summarizes the future estimated annual amortization expense for these assets: 2016 $ 121 2017 344 2018 185 2019 100 2020 100 Thereafter 265 Total $ 1,115

Borrowings

Borrowings	9 Months Ended
	Oct. 01, 2016
Debt Disclosure [Abstract]
Borrowings	Borrowings The Company maintains an asset-based revolving credit facility ("Credit Facility") that provides for, among other things, a revolving commitment in an aggregate principal amount of up to $30,000 , which is subject to a borrowing base derived from certain receivables, inventory, and property and equipment. The Credit Facility matures on April 26, 2017 . At October 1, 2016 , our outstanding revolving loan balance was $0 . On May 6, 2016, the Company and JPMorgan Chase Bank, N.A. (“JPMorgan”) entered into a Ninth Amendment to Credit Agreement and Second Amendment to Pledge and Security Agreement (the “Amendment”), which amended the Credit Agreement previously entered into by the Company, certain of its domestic subsidiaries and JPMorgan on April 26, 2012 (as amended, the “Credit Agreement”) and the Pledge and Security Agreement previously entered into by the Company, certain of its domestic subsidiaries and JPMorgan on April 26, 2012. Pursuant to the Amendment, letters of credit can be issued if after giving effect to such issuance, the letters of credit exposure shall not exceed $15,000 , which was an increase from the previously agreed upon $6,000 . As of October 1, 2016 , our outstanding letters of credit balance was $9,283 . Loans drawn under the Credit Facility bear interest, at the Company’s option, at a per annum rate equal to either (a) LIBOR plus an applicable margin of 1.25% , or (b) a “base rate” subject to an increase or reduction by up to 0.25% per annum based on the Company's fixed charge coverage ratio. At October 1, 2016 , the Company’s LIBOR based interest rate was 1.81% (on $0 principal) and the Company’s prime based rate was 3.25% (on $0 principal). A commitment fee, based upon undrawn availability under the Credit Facility bearing interest at a rate of 0.25% per annum, is payable monthly. Under the terms of the Credit Agreement, cash receipts are deposited into a lock-box, which are at the Company’s discretion unless the “cash dominion period” is in effect, during which cash receipts will be used to reduce amounts owing under the Credit Agreement. The cash dominion period is triggered in an event of default or if excess availability is less than the $3,600 for five business days (on a cumulative basis) and will continue until, during the preceding 60 consecutive days, no event of default existed and excess availability has been greater than $3,600 at all times (with such trigger subject to adjustment based on the Company's revolving commitment). In addition, in the event that “excess availability,” as defined under the Credit Agreement, is less than $2,400 , the Company shall be required to maintain a minimum fixed charge coverage ratio of 1.0 to 1.0 (with the trigger subject to adjustment based on the Company's revolving commitment). The Company's excess availability was $13,871 at October 1, 2016 . As of the date hereof, the cash dominion period has not been in effect; accordingly, no principal payments are due.

Stockholders' Equity and Share-

Stockholders' Equity and Share-Based Compensation	9 Months Ended
	Oct. 01, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stockholders' Equity and Share-Based Compensation	Stockholders’ Equity and Share-Based Compensation Non-Controlling Interest Non-controlling interests represent equity interests in consolidated subsidiaries that are not attributable, either directly or indirectly, to the Company (i.e., minority interests). Non-controlling interests consist of the minority equity holders' proportionate share of the equity of AutoMD. Ownership interests in subsidiaries held by parties other than the Company are presented as non-controlling interests within stockholders' equity, separately from the equity held by the Company. Revenues, expenses, net income (loss) and other comprehensive loss are reported in the consolidated financial statements at the consolidated amounts, which includes amounts allocated to both the Company's interest and the non-controlling interests in AutoMD. Net loss and other comprehensive loss is then attributed to the Company's interest and the non-controlling interests. Net income (loss) to non-controlling interests is deducted from net income (loss) in the consolidated statements of comprehensive operations to determine net income (loss) attributable to the Company's common stockholders. The following table summarizes the Company’s stock option activity under the AutoMD 2014 Equity Incentive Plan (the "AMD Plan") for the thirty-nine weeks ended October 1, 2016 , and details regarding the options outstanding and exercisable at October 1, 2016 : Shares (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Options outstanding, January 2, 2016 1,430 $1.00 Granted 10 $1.00 Exercised — — Expired — — Forfeited (35 ) $1.00 Options outstanding, October 1, 2016 1,405 $1.00 8.45 $ — Vested and expected to vest at October 1, 2016 1,044 $1.00 8.44 $ — Options exercisable, October 1, 2016 463 $1.00 8.34 $ — At October 1, 2016 , 545 shares were available for future grants under the AMD Plan. The weighted-average fair value of options granted and outstanding as of October 1, 2016 and October 3, 2015 was $ 0.55 and $ 0.54 , respectively. The intrinsic value of stock options at the date of exercise is the difference between the fair value of the stock at the date of the balance sheet and the exercise price. During the thirty-nine weeks ended October 1, 2016 and October 3, 2015 , the options had $0 intrinsic value. The Company had $278 of unrecognized share-based compensation expense related to stock options outstanding as of October 1, 2016 , which expense is expected to be recognized over a weighted-average period of 2.44 years. Options exercised under all share-based compensation plans are granted net of the minimum statutory withholding requirements that we pay in cash to the appropriate taxing authorities on behalf of our employees. For those employees who elect not to receive shares net of the minimum statutory withholding requirements, the appropriate taxes are paid directly by the employee. During the thirteen and thirty-nine weeks ended October 1, 2016 , we withheld 0 shares to satisfy $0 of employees' tax obligations and 0 shares related to the net settlement of the stock options. U.S. Auto Parts Network Options and Restricted Stock Units The Company had the following common stock option activity during the thirty-nine weeks ended October 1, 2016 : • Granted options to purchase 980 common shares. • Forfeitures of 44 options to purchase common shares. • Expiration of 80 options to purchase common shares. The following table summarizes the Company’s restricted stock unit ("RSU") activity for the thirty-nine weeks ended October 1, 2016 , and details regarding the awards outstanding and exercisable at October 1, 2016 (in thousands): Shares Weighted Weighted Average Aggregate Awards outstanding, January 2, 2016 804 $ — Awarded 954 $ — Vested (774 ) $ — Forfeited (30 ) $ — Awards outstanding, October 1, 2016 954 $ — 0.87 $ 3,137 Vested and expected to vest at October 1, 2016 865 $ — 0.84 $ 2,847 During the thirty-nine weeks ended October 1, 2016 , all RSU's that vested were time-based. For the majority of RSUs awarded, the number of shares issued on the date the RSUs vest is net of the minimum statutory withholding requirements that we pay in cash to the appropriate taxing authorities on behalf of our employees. For those employees who elect not to receive shares net of the minimum statutory withholding requirements, the appropriate taxes are paid directly by the employee. During the thirty-nine weeks ended October 1, 2016 , we withheld 131 shares to satisfy $371 of employees' tax obligations. Although shares withheld are not issued, they are treated as a common stock repurchase in our consolidated financial statements, as they reduce the number of shares that would have been issued upon vesting. For the thirteen and thirty-nine weeks ended October 1, 2016 , we recorded compensation expense of $ 821 and $2,537 , respectively. As of October 1, 2016 , there was unrecognized compensation expense of $895 related to unvested RSUs based on awards that are expected to vest. The unrecognized compensation expense is expected to be recognized over a weighted-average period of 0.87 years.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	9 Months Ended
	Oct. 01, 2016
Earnings Per Share [Abstract]
Net Income (Loss) Per Share	Net Income (Loss) Per Share The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Net income (loss) per share: Numerator: Net (loss) income attributable to U.S. Auto Parts $ (102 ) $ 8 2,084 (827 ) Dividends on Series A Convertible Preferred Stock 61 61 180 180 Net (loss) income available to common shares $ (163 ) $ (53 ) $ 1,904 $ (1,007 ) Denominator: Weighted-average common shares outstanding (basic) 34,932 34,018 34,728 33,900 Common equivalent shares from common stock options, preferred stock and warrants — — 5,195 — Weighted-average common shares outstanding (diluted) 34,932 34,018 39,923 33,900 Basic net income (loss) per share $ 0.00 $ 0.00 $ 0.05 $ (0.03 ) Diluted net income (loss) per share $ 0.00 $ 0.00 $ 0.05 $ (0.03 ) The weighted-average anti-dilutive securities, which are excluded from the calculation of diluted earnings per share due to the Company's net income available to common shares position for the periods then ended (including securities that would otherwise be excluded from the calculation of diluted earnings per share due to the Company's stock price), are as follows (in thousands): Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Common stock warrants 20 50 20 50 Series A Convertible Preferred Stock 4,150 4,150 — 4,150 Restricted stock units 967 861 968 853 Options to purchase common stock 1,142 6,125 2,107 5,960 Total 6,279 11,186 3,095 11,013

Income Taxes

Income Taxes	9 Months Ended
	Oct. 01, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company is subject to U.S. federal income tax as well as income tax of foreign and state tax jurisdictions. The tax years 2012-2015 remain open to examination by the major taxing jurisdictions to which the Company is subject, except the Internal Revenue Service for which the tax years 2013-2015 remain open. For the thirteen and thirty-nine weeks ended October 1, 2016 the effective tax rate for the Company was 1.9% and 19.3% , respectively. The Company's effective tax rate for the thirteen and thirty-nine weeks ended October 1, 2016 differed from the U.S. federal statutory rate primarily as a result of the recording of valuation allowance against the pre-tax losses that was offset by the tax benefit resulting from the reduction of excess book basis in the Company's investment in AutoMD over its tax basis due to AutoMD's pre-tax losses. For the thirteen and thirty-nine weeks ended October 3, 2015 , the effective tax rate for the Company was 41.3% and 27.0% , respectively. The Company’s effective tax rate for the thirteen and thirty-nine weeks ended October 3, 2015 differed from the U.S. federal statutory rate primarily as a result of the recording of valuation allowance against the pre-tax losses.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Oct. 01, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Facilities Leases The Company’s corporate headquarters is located in Carson, California, and has a lease term through October 2020. The Company also leases warehouse space in LaSalle, Illinois and in Chesapeake, Virginia. The Company’s Philippines subsidiary leases office space under an agreement through April 2020. Facility rent expense for the thirteen and thirty-nine weeks ended October 1, 2016 was $437 and $1,241 , respectively, compared to $395 and $1,159 for the thirteen and thirty-nine weeks ended October 3, 2015 , respectively. Minimum lease commitments under non-cancellable operating leases as of October 1, 2016 were as follows (in thousands): 2016 $ 412 2017 1,651 2018 1,671 2019 1,249 2020 542 Thereafter — Total $ 5,525 Capital lease commitments as of October 1, 2016 were as follows (in thousands): 2016 $ 309 2017 1,311 2018 1,319 2019 1,304 2020 1,129 Thereafter 12,910 Total minimum payments required 18,282 Less amount representing interest 7,833 Present value of minimum capital lease payments $ 10,449 Legal Matters Asbestos . A wholly-owned subsidiary of the Company, Automotive Specialty Accessories and Parts, Inc. and its wholly-owned subsidiary Whitney Automotive Group, Inc. ("WAG"), are named defendants in several lawsuits involving claims for damages caused by installation of brakes during the late 1960’s and early 1970’s that contained asbestos. WAG marketed certain brakes, but did not manufacture any brakes. WAG maintains liability insurance coverage to protect its and the Company’s assets from losses arising from the litigation and coverage is provided on an occurrence rather than a claims made basis, and the Company is not expected to incur significant out-of-pocket costs in connection with this matter that would be material to its consolidated financial statements. The Company is subject to legal proceedings and claims which arise in the ordinary course of its business. As of the date hereof, the Company believes that the final disposition of such matters will not have a material adverse effect on the financial position, results of operations or cash flow of the Company. The Company maintains liability insurance coverage to protect the Company’s assets from losses arising out of or involving activities associated with ongoing and normal business operations.

Segment Information

Segment Information	9 Months Ended
	Oct. 01, 2016
Segment Reporting [Abstract]
Segment information	Segment information As described in Note 1 above, the Company operates in two reportable segments identified as Base USAP, which is the core auto parts business, and AutoMD, an online automotive repair source of which the Company is a majority stockholder. Segment information is prepared on the same basis that our chief executive officer, who is our chief operating decision maker, manages the segments, evaluates financial results, and makes key operating decisions. Management evaluates the performance of its operating segments based on net sales, gross profit and income (loss) from operations. Operating income (loss) represents earnings (loss) before other income, interest expense and income taxes. The identifiable assets by segment disclosed in this note are those assets specifically identifiable within each segment. Summarized segment information for our continuing operations from the two reportable segments for the periods presented is as follows (in thousands): Base USAP AutoMD Consolidated Thirteen weeks ended October 1, 2016 Net sales $ 73,452 $ 63 $ 73,515 Gross profit $ 22,371 $ 43 $ 22,414 Operating costs (1) $ 21,732 $ 766 $ 22,498 Income (loss) from operations $ 639 $ (723 ) $ (84 ) Capital expenditures $ 1,480 $ 203 $ 1,683 Depreciation and amortization $ 1,611 $ 286 $ 1,897 Total assets, net $ 79,771 $ 3,695 $ 83,466 Thirteen weeks ended October 3, 2015 Net sales $ 70,573 $ 75 $ 70,648 Gross profit $ 20,967 $ 75 $ 21,042 Operating costs (1) $ 20,367 $ 897 $ 21,264 Income (loss) from operations $ 600 $ (822 ) $ (222 ) Capital expenditures $ 1,636 $ 332 $ 1,968 Depreciation and amortization $ 1,539 $ 323 $ 1,862 Total assets, net $ 73,946 $ 6,315 $ 80,261 Thirty-nine weeks ended October 1, 2016 Net sales $ 232,197 $ 179 $ 232,376 Gross profit $ 70,604 $ 156 $ 70,760 Operating costs (1) $ 66,485 $ 2,312 $ 68,797 Income (loss) from operations $ 4,119 $ (2,156 ) $ 1,963 Capital expenditures $ 3,835 $ 735 $ 4,570 Depreciation and amortization $ 4,711 $ 890 $ 5,601 Total assets, net $ 79,771 $ 3,695 $ 83,466 Thirty-nine weeks ended October 3, 2015 Net sales $ 223,309 $ 189 $ 223,498 Gross profit $ 63,199 $ 189 $ 63,388 Operating costs (1) $ 62,322 $ 2,413 $ 64,735 Loss from operations $ 877 $ (2,224 ) $ (1,347 ) Capital expenditures $ 4,974 $ 826 $ 5,800 Depreciation and amortization $ 4,571 $ 1,047 $ 5,618 Total assets, net $ 73,946 $ 6,315 $ 80,261 (1) Operating costs for AutoMD primarily consist of depreciation and amortization on fixed assets and personnel costs. Indirect costs are not allocated to AutoMD. The following table summarizes the approximate distribution of Base USAP revenue by product type. Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Private Label Collision 49% 45% 50% 47% Engine 16% 15% 15% 14% Performance 1% 1% 1% 1% Branded Collision 2% 2% 2% 2% Engine 13% 15% 13% 14% Performance 19% 22% 19% 22% Total 100% 100% 100% 100%

AutoMD

AutoMD	9 Months Ended
	Oct. 01, 2016
Noncontrolling Interest [Abstract]
AutoMD	AutoMD On October 8, 2014, AutoMD entered into a Common Stock Purchase Agreement ("Purchase Agreement") to sell an aggregate of 7,000 shares of AutoMD common stock at a purchase price of $1.00 per share to third-party investors and investors that are affiliated with two of our board members. The Company retained 64.1% of AutoMD's outstanding common stock, and continues to consolidate AutoMD. In connection with the sale of the shares of AutoMD, the Company recorded an increase to additional paid-in-capital of $2,534 . This amount is equal to the increase in the Company’s interest in the net assets of AutoMD, resulting from this sale of common shares valued at $3,847 , less the related deferred tax liability of $1,313 . The Purchase Agreement also limits the use of proceeds from the sale of AutoMD common stock to only general operating purposes of AutoMD. The Company cannot use or borrow any of the proceeds without the approval of AutoMD's Board of Directors. In addition to the Purchase Agreement, AutoMD entered into an Investor Rights Agreement. The Investor Rights Agreement includes certain demand and piggyback registration rights, and restrictions on transfers or dilutive transactions involving AutoMD common stock. Prior to October 8, 2017, the Company is prohibited from transferring shares of AutoMD owned by U.S. Auto Parts or enter into any transaction or arrangement (including, without limitation, any sale, gift, merger or consolidation) that would result in U.S. Auto Parts owning, at any time, less than 50% of the shares of capital stock of the Company without the prior written consent of AutoMD shareholders. In the event of a proposed transfer or dilutive transaction for which any shareholder does not provide its written consent, in the alternative, upon not less than 30 days prior written notice to such non-consenting party, the Company may elect, at its sole option, to purchase all shares of the AutoMD common stock then owned by any non-consenting shareholder at a purchase price equal to $1.00 per share (as adjusted for any stock combinations, splits, recapitalizations, etc.) plus an annual rate of 10% thereon, compounded annually, and effect such transfer. On October 19, 2016, the Company purchased 2,000 shares of AutoMD common stock at a purchase price of $1.00 per share pursuant to its funding milestone obligation under the Purchase Agreement. As a result, the Company increased its ownership interest in AutoMD to 67.4% of AutoMD's outstanding common stock. The table below presents the effect of the Company's ownership interest in AutoMD on the Company's equity during the thirty-nine weeks ended October 1, 2016 : Noncontrolling Interest Balance, January 2, 2016 $ 1,803 Net loss allocable to noncontrolling interest (773 ) Balance, October 1, 2016 $ 1,030

Basis of Presentation and Des15

Basis of Presentation and Description of Company (Policies)	9 Months Ended
	Oct. 01, 2016
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and with the instructions to U.S. Securities and Exchange Commission (“SEC”) Form 10-Q and Article 10 of SEC Regulation S-X. In the opinion of management, the accompanying consolidated financial statements contain all adjustments, consisting of normal recurring adjustments, necessary to present fairly the consolidated financial position of the Company as of October 1, 2016 and the consolidated results of operations and cash flows for the thirteen and thirty-nine weeks ended October 1, 2016 and October 3, 2015 . The Company’s results for the interim periods are not necessarily indicative of the results that may be expected for any other interim period, or for the full year. These unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our Annual Report on Form 10-K for the year ended January 2, 2016 , which was filed with the SEC on March 11, 2016 and all our other periodic filings, including Current Reports on Form 8-K, filed with the SEC after the end of our 2015 fiscal year, and throughout the date of this report.
Segment Data	Segment Data The Company operates in two reportable operating segments. The criteria the Company uses to identify operating segments are primarily the nature of the products we sell or services we provide and the consolidated operating results that are regularly reviewed by our chief operating decision maker to assess performance and make operating decisions. We identified two reportable operating segments, the core auto parts business ("Base USAP"), and an online automotive repair information source of which we are a majority stockholder ("AutoMD").
Recent Accounting Pronouncements	Recent Accounting Pronouncements In March 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2016-09, “Compensation - Stock Compensation” (“ASU 2016-09”). The objective of this update is to simplify accounting related to stock compensation. The new standard is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. Early adoption is permitted. The Company is evaluating the effect that ASU 2016-09 will have on the consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has the effect of the standard on ongoing financial reporting been determined.

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	9 Months Ended
	Oct. 01, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Intangible assets consisted of the following at October 1, 2016 and January 2, 2016 (in thousands): October 1, 2016 January 2, 2016 Useful Life Gross Carrying Amount Accumulated Amort. and Impairment Net Carrying Amount Gross Carrying Amount Accumulated Amort. and Impairment Net Carrying Amount Intangible assets subject to amortization: Product design intellectual property 4 years $ 2,750 $ (2,556 ) $ 194 $ 2,750 $ (2,361 ) $ 389 Patent license agreements 3 - 5 years 562 (312 ) $ 250 562 (219 ) $ 343 Domain and trade names 10 years 1,407 (736 ) $ 671 1,407 (663 ) $ 744 Total $ 4,719 $ (3,604 ) $ 1,115 $ 4,719 $ (3,243 ) $ 1,476
Summary of Future Estimated Annual Amortization Expense	The following table summarizes the future estimated annual amortization expense for these assets: 2016 $ 121 2017 344 2018 185 2019 100 2020 100 Thereafter 265 Total $ 1,115

Stockholders' Equity and Shar17

Stockholders' Equity and Share-Based Compensation (Tables)	9 Months Ended
	Oct. 01, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Stock Option Activity	The following table summarizes the Company’s stock option activity under the AutoMD 2014 Equity Incentive Plan (the "AMD Plan") for the thirty-nine weeks ended October 1, 2016 , and details regarding the options outstanding and exercisable at October 1, 2016 : Shares (in thousands) Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value Options outstanding, January 2, 2016 1,430 $1.00 Granted 10 $1.00 Exercised — — Expired — — Forfeited (35 ) $1.00 Options outstanding, October 1, 2016 1,405 $1.00 8.45 $ — Vested and expected to vest at October 1, 2016 1,044 $1.00 8.44 $ — Options exercisable, October 1, 2016 463 $1.00 8.34 $ —
Summary of Restricted Stock Unit Activity	The following table summarizes the Company’s restricted stock unit ("RSU") activity for the thirty-nine weeks ended October 1, 2016 , and details regarding the awards outstanding and exercisable at October 1, 2016 (in thousands): Shares Weighted Weighted Average Aggregate Awards outstanding, January 2, 2016 804 $ — Awarded 954 $ — Vested (774 ) $ — Forfeited (30 ) $ — Awards outstanding, October 1, 2016 954 $ — 0.87 $ 3,137 Vested and expected to vest at October 1, 2016 865 $ — 0.84 $ 2,847

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	9 Months Ended
	Oct. 01, 2016
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Income (Loss) Per Share	The following table sets forth the computation of basic and diluted net loss per share (in thousands, except per share data): Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Net income (loss) per share: Numerator: Net (loss) income attributable to U.S. Auto Parts $ (102 ) $ 8 2,084 (827 ) Dividends on Series A Convertible Preferred Stock 61 61 180 180 Net (loss) income available to common shares $ (163 ) $ (53 ) $ 1,904 $ (1,007 ) Denominator: Weighted-average common shares outstanding (basic) 34,932 34,018 34,728 33,900 Common equivalent shares from common stock options, preferred stock and warrants — — 5,195 — Weighted-average common shares outstanding (diluted) 34,932 34,018 39,923 33,900 Basic net income (loss) per share $ 0.00 $ 0.00 $ 0.05 $ (0.03 ) Diluted net income (loss) per share $ 0.00 $ 0.00 $ 0.05 $ (0.03 )
Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share	The weighted-average anti-dilutive securities, which are excluded from the calculation of diluted earnings per share due to the Company's net income available to common shares position for the periods then ended (including securities that would otherwise be excluded from the calculation of diluted earnings per share due to the Company's stock price), are as follows (in thousands): Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Common stock warrants 20 50 20 50 Series A Convertible Preferred Stock 4,150 4,150 — 4,150 Restricted stock units 967 861 968 853 Options to purchase common stock 1,142 6,125 2,107 5,960 Total 6,279 11,186 3,095 11,013

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Oct. 01, 2016
Commitments and Contingencies Disclosure [Abstract]
Summary of Future Minimum Lease Payments under Non-Cancellable Operating Leases	Minimum lease commitments under non-cancellable operating leases as of October 1, 2016 were as follows (in thousands): 2016 $ 412 2017 1,651 2018 1,671 2019 1,249 2020 542 Thereafter — Total $ 5,525
Summary of Capital Lease Commitments	Capital lease commitments as of October 1, 2016 were as follows (in thousands): 2016 $ 309 2017 1,311 2018 1,319 2019 1,304 2020 1,129 Thereafter 12,910 Total minimum payments required 18,282 Less amount representing interest 7,833 Present value of minimum capital lease payments $ 10,449

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Oct. 01, 2016
Segment Reporting [Abstract]
Summarized Segment Information	Summarized segment information for our continuing operations from the two reportable segments for the periods presented is as follows (in thousands): Base USAP AutoMD Consolidated Thirteen weeks ended October 1, 2016 Net sales $ 73,452 $ 63 $ 73,515 Gross profit $ 22,371 $ 43 $ 22,414 Operating costs (1) $ 21,732 $ 766 $ 22,498 Income (loss) from operations $ 639 $ (723 ) $ (84 ) Capital expenditures $ 1,480 $ 203 $ 1,683 Depreciation and amortization $ 1,611 $ 286 $ 1,897 Total assets, net $ 79,771 $ 3,695 $ 83,466 Thirteen weeks ended October 3, 2015 Net sales $ 70,573 $ 75 $ 70,648 Gross profit $ 20,967 $ 75 $ 21,042 Operating costs (1) $ 20,367 $ 897 $ 21,264 Income (loss) from operations $ 600 $ (822 ) $ (222 ) Capital expenditures $ 1,636 $ 332 $ 1,968 Depreciation and amortization $ 1,539 $ 323 $ 1,862 Total assets, net $ 73,946 $ 6,315 $ 80,261 Thirty-nine weeks ended October 1, 2016 Net sales $ 232,197 $ 179 $ 232,376 Gross profit $ 70,604 $ 156 $ 70,760 Operating costs (1) $ 66,485 $ 2,312 $ 68,797 Income (loss) from operations $ 4,119 $ (2,156 ) $ 1,963 Capital expenditures $ 3,835 $ 735 $ 4,570 Depreciation and amortization $ 4,711 $ 890 $ 5,601 Total assets, net $ 79,771 $ 3,695 $ 83,466 Thirty-nine weeks ended October 3, 2015 Net sales $ 223,309 $ 189 $ 223,498 Gross profit $ 63,199 $ 189 $ 63,388 Operating costs (1) $ 62,322 $ 2,413 $ 64,735 Loss from operations $ 877 $ (2,224 ) $ (1,347 ) Capital expenditures $ 4,974 $ 826 $ 5,800 Depreciation and amortization $ 4,571 $ 1,047 $ 5,618 Total assets, net $ 73,946 $ 6,315 $ 80,261 (1) Operating costs for AutoMD primarily consist of depreciation and amortization on fixed assets and personnel costs. Indirect costs are not allocated to AutoMD. The following table summarizes the approximate distribution of Base USAP revenue by product type. Thirteen Weeks Ended Thirty-Nine Weeks Ended October 1, 2016 October 3, 2015 October 1, 2016 October 3, 2015 Private Label Collision 49% 45% 50% 47% Engine 16% 15% 15% 14% Performance 1% 1% 1% 1% Branded Collision 2% 2% 2% 2% Engine 13% 15% 13% 14% Performance 19% 22% 19% 22% Total 100% 100% 100% 100%

AutoMD (Tables)

AutoMD (Tables)	9 Months Ended
	Oct. 01, 2016
Noncontrolling Interest [Abstract]
Schedule of Changes in Company's Ownership Interests in AutoMD	The table below presents the effect of the Company's ownership interest in AutoMD on the Company's equity during the thirty-nine weeks ended October 1, 2016 : Noncontrolling Interest Balance, January 2, 2016 $ 1,803 Net loss allocable to noncontrolling interest (773 ) Balance, October 1, 2016 $ 1,030

Basis of Presentation and Des22

Basis of Presentation and Description of Company (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016USD ($)	Oct. 03, 2015USD ($)	Oct. 01, 2016USD ($)segment	Oct. 03, 2015USD ($)
Accounting Policies [Abstract]
Net income (loss) | $	$ (102)	$ 8	$ 2,084	$ (827)
Number of reportable segments			2
Number of operating segments			2

Intangible Assets, Net - Summar

Intangible Assets, Net - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,719	$ 4,719
Accumulated Amort. and Impairment	(3,604)	(3,243)
Net Carrying Amount	$ 1,115	1,476
Product design intellectual property
Finite-Lived Intangible Assets [Line Items]
Useful Life	4 years
Gross Carrying Amount	$ 2,750	2,750
Accumulated Amort. and Impairment	(2,556)	(2,361)
Net Carrying Amount	194	389
Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	562	562
Accumulated Amort. and Impairment	(312)	(219)
Net Carrying Amount	$ 250	343
Domain and trade names
Finite-Lived Intangible Assets [Line Items]
Useful Life	10 years
Gross Carrying Amount	$ 1,407	1,407
Accumulated Amort. and Impairment	(736)	(663)
Net Carrying Amount	$ 671	$ 744
Minimum | Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life	3 years
Maximum | Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life	5 years

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense relating to intangibles assets	$ 120	$ 115	$ 361	$ 345

Intangible Assets, Net - Summ25

Intangible Assets, Net - Summary of Future Estimated Annual Amortization Expense (Detail) - USD ($) $ in Thousands	Oct. 01, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,016	$ 121
2,017	344
2,018	185
2,019	100
2,020	100
Thereafter	265
Net Carrying Amount	$ 1,115	$ 1,476

Borrowings - Additional Informa

Borrowings - Additional Information (Detail)	9 Months Ended
	Oct. 01, 2016USD ($)	May 06, 2016USD ($)	May 05, 2016USD ($)	Jan. 02, 2016USD ($)
Line of Credit Facility [Line Items]
Revolving loan payable	$ 0			$ 11,759,000
Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity (up to)	30,000,000
Revolving loan payable	0
Outstanding letters of credit amount	$ 9,283,000
Unused credit commitment fee (percent)	0.25%
Minimum availability required trigger amount (if less than)	$ 3,600,000
Number of days below minimum excess availability that triggers cash dominion period	5 days
Number of consecutive days excess availability is above required amount	60 days
Event of default amount	$ 0
Excess availability (greater than)	3,600,000
Minimum availability required under availability block	$ 2,400,000
Minimum fixed charge ratio if less than minimum excess availability	1
Excess availability under credit facility	$ 13,871,000
Principal payments due	$ 0
One-Month London Interbank Offered Rate (LIBOR) | Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Applicable margin for LIBOR-based interest rate/ Applicable margin for alternate based rate (percent)	1.25%
London Interbank Offered Rate (LIBOR) | Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
LIBOR based interest rate, principal	$ 0
Interest rate (percent)	1.81%
Base Rate | Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Applicable margin for LIBOR-based interest rate/ Applicable margin for alternate based rate (percent)	0.25%
Interest rate (percent)	3.25%
Prime based rate, principal	$ 0
Maximum | Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility exposure		$ 15,000,000	$ 6,000,000

Stockholders' Equity and Shar27

Stockholders' Equity and Share-Based Compensation - Summary of Stock Option Activity for AutoMD (Details) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Oct. 01, 2016USD ($)$ / sharesshares
Shares (in thousands)
Granted (in shares)	980
Expired (in shares)	(80)
Forfeited (in shares)	(44)
AMD Plan
Shares (in thousands)
Options outstanding, beginning balance (in shares)	1,430
Granted (in shares)	10
Exercised (in shares)	0
Expired (in shares)	0
Forfeited (in shares)	(35)
Options outstanding, ending balance (in shares)	1,405
Vested and expected to vest, ending balance (in shares)	1,044
Options exercisable, ending balance (in shares)	463
Weighted Average Exercise Price
Options outstanding, weighted average exercise price, beginning balance (in dollars per share) | $ / shares	$ 1
Granted, weighted average exercise price (in dollars per share) | $ / shares	1
Exercised, weighted average exercise price (in dollars per share) | $ / shares	0
Expired, weighted average exercise price (in dollars per share) | $ / shares	0
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	1
Options outstanding, weighted average exercise price, ending balance (in dollars per share) | $ / shares	1
Vested and expected to vest, weighted average exercise price ending balance (in dollars per share) | $ / shares	1
Options exercisable, weighted average exercise price, ending balance (in dollars per share) | $ / shares	$ 1
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, weighted average remaining contractual term (in years)	8 years 5 months 12 days
Vested and expected to vest, weighted average remaining contractual term (in years)	8 years 5 months 9 days
Options exercisable, weighted average remaining contractual term (in years)	8 years 4 months 2 days
Options outstanding, aggregate intrinsic value | $	$ 0
Vested and expected to vest, aggregate intrinsic value | $	0
Options exercisable, aggregate intrinsic value | $	$ 0

Stockholders' Equity and Shar28

Stockholders' Equity and Share-Based Compensation - Options Narrative (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Oct. 01, 2016	Oct. 01, 2016	Oct. 03, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted (in shares)		980,000
Number of stock options forfeited (in shares)		44,000
Number of stock options expired (in shares)		80,000
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld to satisfy employee tax obligations (in shares)	0	0
Adjustment related employee tax obligations	$ 0	$ 0
Net settlement of stock options (in shares)	0	0
AMD Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted (in dollars per share)		$ 0.55	$ 0.54
Intrinsic value		$ 0	$ 0
Unrecognized share-based compensation expense	$ 278,000	$ 278,000
Number of stock options granted (in shares)		10,000
Number of stock options forfeited (in shares)		35,000
Number of stock options expired (in shares)		0
AMD Plan | Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)	545,000	545,000
Weighted-average period of unrecognized share-based compensation expense		2 years 5 months 9 days

Stockholders' Equity and Shar29

Stockholders' Equity and Share-Based Compensation - Summary of Restricted Stock Unit Activity (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Oct. 01, 2016USD ($)$ / sharesshares
Shares
Awards outstanding, beginning balance (in shares) | shares	804
Awarded (in shares) | shares	954
Released (in shares) | shares	(774)
Forfeited (in shares) | shares	(30)
Awards outstanding, ending balance (in shares) | shares	954
Vested and expected to vest, ending balance (in shares) | shares	865
Weighted Average Exercise Price
Awards outstanding, weighted average exercise price, beginning balance (in dollars per share) | $ / shares	$ 0
Awarded, weighted average exercise price (in dollars per share) | $ / shares	0
Released, weighted average exercise price (in dollars per share) | $ / shares	0
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	0
Awards outstanding, weighted average exercise price, ending balance (in dollars per share) | $ / shares	0
Vested and expected to vest, weighted average exercise price, ending balance (in dollars per share) | $ / shares	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
Awards outstanding, weighted average remaining contractual term (in years)	10 months 13 days
Vested and expected to vest, weighted average remaining contractual term (in years)	10 months 2 days
Awards outstanding, aggregate intrinsic value | $	$ 3,137
Vested and expected to vest, aggregate intrinsic value | $	$ 2,847

Stockholders' Equity and Shar30

Stockholders' Equity and Share-Based Compensation - Restricted Stock Units Narrative (Details) - Restricted Stock Units shares in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 01, 2016USD ($)	Oct. 01, 2016USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld to satisfy employee tax obligations (in shares) | shares		131
Adjustment related employee tax obligations		$ 371
Compensation expense	$ 821	2,537
Unrecognized compensation expense	$ 895	$ 895
Weighted-average period of unrecognized share-based compensation expense		10 months 13 days

Net Income (Loss) Per Share - C

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Numerator:
Net (loss) income attributable to U.S. Auto Parts	$ (102)	$ 8	$ 2,084	$ (827)
Dividends on Series A Convertible Preferred Stock	61	61	180	180
Net (loss) income available to common shares	$ (163)	$ (53)	$ 1,904	$ (1,007)
Denominator:
Weighted-average common shares outstanding (basic) (in shares)	34,932	34,018	34,728	33,900
Common equivalent shares from common stock options and warrants (in shares)	0	0	5,195	0
Weighted-average common shares outstanding (diluted) (in shares)	34,932	34,018	39,923	33,900
Basic and diluted net income (loss) per share (in dollars per share)	$ 0	$ 0	$ 0.05	$ (0.03)
Diluted net income (loss) per share (in dollars per share)	$ 0	$ 0	$ 0.05	$ (0.03)

Net Income (Loss) Per Share - A

Net Income (Loss) Per Share - Anti-Dilutive Securities Excluded from Calculation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	6,279	11,186	3,095	11,013
Common stock warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	20	50	20	50
Series A Convertible Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	4,150	4,150	0	4,150
Restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	967	861	968	853
Options to purchase common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	1,142	6,125	2,107	5,960

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	(1.90%)	41.30%	19.30%	27.00%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Commitments and Contingencies Disclosure [Abstract]
Facility rent expense	$ 437	$ 395	$ 1,241	$ 1,159

Commitments and Contingencies35

Commitments and Contingencies - Summary of Future Minimum Lease Payments under Non-Cancellable Operating Leases (Detail) $ in Thousands	Oct. 01, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,016	$ 412
2,017	1,651
2,018	1,671
2,019	1,249
2,020	542
Thereafter	0
Total	$ 5,525

Commitments and Contingencies36

Commitments and Contingencies - Summary of Capital Lease Commitments (Detail) $ in Thousands	Oct. 01, 2016USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,016	$ 309
2,017	1,311
2,018	1,319
2,019	1,304
2,020	1,129
Thereafter	12,910
Total minimum payments required	18,282
Less amount representing interest	7,833
Present value of minimum capital lease payments	$ 10,449

Segment Information - Additiona

Segment Information - Additional Information (Detail)	9 Months Ended
	Oct. 01, 2016segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Summarize

Segment Information - Summarized Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015	Jan. 02, 2016
Segment Reporting Information [Line Items]
Net sales		$ 73,515	$ 70,648	$ 232,376	$ 223,498
Gross profit		22,414	21,042	70,760	63,388
Operating costs	[1]	22,498	21,264	68,797	64,735
(Loss) income from operations		(84)	(222)	1,963	(1,347)
Capital expenditures		1,683	1,968	4,570	5,800
Depreciation and amortization		1,897	1,862	5,601	5,618
Total assets, net		83,466	80,261	83,466	80,261	$ 83,756
Operating Segments | Base USAP
Segment Reporting Information [Line Items]
Net sales		73,452	70,573	232,197	223,309
Gross profit		22,371	20,967	70,604	63,199
Operating costs	[1]	21,732	20,367	66,485	62,322
(Loss) income from operations		639	600	4,119	877
Capital expenditures		1,480	1,636	3,835	4,974
Depreciation and amortization		1,611	1,539	4,711	4,571
Total assets, net		79,771	73,946	79,771	73,946
Operating Segments | AutoMD
Segment Reporting Information [Line Items]
Net sales		63	75	179	189
Gross profit		43	75	156	189
Operating costs	[1]	766	897	2,312	2,413
(Loss) income from operations		(723)	(822)	(2,156)	(2,224)
Capital expenditures		203	332	735	826
Depreciation and amortization		286	323	890	1,047
Total assets, net		$ 3,695	$ 6,315	$ 3,695	$ 6,315
[1]	Operating costs for AutoMD primarily consist of depreciation and amortization on fixed assets and personnel costs. Indirect costs are not allocated to AutoMD.

Segment Information - Summary o

Segment Information - Summary of Segment Percentages (Details) - Sales Revenue, Product Line - Product Concentration Risk - Base USAP	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Segment Reporting Information [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Private Label, Collision
Segment Reporting Information [Line Items]
Concentration risk percentage	49.00%	45.00%	50.00%	47.00%
Private Label, Engine
Segment Reporting Information [Line Items]
Concentration risk percentage	16.00%	15.00%	15.00%	14.00%
Private Label, Performance
Segment Reporting Information [Line Items]
Concentration risk percentage	1.00%	1.00%	1.00%	1.00%
Branded, Collision
Segment Reporting Information [Line Items]
Concentration risk percentage	2.00%	2.00%	2.00%	2.00%
Branded, Engine
Segment Reporting Information [Line Items]
Concentration risk percentage	13.00%	15.00%	13.00%	14.00%
Branded, Performance
Segment Reporting Information [Line Items]
Concentration risk percentage	19.00%	22.00%	19.00%	22.00%

AutoMD (Details)

AutoMD (Details) - AutoMD $ / shares in Units, $ in Thousands	Oct. 08, 2014USD ($)board_member$ / sharesshares	Oct. 19, 2016$ / sharesshares
Common Stock Purchase Agreement
Noncontrolling Interest [Line Items]
Number of subsidiary shares issued (in shares) | shares	7,000,000
Purchase price of shares issued (in dollars per share) | $ / shares	$ 1
Percentage ownership after issuance of shares	64.10%
Issuance of shares | $	$ 2,534
Increase in Company's interest | $	(3,847)
Deferred tax liability as a result of transaction | $	$ 1,313
Investor Rights Agreement
Noncontrolling Interest [Line Items]
Share price (in dollars per share) | $ / shares	$ 1
Minimum ownership percentage required by the Company in agreement (less than)	50.00%
Number of days written notice in event of default of agreement terms (not less than)	30 days
Annual interest rate in event of default of agreement terms	10.00%
Board Member | Common Stock Purchase Agreement
Noncontrolling Interest [Line Items]
Number of board members affiliated with the transaction | board_member	2
Subsequent Event | Common Stock Purchase Agreement
Noncontrolling Interest [Line Items]
Share price (in dollars per share) | $ / shares		$ 1
Shares repurchased (in shares) | shares		2,000
Ownership interest of subsidiary		67.40%

AutoMD - Schedule of Changes in

AutoMD - Schedule of Changes in Company's Ownership Interests in AutoMD (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance			$ 1,803
Net loss allocable to noncontrolling interest	$ (258)	$ (296)	(773)	$ (799)
Ending balance	$ 1,030		$ 1,030