CarParts.com (PRTS) 10-Q 10 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Apr. 02, 2016	May. 06, 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	Apr. 2, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Trading Symbol	PRTS
Amendment Flag	false
Entity Common Stock, Shares Outstanding		34,677,434

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Current assets:
Cash and cash equivalents	$ 4,542	$ 5,537
Short-term investments	65	65
Accounts receivable, net of allowances of $34 and $17 at April 2, 2016 and January 2, 2016, respectively	3,461	3,236
Inventory	46,937	51,216
Other current assets	3,109	2,475
Total current assets	58,114	62,529
Property and equipment, net	18,138	18,431
Intangible assets, net	1,356	1,476
Other non-current assets	1,253	1,320
Total assets	78,861	83,756
Current liabilities:
Accounts payable	27,635	25,523
Accrued expenses	7,679	7,267
Revolving loan payable	3,000	11,759
Current portion of capital leases payable	530	521
Other current liabilities	4,456	3,854
Total current liabilities	43,300	48,924
Capital leases payable, net of current portion	10,128	10,168
Deferred income taxes	766	944
Other non-current liabilities	1,566	1,577
Total liabilities	$ 55,760	$ 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 April 2, 2016 and January 2, 2016	$ 4	$ 4
Common stock, $0.001 par value; 100,000 shares authorized; 34,675 and 34,137 shares issued and outstanding at April 2, 2016 and January 2, 2016	35	34
Additional paid-in capital	176,919	176,873
Accumulated other comprehensive income	421	440
Accumulated deficit	(155,819)	(157,011)
Total stockholders’ equity	21,560	20,340
Noncontrolling interest	1,541	1,803
Total equity	23,101	22,143
Total liabilities and stockholders’ equity	$ 78,861	$ 83,756

Consolidated Balance Sheets (U3

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Apr. 02, 2016	Jan. 02, 2016
Accounts receivable, allowances	$ 34,000	$ 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)	34,675,000	34,137,000
Common stock, shares outstanding (in shares)	34,675,000	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
		Apr. 02, 2016	Apr. 04, 2015
Income Statement [Abstract]
Net sales		$ 80,806	$ 76,388
Cost of sales	[1]	56,214	54,910
Gross profit		24,592	21,478
Operating expenses:
Marketing		11,490	10,852
General and administrative		4,485	4,181
Fulfillment		6,038	5,060
Technology		1,277	1,288
Amortization of intangible assets		120	115
Total operating expenses	[2]	23,410	21,496
Income (loss) from operations		1,182	(18)
Other income (expense):
Other income, net		6	23
Interest expense		(347)	(373)
Total other expense, net		(341)	(350)
Income (loss) before income taxes		841	(368)
Income tax provision (benefit)		(149)	(52)
Net income (loss) including noncontrolling interests		990	(316)
Net loss attributable to noncontrolling interests		(262)	(256)
Net income (loss) attributable to U.S. Auto Parts		1,252	(60)
Other comprehensive loss attributable to U.S. Auto Parts:
Foreign currency translation adjustments		(5)	(10)
Total other comprehensive loss attributable to U.S. Auto Parts		(5)	(10)
Comprehensive income (loss) attributable to U.S. Auto Parts		$ 1,247	$ (70)
Basic and diluted net income (loss) per share (in dollars per share)		$ 0.03	$ 0
Diluted net income (loss) per share (in dollars per share)		$ 0.03	$ 0
Shares used in computation of basic net income (loss) per share (in shares)		34,497	33,720
Shares used in computation of diluted net income (loss) per share (in shares)		39,359	33,720
[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	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Operating activities
Net income (loss) including noncontrolling interests	$ 990	$ (316)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization expense	1,851	1,934
Amortization of intangible assets	120	115
Deferred income taxes	(178)	(67)
Share-based compensation expense	802	510
Stock awards issued for non-employee director service	2	0
Amortization of deferred financing costs	20	20
Gain from disposition of assets	0	(13)
Changes in operating assets and liabilities:
Accounts receivable	(225)	(405)
Inventory	4,279	15
Other current assets	(630)	(506)
Other non-current assets	49	(7)
Accounts payable and accrued expenses	2,492	2,497
Other current liabilities	601	904
Other non-current liabilities	78	(131)
Net cash provided by operating activities	10,251	4,550
Investing activities
Additions to property and equipment	(1,276)	(2,151)
Proceeds from sale of property and equipment	0	13
Cash paid for intangible assets	(125)	(110)
Net cash used in investing activities	(1,401)	(2,248)
Financing activities
Borrowings from revolving loan payable	5,939	4,314
Payments made on revolving loan payable	(14,698)	(5,850)
Proceeds from stock options	127	13
Payments on capital leases	(141)	(66)
Statutory tax withholding payment for share-based compensation	(970)	(438)
Payment of liabilities related to financing activities	(100)	0
Net cash used in financing activities	(9,843)	(2,027)
Effect of exchange rate changes on cash	(2)	(11)
Net change in cash and cash equivalents	(995)	264
Cash and cash equivalents, beginning of period	5,537	7,653
Cash and cash equivalents, end of period	4,542	7,917
Supplemental disclosure of non-cash investing and financing activities:
Accrued asset purchases	849	700
Property acquired under capital lease	111	0
Accrued intangible asset	0	15
Supplemental disclosure of cash flow information:
Cash (paid) received during the period for income taxes	(7)	7
Cash paid during the period for interest	$ 315	$ 303

Basis of Presentation and Descr

Basis of Presentation and Description of Company	3 Months Ended
	Apr. 02, 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 segment, 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 April 2, 2016 and the consolidated results of operations and cash flows for the thirteen weeks ended April 2, 2016 and April 4, 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 weeks ended April 2, 2016 , the Company had a net income of $1,252 compared to a net loss of $60 during the thirteen weeks ended April 4, 2015 . 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	3 Months Ended
	Apr. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets, Net	Intangible Assets, Net Intangible assets consisted of the following at April 2, 2016 and January 2, 2016 (in thousands): April 2, 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 $ (2,426 ) $ 324 $ 2,750 $ (2,361 ) $ 389 Patent license agreements 3 - 5 years 562 (250 ) $ 312 562 (219 ) $ 343 Domain and trade names 10 years 1,407 (687 ) $ 720 1,407 (663 ) $ 744 Total $ 4,719 $ (3,363 ) $ 1,356 $ 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 April 2, 2016 and April 4, 2015 was $120 and $115 , respectively. The following table summarizes the future estimated annual amortization expense for these assets over the next five years: 2016 $ 361 2017 344 2018 185 2019 100 2020 100 Thereafter 266 Total $ 1,356

Borrowings

Borrowings	3 Months Ended
	Apr. 02, 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 April 2, 2016 , our outstanding revolving loan balance was $3,000 . 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 . 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 1.50% , 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 April 2, 2016 , the Company’s LIBOR based interest rate was 1.94% (on $3,000 principal) and the Company’s prime based rate was 3.50% (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 $20,074 at April 2, 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	3 Months Ended
	Apr. 02, 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 thirteen weeks ended April 2, 2016 , and details regarding the options outstanding and exercisable at April 2, 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, April 2, 2016 1,405 $1.00 8.95 $ — Vested and expected to vest at April 2, 2016 1,044 $1.00 8.94 $ — Options exercisable, April 2, 2016 345 $1.00 8.80 $ — At April 2, 2016 , 545 shares were available for future grants under the AMD Plan. The weighted-average fair value of options granted and outstanding as of April 2, 2016 and April 4, 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 thirteen weeks ended April 2, 2016 and April 4, 2015 , the options had $0 intrinsic value. The Company had $419 of unrecognized share-based compensation expense related to stock options outstanding as of April 2, 2016 , which expense is expected to be recognized over a weighted-average period of 2.94 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 weeks ended April 2, 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 thirteen weeks ended April 2, 2016 : • Granted options to purchase 680 common shares. • Forfeitures of 4 options to purchase common shares. • Expiration of 10 options to purchase common shares. The following table summarizes the Company’s restricted stock unit ("RSU") activity for the thirteen weeks ended April 2, 2016 , and details regarding the awards outstanding and exercisable at April 2, 2016 (in thousands): Shares Weighted Weighted Average Aggregate Awards outstanding, January 2, 2016 804 $ — Awarded 954 $ — Vested (774 ) $ — Forfeited — $ — Awards outstanding, April 2, 2016 984 $ — 1.25 $ 2,666 Vested and expected to vest at April 2, 2016 854 $ — 1.21 $ 2,313 During the thirteen weeks ended April 2, 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 thirteen weeks ended April 2, 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 weeks ended April 2, 2016 , we recorded compensation expense of $ 827 . As of April 2, 2016 , there was unrecognized compensation expense of $1,806 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 1.25 years .

Net Income (Loss) Per Share

Net Income (Loss) Per Share	3 Months Ended
	Apr. 02, 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 April 2, 2016 April 4, 2015 Net income (loss) per share: Numerator: Net income (loss) attributable to U.S. Auto Parts $ 1,252 $ (60 ) Dividends on Series A Convertible Preferred Stock 60 60 Net income (loss) available to common shares $ 1,192 $ (120 ) Denominator: Weighted-average common shares outstanding (basic) 34,497 33,720 Common equivalent shares from common stock options, preferred stock and warrants 4,862 — Weighted-average common shares outstanding (diluted) 39,359 33,720 Basic and diluted net income (loss) per share $ 0.03 $ — Diluted net income (loss) per share $ 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 April 2, 2016 April 4, 2015 Common stock warrants 20 50 Series A Convertible Preferred Stock — 4,150 Restricted stock units 957 905 Options to purchase common stock 3,692 5,712 Total 4,669 10,817

Income Taxes

Income Taxes	3 Months Ended
	Apr. 02, 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 2011-2015 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 2012-2015 remain open. For the thirteen weeks ended April 2, 2016 the effective tax rate for the Company was (17.7)% . The Company's effective tax rate for the thirteen weeks ended April 2, 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 weeks ended April 4, 2015 , the effective tax rate for the Company was 14.1% . The Company’s effective tax rate for the thirteen weeks ended April 4, 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	3 Months Ended
	Apr. 02, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Facilities Leases The Company’s corporate headquarters is located in Carson, California. The Company’s corporate headquarters has an initial lease term of five years through October 2016, and optional renewals through January 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 weeks ended April 2, 2016 was $402 compared to $365 for the thirteen weeks ended April 4, 2015 . Minimum lease commitments under non-cancellable operating leases as of April 2, 2016 were as follows (in thousands): 2016 $ 1,138 2017 1,230 2018 1,267 2019 845 2020 200 2021 onwards $ — Total $ 4,680 Capital lease commitments as of April 2, 2016 were as follows (in thousands): 2016 $ 977 2017 1,276 2018 1,284 2019 1,298 2020 1,130 2021 onwards 12,912 Total minimum payments required 18,877 Less amount representing interest 8,219 Present value of minimum capital lease payments $ 10,658 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	3 Months Ended
	Apr. 02, 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 April 2, 2016 Net sales $ 80,746 $ 60 $ 80,806 Gross profit $ 24,532 $ 60 $ 24,592 Operating costs (1) $ 22,621 $ 789 $ 23,410 Income (loss) from operations $ 1,911 $ (729 ) $ 1,182 Capital expenditures $ 1,005 $ 271 $ 1,276 Depreciation and amortization $ 1,544 $ 307 $ 1,851 Total assets, net $ 73,988 $ 4,873 $ 78,861 Thirteen weeks ended April 4, 2015 Net sales $ 76,325 $ 63 $ 76,388 Gross profit $ 21,415 $ 63 $ 21,478 Operating costs (1) $ 20,720 $ 776 $ 21,496 Income (loss) from operations $ 695 $ (713 ) $ (18 ) Capital expenditures $ 1,966 $ 185 $ 2,151 Depreciation and amortization $ 1,549 $ 385 $ 1,934 Total assets, net $ 76,172 $ 7,667 $ 83,839 (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 April 2, 2016 April 4, 2015 Private Label Collision 52% 50% Engine 14% 13% Performance 1% 1% Branded Collision 2% 2% Engine 12% 13% Performance 19% 21% Total 100% 100%

AutoMD

AutoMD	3 Months Ended
	Apr. 02, 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 . Additionally, pursuant to the terms of the Purchase Agreement, the Company may be required to purchase 2,000 shares of AutoMD common stock at a purchase price of $1.00 per share, with such purchase to be triggered only if as of October 8, 2016, AutoMD does not meet a required minimum number of approved auto repair shops permitted to submit a quotation on AutoMD’s website ("Registered Repair Shops"), or separately if at any time during the two years following the closing date AutoMD fails to meet specified minimum cash balances and minimum numbers of Registered Repair Shops. The Purchase Agreement also limits the use of the $7,000 in 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. The table below presents the effect of changes in the Company's ownership interest in AutoMD on the Company's equity during the thirteen weeks ended April 2, 2016 : Noncontrolling Interest Balance, January 2, 2016 $ 1,803 Net loss allocable to noncontrolling interest (262 ) Balance, April 2, 2016 $ 1,541

Basis of Presentation and Des15

Basis of Presentation and Description of Company (Policies)	3 Months Ended
	Apr. 02, 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 April 2, 2016 and the consolidated results of operations and cash flows for the thirteen weeks ended April 2, 2016 and April 4, 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)	3 Months Ended
	Apr. 02, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets	Intangible assets consisted of the following at April 2, 2016 and January 2, 2016 (in thousands): April 2, 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 $ (2,426 ) $ 324 $ 2,750 $ (2,361 ) $ 389 Patent license agreements 3 - 5 years 562 (250 ) $ 312 562 (219 ) $ 343 Domain and trade names 10 years 1,407 (687 ) $ 720 1,407 (663 ) $ 744 Total $ 4,719 $ (3,363 ) $ 1,356 $ 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 over the next five years: 2016 $ 361 2017 344 2018 185 2019 100 2020 100 Thereafter 266 Total $ 1,356

Stockholders' Equity and Shar17

Stockholders' Equity and Share-Based Compensation (Tables)	3 Months Ended
	Apr. 02, 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 thirteen weeks ended April 2, 2016 , and details regarding the options outstanding and exercisable at April 2, 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, April 2, 2016 1,405 $1.00 8.95 $ — Vested and expected to vest at April 2, 2016 1,044 $1.00 8.94 $ — Options exercisable, April 2, 2016 345 $1.00 8.80 $ —
Summary of Restricted Stock Unit Activity	The following table summarizes the Company’s restricted stock unit ("RSU") activity for the thirteen weeks ended April 2, 2016 , and details regarding the awards outstanding and exercisable at April 2, 2016 (in thousands): Shares Weighted Weighted Average Aggregate Awards outstanding, January 2, 2016 804 $ — Awarded 954 $ — Vested (774 ) $ — Forfeited — $ — Awards outstanding, April 2, 2016 984 $ — 1.25 $ 2,666 Vested and expected to vest at April 2, 2016 854 $ — 1.21 $ 2,313

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	3 Months Ended
	Apr. 02, 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 April 2, 2016 April 4, 2015 Net income (loss) per share: Numerator: Net income (loss) attributable to U.S. Auto Parts $ 1,252 $ (60 ) Dividends on Series A Convertible Preferred Stock 60 60 Net income (loss) available to common shares $ 1,192 $ (120 ) Denominator: Weighted-average common shares outstanding (basic) 34,497 33,720 Common equivalent shares from common stock options, preferred stock and warrants 4,862 — Weighted-average common shares outstanding (diluted) 39,359 33,720 Basic and diluted net income (loss) per share $ 0.03 $ — Diluted net income (loss) per share $ 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 April 2, 2016 April 4, 2015 Common stock warrants 20 50 Series A Convertible Preferred Stock — 4,150 Restricted stock units 957 905 Options to purchase common stock 3,692 5,712 Total 4,669 10,817

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Apr. 02, 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 April 2, 2016 were as follows (in thousands): 2016 $ 1,138 2017 1,230 2018 1,267 2019 845 2020 200 2021 onwards $ — Total $ 4,680
Summary of Capital Lease Commitments	Capital lease commitments as of April 2, 2016 were as follows (in thousands): 2016 $ 977 2017 1,276 2018 1,284 2019 1,298 2020 1,130 2021 onwards 12,912 Total minimum payments required 18,877 Less amount representing interest 8,219 Present value of minimum capital lease payments $ 10,658

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Apr. 02, 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 April 2, 2016 Net sales $ 80,746 $ 60 $ 80,806 Gross profit $ 24,532 $ 60 $ 24,592 Operating costs (1) $ 22,621 $ 789 $ 23,410 Income (loss) from operations $ 1,911 $ (729 ) $ 1,182 Capital expenditures $ 1,005 $ 271 $ 1,276 Depreciation and amortization $ 1,544 $ 307 $ 1,851 Total assets, net $ 73,988 $ 4,873 $ 78,861 Thirteen weeks ended April 4, 2015 Net sales $ 76,325 $ 63 $ 76,388 Gross profit $ 21,415 $ 63 $ 21,478 Operating costs (1) $ 20,720 $ 776 $ 21,496 Income (loss) from operations $ 695 $ (713 ) $ (18 ) Capital expenditures $ 1,966 $ 185 $ 2,151 Depreciation and amortization $ 1,549 $ 385 $ 1,934 Total assets, net $ 76,172 $ 7,667 $ 83,839 (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 April 2, 2016 April 4, 2015 Private Label Collision 52% 50% Engine 14% 13% Performance 1% 1% Branded Collision 2% 2% Engine 12% 13% Performance 19% 21% Total 100% 100%

AutoMD (Tables)

AutoMD (Tables)	3 Months Ended
	Apr. 02, 2016
Noncontrolling Interest [Abstract]
Schedule of Changes in Company's Ownership Interests in AutoMD	The table below presents the effect of changes in the Company's ownership interest in AutoMD on the Company's equity during the thirteen weeks ended April 2, 2016 : Noncontrolling Interest Balance, January 2, 2016 $ 1,803 Net loss allocable to noncontrolling interest (262 ) Balance, April 2, 2016 $ 1,541

Basis of Presentation and Des22

Basis of Presentation and Description of Company (Details) $ in Thousands	3 Months Ended
	Apr. 02, 2016USD ($)segment	Apr. 04, 2015USD ($)
Accounting Policies [Abstract]
Net income (loss) | $	$ 1,252	$ (60)
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	3 Months Ended
	Apr. 02, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,719	$ 4,719
Accumulated Amort. and Impairment	(3,363)	(3,243)
Net Carrying Amount	$ 1,356	1,476
Product design intellectual property
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	4 years
Gross Carrying Amount	$ 2,750	2,750
Accumulated Amort. and Impairment	(2,426)	(2,361)
Net Carrying Amount	324	389
Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	562	562
Accumulated Amort. and Impairment	(250)	(219)
Net Carrying Amount	$ 312	343
Domain and trade names
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	10 years
Gross Carrying Amount	$ 1,407	1,407
Accumulated Amort. and Impairment	(687)	(663)
Net Carrying Amount	$ 720	$ 744
Minimum | Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	3 years
Maximum | Patent license agreements
Finite-Lived Intangible Assets [Line Items]
Useful Life (years)	5 years

Intangible Assets, Net - Additi

Intangible Assets, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense relating to intangibles assets	$ 120	$ 115

Intangible Assets, Net - Summ25

Intangible Assets, Net - Summary of Future Estimated Annual Amortization Expense (Detail) - USD ($) $ in Thousands	Apr. 02, 2016	Jan. 02, 2016
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2,016	$ 361
2,017	344
2,018	185
2,019	100
2,020	100
Thereafter	266
Net Carrying Amount	$ 1,356	$ 1,476

Borrowings - Additional Informa

Borrowings - Additional Information (Detail)	Apr. 02, 2016USD ($)	Apr. 02, 2016USD ($)	May. 06, 2016USD ($)	May. 05, 2016USD ($)	Jan. 02, 2016USD ($)
Line of Credit Facility [Line Items]
Revolving loan payable	$ 3,000,000	$ 3,000,000			$ 11,759,000
Revolving Credit Facility
Line of Credit Facility [Line Items]
Event of default amount	0	0
Principal payments due	0	0
Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity (up to)	30,000,000	30,000,000
Revolving loan payable	$ 3,000,000	$ 3,000,000
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
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	1
Excess availability under credit facility	$ 20,074,000	$ 20,074,000
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)		1.50%
London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Line of Credit Facility [Line Items]
Interest rate (percent)	1.94%	1.94%
LIBOR based interest rate, principal	$ 3,000,000
Base Rate | Revolving Credit Facility
Line of Credit Facility [Line Items]
Interest rate (percent)	3.50%	3.50%
Prime based rate, principal	$ 0
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%
Subsequent Event | Maximum | Jp Morgan Chase Bank | Revolving Credit Facility
Line of Credit Facility [Line Items]
Line of credit facility exposure			$ 15,000	$ 6,000

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	3 Months Ended
	Apr. 02, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Granted (in shares)	680
Expired (in shares)	(10)
Forfeited (in shares)	(4)
AMD Plan
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
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)	345
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
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 11 months 12 days
Vested and expected to vest, weighted average remaining contractual term (in years)	8 years 11 months 9 days
Options exercisable, weighted average remaining contractual term (in years)	8 years 9 months 18 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 - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock options granted (in shares)	680
Number of stock options forfeited (in shares)	4
Number of stock options expired (in shares)	10
Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld to satisfy employee tax obligations	0
Adjustment related employee tax obligations	$ 0
Net settlement of stock options (in shares)	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	$ 419,000
Number of stock options granted (in shares)	10
Number of stock options forfeited (in shares)	35
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	545
Weighted-average period of unrecognized share-based compensation expense	2 years 11 months 9 days

Stockholders' Equity and Shar29

Stockholders' Equity and Share-Based Compensation - Summary of Restricted Stock Option Activity (Details) - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Awards outstanding, beginning balance (in shares) | shares	804
Awarded (in shares) | shares	954
Released (in shares) | shares	(774)
Forfeited (in shares) | shares	0
Awards outstanding, ending balance (in shares) | shares	984
Vested and expected to vest, ending balance (in shares) | shares	854
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
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)	1 year 3 months
Vested and expected to vest, weighted average remaining contractual term (in years)	1 year 2 months 16 days
Awards outstanding, aggregate intrinsic value | $	$ 2,666
Vested and expected to vest, aggregate intrinsic value | $	$ 2,313

Stockholders' Equity and Shar30

Stockholders' Equity and Share-Based Compensation - Restricted Stock Units (Details) - Restricted Stock Units shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 02, 2016USD ($)shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares withheld to satisfy employee tax obligations | shares	131
Adjustment related employee tax obligations	$ 371
Compensation expense	827
Unrecognized compensation expense	$ 1,806
Weighted-average period of unrecognized share-based compensation expense	1 year 3 months

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
	Apr. 02, 2016	Apr. 04, 2015
Numerator:
Net income (loss) attributable to U.S. Auto Parts	$ 1,252	$ (60)
Dividends on Series A Convertible Preferred Stock	60	60
Net income (loss) available to common shares	$ 1,192	$ (120)
Denominator:
Weighted-average common shares outstanding (basic) (in shares)	34,497	33,720
Common equivalent shares from common stock options and warrants (in shares)	4,862	0
Weighted-average common shares outstanding (diluted) (in shares)	39,359	33,720
Basic and diluted net income (loss) per share (in dollars per share)	$ 0.03	$ 0
Diluted net income (loss) per share (in dollars per share)	$ 0.03	$ 0

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
	Apr. 02, 2016	Apr. 04, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted earnings per share	4,669	10,817
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
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	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	957	905
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	3,692	5,712

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail)	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Income Tax Disclosure [Abstract]
Effective tax rate	(17.70%)	14.10%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Commitments and Contingencies Disclosure [Abstract]
Initial lease term	5 years
Facility rent expense	$ 402	$ 365

Commitments and Contingencies35

Commitments and Contingencies - Summary of Future Minimum Lease Payments under Non-Cancellable Operating Leases (Detail) $ in Thousands	Apr. 02, 2016USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,016	$ 1,138
2,017	1,230
2,018	1,267
2,019	845
2,020	200
2021 onwards	0
Total	$ 4,680

Commitments and Contingencies36

Commitments and Contingencies - Summary of Capital Lease Commitments (Detail) $ in Thousands	Apr. 02, 2016USD ($)
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2,016	$ 977
2,017	1,276
2,018	1,284
2,019	1,298
2,020	1,130
2021 onwards	12,912
Total minimum payments required	18,877
Less amount representing interest	8,219
Present value of minimum capital lease payments	$ 10,658

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Apr. 02, 2016segment
Segment Reporting [Abstract]
Number of reportable segments	2

Segment Information - Summarize

Segment Information - Summarized Segment Information (Detail) - USD ($) $ in Thousands		3 Months Ended
		Apr. 02, 2016	Apr. 04, 2015	Jan. 02, 2016
Segment Reporting Information [Line Items]
Net sales		$ 80,806	$ 76,388
Gross profit		24,592	21,478
Operating costs	[1]	23,410	21,496
Income (loss) from operations		1,182	(18)
Capital expenditures		1,276	2,151
Depreciation and amortization		1,851	1,934
Total assets, net		78,861	83,839	$ 83,756
Operating Segments | Base USAP
Segment Reporting Information [Line Items]
Net sales		80,746	76,325
Gross profit		24,532	21,415
Operating costs	[1]	22,621	20,720
Income (loss) from operations		1,911	695
Capital expenditures		1,005	1,966
Depreciation and amortization		1,544	1,549
Total assets, net		73,988	76,172
Operating Segments | AutoMD
Segment Reporting Information [Line Items]
Net sales		60	63
Gross profit		60	63
Operating costs	[1]	789	776
Income (loss) from operations		(729)	(713)
Capital expenditures		271	185
Depreciation and amortization		307	385
Total assets, net		$ 4,873	$ 7,667
[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 - Operating Segments - Base USAP	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Segment Reporting Information [Line Items]
Concentration risk percentage	100.00%	100.00%
Private Label, Collision
Segment Reporting Information [Line Items]
Concentration risk percentage	52.00%	50.00%
Private Label, Engine
Segment Reporting Information [Line Items]
Concentration risk percentage	14.00%	13.00%
Private Label, Performance
Segment Reporting Information [Line Items]
Concentration risk percentage	1.00%	1.00%
Branded, Collision
Segment Reporting Information [Line Items]
Concentration risk percentage	2.00%	2.00%
Branded, Engine
Segment Reporting Information [Line Items]
Concentration risk percentage	12.00%	13.00%
Branded, Performance
Segment Reporting Information [Line Items]
Concentration risk percentage	19.00%	21.00%

AutoMD (Details)

AutoMD (Details) - AutoMD $ / shares in Units, $ in Thousands	Oct. 08, 2014USD ($)board_member$ / sharesshares
Common Stock Purchase Agreement
Noncontrolling Interest [Line Items]
Number of subsidiary shares issued | 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
Number of shares the Company may be required to purchase | shares	2,000,000
Share price (in dollars per share) | $ / shares	$ 1
Period following closing date the Company is subject to stock repurchase (years)	2 years
Proceeds from sale of equity in subsidiary	$ 7,000
Investor Rights Agreement
Noncontrolling Interest [Line Items]
Share price (in dollars per share) | $ / shares	$ 1
Minimum ownership percentage required by the Company in agreement	50.00%
Number of days written notice in event of default of agreement terms	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

AutoMD - Schedule of Changes in

AutoMD - Schedule of Changes in Company's Ownership Interests in AutoMD (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 1,803
Net loss allocable to noncontrolling interest	(262)	$ (256)
Ending balance	$ 1,541