Power Solutions International (PSIX) 10-Q 8 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	5-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	PSIX
Entity Registrant Name	Power Solutions International, Inc.
Entity Central Index Key	1137091
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		10,736,655

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets
Cash	$10,235	$6,561
Accounts receivable, net	75,326	81,740
Inventories, net	118,058	93,903
Prepaid expenses and other current assets	4,071	4,801
Deferred income taxes	3,998	3,998
Total current assets	211,688	191,003
Property, plant & equipment, net	22,258	20,892
Intangible assets, net	20,552	21,392
Goodwill	23,546	23,546
Other noncurrent assets	8,784	5,804
TOTAL ASSETS	286,828	262,637
Current liabilities
Accounts payable	57,058	60,877
Income taxes payable	1,591	779
Accrued compensation and benefits	4,640	5,983
Current maturities of long-term debt	1,667	1,667
Other accrued liabilities	8,653	6,742
Total current liabilities	73,609	76,048
LONG-TERM OBLIGATIONS
Revolving line of credit	102,393	78,030
Deferred income taxes	3,241	3,241
Private placement warrants	14,650	11,036
Long-term debt, less current maturities	1,944	2,361
Other noncurrent liabilities	1,343	1,122
TOTAL LIABILITIES	197,180	171,838
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY
Series A convertible preferred stock - $0.001 par value. Authorized: 114,000 shares. Issued and outstanding: -0- shares at March 31, 2015 and December 31, 2014.
Common stock - $0.001 par value. Authorized: 50,000,000 shares. Issued: 11,562,209 shares at March 31, 2015 and December 31, 2014. Outstanding: 10,731,284 at March 31, 2015 and December 31, 2014.	12	12
Additional paid-in-capital	74,264	73,959
Retained earnings	19,622	21,078
Treasury stock, at cost, 830,925 shares at March 31, 2015 and December 31, 2014.	-4,250	-4,250
TOTAL STOCKHOLDERS' EQUITY	89,648	90,799
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$286,828	$262,637

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Series A convertible preferred stock, par value	$0.00	$0.00
Series A convertible preferred stock, shares authorized	114,000	114,000
Series A convertible preferred stock, shares issued	0	0
Series A convertible preferred stock, shares outstanding	0	0
Common stock, par value	$0.00	$0.00
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares issued	11,562,209	11,562,209
Common stock, shares outstanding	10,731,284	10,731,284
Treasury stock, at cost	830,925	830,925

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Net sales	$86,139	$66,735
Cost of sales	69,682	54,805
Gross profit	16,457	11,930
Operating expenses:
Research & development and engineering	5,168	3,598
Selling and service	2,750	1,827
General and administrative	4,469	2,984
Total operating expenses	12,387	8,409
Operating income	4,070	3,521
Other (income) expense:
Interest expense	489	99
Private placement warrant expense (income)	3,614	-233
Other expense, net	39	23
Total other expense (income)	4,142	-111
(Loss) income before income taxes	-72	3,632
Income tax provision	1,384	1,258
Net (loss) income	($1,456)	$2,374
Common Shares [Member]
Weighted-average common shares outstanding:
Basic	10,797,056	10,542,460
Diluted	10,797,056	11,054,594
(Loss) earnings per share-basic common share	($0.13)	$0.23
(Loss) earnings per share-diluted common share	($0.13)	$0.19

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net (loss) income	($1,456)	$2,374
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	833	478
Amortization	850	10
Non-cash interest expense	25	14
Share-based compensation expense	305	321
Increase (decrease) in accounts receivable allowances	163	-8
Increase in inventory reserves	225	183
Increase (decrease) in valuation of private placement warrant liability	3,614	-233
Loss on investment in joint venture	47	33
Loss on disposal of assets	18
(Increase) decrease in operating assets, net of effects of business acquisition:
Accounts receivable	6,251	-6,170
Inventories	-18,059	-12,945
Prepaid expenses and other assets	672	580
Increase (decrease) in operating liabilities, net of effects of business acquisition:
Accounts payable	-4,820	7,220
Accrued compensation and benefits and other accrued liabilities	568	-2,530
Income taxes payable	812	418
Other noncurrent liabilities	221	-367
Net cash used in operating activities	-9,731	-10,622
Cash flows from investing activities
Purchases of property, plant and equipment	-806	-784
Acquisitions	-9,735
Net cash used in investing activities	-10,541	-784
Cash flows from financing activities
Advances from revolving line of credit - noncurrent obligation	32,363	14,126
Repayments of revolving line of credit - noncurrent obligation	-8,000	-5,900
Proceeds from exercise of private placement warrants		523
Payments on long-term debt	-417
Net cash provided by financing activities	23,946	8,749
Increase (decrease) in cash	3,674	-2,657
Cash at beginning of period	6,561	6,306
Cash at end of period	10,235	3,649
Supplemental disclosures of cash flow information
Cash paid for interest	435	86
Cash paid for income taxes	608
Supplemental disclosure of non-cash transactions
Unpaid property, plant, equipment and other assets	1,001	854
Fair value of private placement warrants exercised		$2,226

Description_of_the_company_and

Description of the company and business operations	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Description of the company and business operations	1. Description of the company and business operations
	Description of the company
	Power Solutions International, Inc., a Delaware corporation (“Company”), is the successor in a migratory merger (“Migratory Merger”) effective August 26, 2011, to Power Solutions International, Inc., a Nevada corporation. “Power Solutions International” and “PSI” refer to Power Solutions International, Inc., a Nevada corporation, prior to the consummation of the Migratory Merger, and Power Solutions International, Inc., a Delaware corporation, following the consummation of the Migratory Merger.
	Power Solutions International, Inc., a Nevada corporation, was formerly known as Format, Inc. (“Format”), and prior to the consummation of a reverse recapitalization, was engaged, to a limited extent, in EDGARizing corporate documents for filing with the Securities and Exchange Commission (“SEC”) and in providing limited commercial printing services. On April 29, 2011, Format consummated a reverse acquisition transaction with The W Group, Inc. and its subsidiaries (“The W Group”) (“Reverse Recapitalization”), and in connection with this transaction, Format changed its corporate name to Power Solutions International, Inc. The W Group was considered the accounting acquirer and remained as the surviving corporation of the reverse acquisition, becoming a wholly-owned subsidiary of Power Solutions International, Inc.
	Nature of business operations
	The Company is a global producer and distributor of a broad range of high performance, certified low emission, power systems, including alternative fuel power systems for original equipment manufacturers of off-highway industrial equipment (“industrial OEMs”), and large custom-engineered integrated electrical power generation systems. The Company’s customers include large, industry-leading and/or multinational organizations. The Company’s products and services are sold predominantly to customers throughout North America, as well as, to customers located throughout the Pacific Rim and Europe. The Company operates as one business and geographic segment.
	The Company’s power systems are highly engineered, comprehensive systems which, through its technologically sophisticated development and manufacturing processes, including its in-house design, prototyping, testing and engineering capabilities and its analysis and determination of the specific components to be integrated into a given power system (driven in large part by emission standards and cost restrictions required, or desired, to be met), allow the Company to provide its customers with power systems customized to meet specific industrial OEM application requirements, other technical specifications of customers, and requirements imposed by environmental regulatory bodies. The Company’s power system configurations range from a basic engine integrated with appropriate fuel system components to completely packaged power systems that include any combination of cooling systems, electronic systems, air intake systems, fuel systems, housings, power takeoff systems, exhaust systems, hydraulic systems, enclosures, brackets, hoses, tubes and other assembled componentry. The Company purchases engines from third party suppliers and produces an internally-designed engine, all of which engines are then integrated into the Company’s power systems. Additionally, the Company is designing and developing other engines in-house. Of the other components that the Company integrates into its power systems, a substantial portion consist of internally designed components and components for which the Company coordinates significant design efforts with third party suppliers, with the remainder consisting largely of parts that are sourced off-the-shelf from third party suppliers. Some of the key components (including purchased engines) embody proprietary intellectual property of the Company’s suppliers. As a result of its design and manufacturing capabilities, the Company is able to provide its customers with a comprehensive power system which can be incorporated, using a single part number, directly into a customer’s specified application. Capitalizing on its expertise in developing and manufacturing emission-certified power systems and its access to the latest power system technologies, the Company believes that it is able to provide complete “green” power systems to industrial OEMs at a low cost and with fast design turnaround. In addition to the certified products described above, the Company sells diesel and non-certified power systems and aftermarket components.

Basis_of_presentation

Basis of presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of presentation	2. Basis of presentation
	Unaudited condensed consolidated financial statements
	The unaudited condensed consolidated financial statements of Power Solutions International, Inc. present information in accordance with GAAP, have been prepared pursuant to the rules and regulations of the SEC for interim financial reporting and, in the opinion of management, reflect all normal and recurring adjustments necessary to present fairly the interim periods of the unaudited condensed consolidated financial position, results of operations and cash flows of the Company and its wholly-owned subsidiaries for the periods presented.
	Certain amounts recorded in the prior period unaudited condensed consolidated financial statements presented have been reclassified to conform to the current period financial statement presentation. These reclassifications had no effect on previously reported net income.
	These unaudited condensed consolidated financial statements should be read in conjunction with, and have been prepared in conformity with the accounting principles reflected in, the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in annual financial statements and related notes prepared in accordance with GAAP have been condensed or omitted. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for the full year.
	Principles of consolidation
	The unaudited condensed consolidated financial statements presented herein include the accounts of Power Solutions International, Inc. and its direct and indirect wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2014 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 13, 2015. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2014.

Recently_issued_accounting_pro

Recently issued accounting pronouncements	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Recently issued accounting pronouncements	3. Recently issued accounting pronouncements
	The Company evaluates the pronouncements of authoritative accounting organizations, including the Financial Accounting Standards Board (FASB), to determine the impact of new pronouncements on GAAP and the Company. In May of 2014, the FASB and International Accounting Standards Board jointly issued a final standard on revenue recognition which outlines a single comprehensive model for entities to use in accounting for revenue arising from contracts with customers. This standard will supersede most current revenue recognition guidance. Under the new standard, entities are required to identify the following within a contract with a customer: the separate performance obligations in the contract; the transaction price; allocation of the transaction price to the separate performance obligations in the contract; and the appropriate amount of revenue to be recognized when (or as) the entity satisfies each performance obligation. The standard is effective for fiscal years, and the interim periods within those years, beginning after December 15, 2016. Entities have the option of using either retrospective transition or a modified approach in applying the new standard. The Company is currently evaluating the approach it will use to apply the new standard and the impact that the adoption of the new standard will have on the Company’s unaudited condensed consolidated financial statements. In April of 2015, the FASB issued guidance to simplify the presentation of debt issuance costs. This new guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The standard is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The Company is currently evaluating the approach it will use to apply the new standard and the impact that the adoption of the new standard will have on the Company’s unaudited condensed consolidated financial statements. There were no additional new accounting pronouncements or guidance that have been issued or adopted during the three months ended March 31, 2015, that are expected to have a significant effect on the Company’s unaudited condensed consolidated financial statements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Acquisitions	4. Acquisitions
	When appropriate, the Company accounts for business combinations in accordance with ASC 805, Business Combinations, and, as such, assets acquired and liabilities assumed are recorded at their respective fair values. The excess of the acquisition consideration over the fair value of tangible and intangible assets acquired and liabilities assumed, if any, is then allocated to goodwill. Any goodwill ultimately recorded is generally attributable to one or more values ascribed to, geographic expansion of product sales, manufacturing and other synergies of the combined businesses.
	The estimated fair values of assets acquired and liabilities assumed are based on the information that was available through the date of the most recent balance sheet, and are provisional, until the Company has completed the required analysis of fair values to be assigned to the assets acquired and liabilities assumed. The ultimate determination of fair values assigned to the assets acquired and liabilities assumed requires management to make significant assumptions and estimates. The more significant assumptions include estimating future cash flows and developing appropriate discount rates. These estimates and assumptions of the fair value allocation will be subject to change upon the finalization of all valuation analyses. When required, independent valuation specialists conduct valuations to assist management of the Company in determining the estimated fair values of trade receivables, inventory, machinery and equipment, intangible assets and liabilities assumed, including contingent consideration. The determination of these estimated fair values, the assets’ useful lives and the amortization and depreciation methods are subject to finalization of the work performed by the independent valuation specialists. Fair value measurements can be highly subjective, and the reasonable application of measurement principles may result in a range of alternative estimates using the same facts and circumstances. The final allocation could be materially different from the preliminary allocation recorded in the Company’s unaudited condensed consolidated balance sheet. However, the Company’s management is ultimately responsible for the values assigned. Although the final determinations may result in asset fair values that are materially different from the preliminary estimates of the amounts included in the Company’s unaudited condensed consolidated financial statements, the Company believes that the fair values ultimately assigned to the assets acquired and liabilities assumed will not materially differ from amounts initially recorded in the Company’s unaudited condensed consolidated financial statements.
	On March 18, 2015, the Company announced that it had acquired all of the membership interests in Buck’s Acquisition Company, LLC, (“Buck’s”) from UE Powertrain d/b/a Buck’s Engines and United Holdings, LLC, for an initial cash purchase price of approximately $9.7 million, subject to certain adjustments as defined by the purchase agreement. Buck’s is a manufacturer of alternative-fuel engines for industrial markets and was formerly a product line of United Engines, LLC. Buck’s supplies a range of alternative-fuel engines that run on natural gas, propane and liquid propane gas fuels. Buck’s targets an extensive range of industrial applications, including irrigation, gas compression, oil production, industrial equipment, power generation, mobile equipment, wind turbines, and re-power applications. The acquisition of Buck’s has been accounted for as a business combination in accordance with ASC 805, Business Combinations. The Company acquired primarily inventory, and to a lesser extent, fixed assets and intangible assets. The Company has provisionally recorded the assets acquired and liabilities assumed on its balance sheet as of March 31, 2015, since the date of acquisition; subject to the completion of the fair value analysis of the assets acquired and liabilities assumed. The aggregate purchase price, inclusive of all potential payments has not yet been finalized. Upon finalization of the aggregate purchase price and the determination of the fair values of the assets acquired and liabilities assumed, any excess of the purchase price over the fair values assigned will then be allocated to goodwill. Goodwill, if any, is anticipated to consist of the general elements identified in the first paragraph of this footnote. The Company treated the acquisition of Buck’s as a purchase of assets for income tax purposes. Accordingly, the financial and income tax bases of the assets and liabilities are expected to be the same at the date of acquisition, and a provision for deferred income tax will not be required to be recorded in connection with the purchase price allocation. Any excess of the purchase price over the fair value of the assets acquired is expected to be deductible for income tax purposes. The acquisition of Buck’s was funded through the Company’s revolving line of credit.
	On April 1, 2014, the Company acquired Professional Power Products, Inc. (“3PI”), pursuant to a stock purchase agreement with Carl L. Trent and Kenneth C. Trent (the “Trents”) and CKT Holdings Inc., a Wisconsin corporation owned by the Trents. 3PI is a leading designer and manufacturer of large, custom engineered integrated electrical power generation systems serving the global diesel and natural gas power generation markets. The Company treated the acquisition of 3PI as a purchase of assets for income tax purposes. The acquisition of 3PI was financed through the Company’s revolving line of credit and from proceeds received from a secured term loan.
	The accompanying unaudited condensed consolidated statements of operations include the activity of 3PI for the three months ended March 31, 2015 and no activity for the three months ended March 31, 2014.
	The Company incurred total transaction costs related to its acquisition activities of $200,000 and $811,000 for the three months ended March 31, 2015 and 2014, respectively, all of which was recognized as an operating expense and classified within general and administrative expenses in the Company’s unaudited condensed consolidated statement of operations in accordance with generally accepted accounting principles in the U.S. (“GAAP”).

Earnings_per_share

Earnings per share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings per share	5. Earnings per share
	The Company computes (loss) earnings per share by applying the guidance stated in ASC 260, Earnings per Share. The treasury stock method has been used to compute (loss) earnings per share. The Company has issued warrants (“Private Placement Warrants”) that represent the right to purchase shares of the Company’s common stock, a stock appreciation right (“SAR”) and restricted stock, all of which have been evaluated for their potentially dilutive effect under the treasury stock method. Refer to Note 11, “Stockholders’ equity” for a further description of the Private Placement Warrants and Note 10, “2012 Incentive compensation plan” for a further description of the SAR and restricted stock.
	Computation of dilutive common shares
	The Company utilizes the treasury stock method described in ASC 260-10-55 to determine the number of treasury shares assumed to be purchased from the hypothetical proceeds of exercise, with any residual shares representing the incremental common shares to be issued and included in diluted (loss) earnings per share. As of March 31, 2015, the Company’s Private Placement Warrants, SAR and restricted stock were evaluated for their potentially dilutive effect under the treasury stock method. Due to the loss reported in the unaudited condensed consolidated statements of operations, any potentially issuable shares of Company common stock associated with the Private Placement Warrants, SAR and restricted stock were not included in the dilutive EPS calculation for the three months ended March 31, 2015. These potential shares were excluded from the diluted EPS calculation because they would have had an anti-dilutive effect under the treasury stock method.
	As of March 31, 2014, the Company’s Private Placement Warrants, SAR and restricted stock were evaluated for their potentially dilutive effect under the treasury stock method. See the table below for detail as to the dilutive effect of using the treasury stock method.
	The computations of basic and diluted (loss) earnings per share for the three months ended March 31, 2015 and 2014, were as follows:
		Three months ended March 31,
		2015			2014
	Numerator:
	Net (loss) income	$	(1,456	)	$	2,374
	Change in the value of Private Placement Warrants		—			(233	)
		$	(1,456	)	$	2,141
	Denominator:
	Weighted average common shares outstanding-basic		10,797,056			10,542,460
	Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock		—			512,134
	Weighted average common shares outstanding-diluted		10,797,056			11,054,594
	(Loss) earnings per share of common stock – basic and diluted
	(Loss) earnings per share of common stock – basic	$	(0.13	)	$	0.23
	(Loss) earnings per share of common stock – diluted	$	(0.13	)	$	0.19

Inventories_net

Inventories, net	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventories, net	6. Inventories, net
	Inventories consist primarily of engines and parts. Engines are valued at the lower of cost, plus estimated freight-in, as determined by specific serial number identification, or market value. Parts are valued at the lower of cost (first-in, first-out) or market value. When necessary, the Company writes down inventory for an estimated amount equal to the difference between the cost of the inventory and the estimated realizable value. Additionally, an inventory reserve is recorded based upon the Company’s estimation of future demand for the quantity of inventory on hand. In determining an estimate of future demand, multiple factors are taken into consideration, including (i) customer purchase orders and customer forecasted demand; (ii) historical sales/usage for each inventory item; and (iii) utilization within a current or anticipated future power system.
	Inventory consisted of the following as of:
		March 31,			December 31,
		2015			2014
	Raw material	$	109,118		$	87,133
	Work in process		3,554			1,752
	Finished goods		7,396			6,777
	Total inventories		120,068			95,662
	Inventory allowance		(2,010	)		(1,759	)
	Inventories, net	$	118,058		$	93,903

Property_plant_and_equipment_n

Property, plant and equipment, net	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Property, plant and equipment, net	7. Property, plant and equipment, net
	The components of property, plant and equipment are recorded at cost and included the following as of:
		March 31,			December 31,
		2015			2014
	Land	$	260		$	260
	Buildings and improvements		5,627			5,015
	Office furniture and equipment		3,730			3,705
	Tooling and equipment		15,270			13,736
	Transportation equipment		525			525
	Construction in progress		5,963			6,056
	Property, plant and equipment, at cost		31,375			29,297
	Accumulated depreciation		(9,117	)		(8,405	)
	Property, plant and equipment, net	$	22,258		$	20,892

Fair_value_of_financial_instru

Fair value of financial instruments	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair value of financial instruments	8. Fair value of financial instruments
	As of March 31, 2015, and December 31, 2014, the Company measured its financial assets and liabilities under the amended ASC 820, Fair Value Measurements and Disclosures of the Accounting Standards Codification, which defines fair value as the price that would be received to sell an asset or paid to transfer a liability (i.e., exit price) in an orderly transaction between market participants at the measurement date. It also establishes a three-level valuation hierarchy for disclosures of fair value measurement as follows:
	Level 1 — quoted prices in active markets for identical assets or liabilities;
	Level 2 — other significant observable inputs for the assets or liabilities through corroborations with market data at the measurement date; and
	Level 3 — significant unobservable inputs that reflect management’s best estimate of what market participants would use to price the assets or liabilities at the measurement date.
	Private placement warrants liability
	As of March 31, 2015 and December 31, 2014, the Company’s liability for Private Placement Warrants was measured at fair value under ASC 820. The Company’s liability for the Private Placement Warrants is measured at fair value based on unobservable inputs, and thus is considered a Level 3 financial instrument. The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity and ASC 815, Derivatives and Hedging.
	As of March 31, 2015 and December 31, 2014, the Company estimated the fair value of its liability for Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following:
		March 31,			December 31,
		2015			2014
	Market value of the Company’s common stock	$	64.29		$	51.61
	Exercise price	$	13		$	13
	Risk-free interest rate		0.28	%		0.39	%
	Estimated price volatility		55	%		55	%
	Contractual term		1.08 years			1.33 years
	Dividend yield		—			—
	The market value of the Company’s common stock was based on its closing price on March 31, 2015 and December 31, 2014, the date of each valuation. The volatility factors noted above represented the upper end of the range of implied volatility of publicly traded call options of benchmark companies. If all other assumptions were held constant, a 10% change in the estimated price volatility in the Black Scholes option pricing model would have an insignificant effect on the recorded liability of the Private Placement Warrants.
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 Private Placement Warrants liability in the three months ended March 31, 2015:
	Balance at December 31, 2014	$	11,036
	Change in the value of private placement warrants		3,614
	Balance at March 31, 2015	$	14,650
	For the three months ended March 31, 2015, the Company recognized expense of $3,614,000 due to an increase in the estimated fair value of the Company’s liability for Private Placement Warrants. For the three months ended March 31, 2014, the Company recognized income of $233,000, due to a decrease in the estimated fair value of the Company’s liability for Private Placement Warrants. This expense (income) was recorded as “Private placement warrant expense (income)” in the Company’s unaudited condensed consolidated statements of operations for the respective periods.
	Financial liabilities measured at fair value
	The following table summarizes fair value measurements by level as of March 31, 2015, for the Company’s level 3 financial liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	14,650
	The following table summarizes fair value measurement by level as of December 31, 2014, for the Company’s level 3 financial liability measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	11,036
	Financial assets and liabilities not measured at fair value
	As of March 31, 2015 and December 31, 2014, the Company’s revolving line of credit and term debt, including accrued interest, recorded on the unaudited condensed consolidated balance sheets were carried at cost. The carrying value of the revolving line of credit and term debt approximate fair value because the interest rates fluctuate with market interest rates or the fixed rates approximate current rates offered to the Company for debt with similar terms and maturities, and the Company’s credit profile has not changed significantly since the origination of these financial liabilities. Under ASC 825, Financial Instruments, these financial liabilities are defined as Level 2 in the three-level valuation hierarchy, as the inputs to their valuation are market observable. The carrying value of cash, accounts receivable, inventories, prepaid expenses and other current assets, accounts payable and other accrued liabilities approximate fair value because of their short maturities.

Debt

Debt	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Debt	9. Debt
	Revolving line of credit and term debt
	On June 28, 2013, the Company entered into a credit agreement with Wells Fargo Bank, National Association (the “Wells Credit Agreement”), which replaced its prior credit agreement with BMO Harris Bank N.A. The Wells Credit Agreement enabled the Company to borrow under a revolving line of credit secured by substantially all of the Company’s tangible and intangible assets (other than real property). The Wells Credit Agreement (a) provided an initial maximum $75.0 million revolving line of credit to the Company, which, at the Company’s request and subject to the terms of the Wells Credit Agreement, could have been increased up to $100.0 million during the term of the Wells Credit Agreement; (b) bore interest at the Wells Fargo Bank’s prime rate plus an applicable margin ranging from 0% to 0.50%; or at the Company’s option, all or a portion of the revolving line of credit could have been designated to bear interest at LIBOR plus an applicable margin ranging from 1.50% to 2.00%; (c) had an unused line fee of 0.25% and (d) required the Company to report its fixed charge coverage ratio, when its Availability (as defined in the Wells Credit Agreement) was less than the Threshold Amount (as defined in the Wells Credit Agreement) and to continue to report its fixed charge coverage ratio until the date that Availability for a period of 60 consecutive days, was greater than or equal to the Threshold Amount. The Company was required to meet a minimum monthly fixed charge coverage ratio of not less than 1.0 to 1.0, the testing of which commenced on the last day of the month prior to the date on which its Availability was less than the Threshold Amount. The Threshold Amount was defined in the Wells Credit Agreement as the greater of (i) $9,375,000 or (ii) 12.5% of the maximum revolver amount of $75.0 million or as it may have been increased during the term of the Wells Credit Agreement up to $100.0 million.
	On April 1, 2014, the Wells Credit Agreement was amended (the “Amended Wells Credit Agreement”) to increase the Company’s revolving line of credit from $75.0 million to $90.0 million. The Amended Wells Credit Agreement (a) bears interest at the Wells Fargo Bank’s prime rate plus an applicable margin ranging from 0% to 0.5%; or at the Company’s option, all or a portion of the revolving line of credit can be designated to bear interest at LIBOR plus an applicable margin ranging from 1.50% to 2.00%; (b) has an unused line fee of 0.25%; (c) requires the Company to report its fixed charge coverage ratio and leverage ratio as described below; (d) includes a $5.0 million term loan arrangement with Wells Fargo Bank; and (e) includes a letter of credit sub-facility of the revolving line of credit. The principal amount of the $5.0 million term loan was payable in 36 equal monthly installments with the first payment due on June 1, 2014, plus interest at LIBOR plus 4.50%. As of March 31, 2015, the LIBOR rate on the term loan was 0.18%. The term loan may be paid in whole or in part without penalty at any time after June 30, 2014 upon at least 10 business days prior notice. Effective April 1, 2014 and during the period in which the term loan was outstanding, the Company was subject to a fixed charge coverage ratio covenant and a debt leverage ratio covenant. The Company was required to maintain a fixed charge coverage ratio of at least 1.20 to 1.00 and the Company’s debt leverage ratio may not exceed 4.0 to 1.0 during the period in which the term loan was outstanding. At the time, the Company used borrowings under this expanded revolving line of credit as well as the proceeds from the term loan to finance the acquisition of 3PI which was consummated on April 1, 2014 as described in Note 4, “Acquisitions.” The term loan was subsequently paid in full on April 29, 2015. In connection with the repayment of the term loan on April 29, 2015, the Company’s minimum monthly fixed charge coverage ratio reverted back to 1.0 to 1.0, the testing of which commences on the last day of the month prior to the date on which the Company’s Availability is less than the Threshold Amount.
	On September 30, 2014 and again on February 11, 2015, the Company further amended its credit facility with Wells Fargo Bank, National Association to increase its revolving line of credit facility to $100.0 million and $125.0 million, respectively, (collectively with the Amended Wells Credit Agreement, the “Amended Wells Credit Agreement II”). The Amended Wells Credit Agreement II is scheduled to mature on June 28, 2018.
	Other than the above-mentioned amendments, the terms and conditions of the Amended Wells Credit Agreement and Amended Wells Credit Agreement II are substantially similar to the Wells Credit Agreement. Under the Amended Wells Credit Agreement and Amended Wells Credit Agreement II, the amount that the Company may borrow is limited to the lesser of (i) the maximum available amount and (ii) borrowing base. The borrowing base is calculated as a percentage of the Company’s eligible accounts receivable and eligible inventory, plus a defined amount based upon certain of the Company’s fixed assets (all as defined in the Amended Wells Credit Agreement and Amended Wells Credit Agreement II). The Amended Wells Credit Agreement and Amended Wells Credit Agreement II also contain customary covenants and restrictions applicable to the Company, including agreements to provide financial information, comply with laws, pay taxes and maintain insurance, restrictions on the incurrence of certain indebtedness, guarantees and liens, restrictions on mergers, acquisitions and certain dispositions of assets, and restrictions on the payment of dividends and distributions. The revolving line of credit is secured by substantially all of the Company’s tangible and intangible assets (other than real property).
	On April 29, 2015, the Company entered into an amended credit facility (“Amended Wells Credit Agreement III”) for the purpose of facilitating the issuance of the 5.50% Senior Notes (the “Senior Notes”), as described below, and this amendment provides for the earlier maturity of the Amended Wells Credit Agreement III to insure that the Amended Wells Credit Agreement III will come due before the Senior Notes are payable as described below. While the Senior Notes are outstanding, the Amended Wells Credit Agreement III will become due 75 days prior to the earliest date that a Special Mandatory Purchase Date (as defined in the Indenture agreement below) may occur or 90 days prior to the final maturity date of the Senior Notes, as described in the Indenture agreement below.
	As of March 31, 2015, $91.0 million of the Company’s outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin. The weighted average interest rate on these borrowings was 1.67% as of March 31, 2015. The remaining outstanding balance of $11.4 million as of March 31, 2015 had been designated to bear interest at the prime rate, plus an applicable margin, which equaled 3.25% with the applicable margin included. The unused and available revolving line of credit balance was $21.5 million at March 31, 2015. As of March 31, 2015, the Company had approximately $3,611,000 outstanding under the term loan, which bore interest at LIBOR plus 4.50%, which equaled 4.68% with the applicable margin included. The term loan was subsequently repaid on April 29, 2015.
	As of December 31, 2014, $71.0 million of the Company’s outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin. The weighted average interest rate on these borrowings was 1.66% as of December 31, 2014. The remaining outstanding balance of $7.0 million as of December 31, 2014 had been designated to bear interest at the prime rate, plus an applicable margin, which equaled 3.25% with the applicable margin included. The unused and available revolving line of credit balance was $21.2 million at December 31, 2014. As of December 31, 2014, the Company had approximately $4,028,000 outstanding under the term loan, which bore interest at LIBOR plus 4.50%, which equaled 4.67% with the applicable margin included.
	5.50% Senior Notes
	On April 24, 2015, the Company entered into a purchase agreement with certain institutional investors for a private sale of an aggregate amount of $55.0 million of the Company’s unsecured 5.50% Senior Notes. The sale closed on April 29, 2015. In connection with the issuance of the Senior Notes, the Company entered into an indenture agreement (“Indenture”) dated April 29, 2015, by and among the Company, The Bank of New York Mellon, as Trustee, and the Company’s subsidiaries as guarantors. The Company received net proceeds of $53.6 million after initial transaction costs of approximately $1.4 million. The Senior Notes are unsecured debt of the Company and are effectively subordinated to the Company’s existing and future secured debt including the debt in connection with the Amended Wells Credit Agreement III. The Senior Notes have a final maturity date of May 1, 2018, provided that a mandatory offer by the Company to purchase the Senior Notes must be made on or prior to May 1, 2017 in the event the Company cannot or does not certify compliance with certain financial covenants as more fully described below.
	The Company may redeem the Senior Notes in whole or in part at any time on or after May 1, 2016, at the option of the Company at the following redemption prices (expressed as percentages of the principal amount), together with accrued and unpaid interest to the date of redemption:
	Redemption date	Redemption price
	May 1, 2016 through October 31, 2016		101	%
	November 1, 2016 and thereafter		100	%
	At any time prior to May 1, 2016, the Company may redeem up to 35% of the Senior Notes with the net cash proceeds of certain equity offerings specified in the Indenture at a redemption price of 105.5% of the principal amount of the Senior Notes, together with accrued and unpaid interest to the date of redemption, but only if at least 65% of the original aggregate principal amount of the Senior Notes would remain outstanding following such redemption. In addition, prior to May 1, 2016, the Company may redeem the Senior Notes in whole or in part at a redemption price equal to 101.0% of the principal amount plus (i) accrued and unpaid interest to the redemption date and (ii) an Applicable Premium (as defined in the Indenture) that is intended as a “make-whole” to May 1, 2016.
	Upon the occurrence of the earlier of (I) March 15, 2017, if the Trustee has not received on or within five days prior to such date an officers’ certificate stating that (i) the Company’s pro forma consolidated EBITDA (as defined in the Indenture) is at least equal to or greater than $35.0 million for the most recent four full fiscal quarters for which financial statements are available as of such date and (ii) the Company’s consolidated pro forma ratio of consolidated EBITDA to fixed charges (as defined in the Indenture) is at least equal to or greater than 3.25 to 1.0 for the most recent four full fiscal quarters for which financial statements are available as of such date or (II) the date on which the Company notifies the Trustee in writing (which date may be at any time on or after March 1, 2017 but on or prior to March 15, 2017) that the Company cannot or will not deliver such officers’ certificate, then, unless the Company has given on or prior to March 15, 2017 a notice of redemption of all of the Senior Notes, the Company will make a mandatory offer to purchase all of the Senior Notes at a purchase price of 100.0% of the principal amount plus accrued and unpaid interest, if any, to the date of purchase in accordance with the procedures set forth in the Indenture. The date of purchase will be no earlier than May 30, 2017.
	The Indenture contains covenants that, among other things, limit or restrict the ability of the Company and its subsidiaries to incur additional debt, prepay subordinated indebtedness, pay dividends or make other distributions on capital stock, redeem or repurchase capital stock, make investments and restricted payments, enter into transactions with affiliates, sell assets, create liens on assets to secure debt, or effect a consolidation or merger or to sell all, or substantially all, of the Company’s assets, in each case subject to certain qualifications and exceptions set forth in the Indenture. The Indenture also provides for customary events of default (subject in certain cases to customer grace and cure periods), which include nonpayment, breach of covenants in the Indenture, payment defaults or acceleration of other indebtedness, and certain events of bankruptcy and insolvency. Generally, if an event of default occurs, the Trustee or holders of at least 25.0% in principal amount of the then outstanding Senior Notes may declare the principal of and accrued but unpaid interest on all Senior Notes to be due and payable.
	Interest on the Senior Notes accrues at a rate of 5.50% per annum and is payable semi-annually in arrears on May 1 and November 1 of each year, commencing on November 1, 2015.

2012_Incentive_compensation_pl

2012 Incentive compensation plan	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
2012 Incentive compensation plan	10. 2012 Incentive compensation plan
	On May 30, 2012, the Board of Directors of the Company approved and adopted the Company’s 2012 Incentive Compensation Plan (the “2012 Plan”), and the 2012 Plan was approved by a majority of the Company’s stockholders at the Company’s annual meeting held on August 29, 2012. The 2012 Plan is administered by the Compensation Committee of the Board of Directors, which consists only of independent, non-employee directors.
	The 2012 Plan is a broad-based plan which allows for a variety of different types of awards, including (but not limited to) non-qualified stock options, incentive stock options, SAR, restricted stock, deferred stock and performance units, to be made to the Company’s executive officers, employees, consultants and directors. The 2012 Plan is intended to assist the Company in attracting and retaining exceptionally qualified employees, consultants and directors to support the sustained progress, growth and profitability of the Company.
	As of March 31, 2015, the Company had 1,530,925 shares reserved for awards under the 2012 Plan. Of these shares, 543,872 shares were underlying a SAR award granted to the Company’s Chief Operating Officer on June 6, 2012 and 185,993 shares of restricted stock have been granted as of March 31, 2015 to eligible employees (as further described below). As of March 31, 2015, the Company had 801,060 shares of common stock available for future issuance under the 2012 Plan.
	SAR award agreement
	On June 6, 2012 (the “SAR Grant Date”), the Compensation Committee of the Board of Directors approved, and the Company granted, a SAR to the Company’s Chief Operating Officer (“Grantee”), pursuant to the 2012 Plan and a Stock Appreciation Rights Award Agreement (“SAR Award Agreement”), dated as of the SAR Grant Date. The SAR granted to the Grantee covers an aggregate of 543,872 shares of Company common stock and is exercisable only in whole shares at a price per share of $22.07. The SAR expires on the tenth anniversary of the SAR Grant Date.
	The SAR granted to the Grantee vests and becomes exercisable ratably on each of the first three anniversaries of the SAR Grant Date (“graded vesting”). In addition, the SAR did not become exercisable until the date that was the last of any seven Valuation Dates (as defined in the SAR Award Agreement) within any period of ten or fewer consecutive Valuation Dates that commenced after the SAR Grant Date and prior to the expiration date on each of which the market value per share of Company common stock was at least $22.07. This market condition was met during the year ended December 31, 2013.
	The SAR entitles the Grantee to receive, upon any exercise, a number of shares of the Company’s common stock equal to (i) the number of shares for which the SAR is being exercised multiplied by the value of one share of the Company’s common stock on the date of exercise (determined as provided in the SAR Award Agreement), (ii) less the number of shares for which the SAR is being exercised multiplied by $22.07, (iii) divided by the value of one share of the Company’s common stock on the date of exercise (determined as provided in the SAR Award Agreement). The exercised SAR is to be settled only in whole shares of the Company’s common stock, and the value of any fractional share of the Company’s common stock will be forfeited.
	The SAR is accounted for as equity, in accordance with ASC 718, Compensation — Stock Compensation, which states that options or similar instruments on shares shall be classified as liabilities if either the underlying shares are classified as liabilities or the entity can be required under any circumstance to settle the option or similar instrument by transferring cash or other assets. The Company’s underlying shares are classified as equity, and under the terms of the SAR Award Agreement, the Company must settle the exercised portion of the SAR in shares of the Company’s common stock. As such, the Company has accounted for the SAR as equity.
	As of the SAR Grant Date, the fair value of the SAR was estimated using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the fair value of the Company’s common stock, exercise price, risk-free interest rate, estimated price volatility, term and dividend yield. Due to the limited trading activity in the Company’s common stock at the date of issuance of the SAR, the fair value of the Company’s common stock was established through multiple valuation techniques, including (a) the income approach in the form of the discounted cash flow method and (b) the market approach in the form of (i) the guideline public company method and (ii) the merger and acquisition method. After the fair value of the equity was determined, it was then allocated to the SAR using the Option Pricing Method. In addition to that described above, other assumptions used in the Black-Scholes method included the following as of the SAR Grant Date: an expected term of 6.0 years, a risk-free interest rate of 0.92%, an anticipated volatility factor of 55.0% and a zero dividend yield. The resulting valuation as of the SAR Grant Date, was discounted by 15%, reflecting an assessment of the then trading activity of the Company’s common stock (and by extension the SAR). The suggested value from the Black-Scholes method reflected a fully marketable security that was not burdened by limited marketability; however, at that time, the Company’s common stock (and by extension the SAR) did not have regular trading activity. Therefore, the Company considered it necessary to incorporate a discount to reflect the limited liquidity associated with the SAR. This approach was consistent with that utilized to value the Company’s Private Placement Warrants at that time. The resulting fair value of the SAR granted was $3.31 per underlying share.
	ASC 718, Compensation — Stock Compensation, was utilized in order to estimate the fair value of the SAR. The term “fair value” has been defined in Note 8, “Fair value of financial instruments.” ASC 718 requires an entity to measure the cost of employee services received in exchange for an award of equity instruments based on the fair value of the award as of the grant date. That cost is then recognized over the period during which an employee is required to provide service in exchange for the award. ASC 718-10-55-72 provides that, if vesting (or exercisability) of an award is based on satisfying both a market condition and a performance or service condition and it is probable that the performance or service condition will be satisfied, the initial estimate of the service period is the longest of the explicit, implicit or derived service period. The Company has computed compensation expense by applying the guidance stated in ASC 718, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards (graded vesting attribution method). Since, as noted above, the SAR granted by the Company includes both a market and service condition, the Company used the longest of the periods to define its requisite service period in each separately vesting portion or tranche. To determine the derived service period associated with the SAR’s market condition, the Company performed a Monte Carlo analysis in order to estimate the likely timeframe until the Company’s public equivalent value would exceed its aggregate exercise price over a period of seven days within a period of 10 or fewer trading days (i.e. the value at which the per share value of the Company’s equity exceeds $22.07). Based on the results of this analysis, the derived service period associated with the SAR’s market condition was determined to be 1.78 years. Thus, compensation expense for the first tranche was computed on a straight-line basis over the derived service period of 1.78 years. The second and third tranches were computed on a straight-line basis over the explicit service period.
	In the three months ended March 31, 2015 and 2014, the Company recognized $49,000 and $123,000, respectively, of expense for the SAR granted. As of March 31, 2015, there was approximately $37,000 of total unrecognized compensation expense related to the SAR granted under the 2012 Plan. The total SAR expense is expected to be approximately $1,800,000. The Company expects the remaining SAR expense to continue to be recognized over the next three months.
	Restricted stock awards
	The Compensation Committee of the Board of Directors has approved, and the Company granted, shares of Company restricted stock (“Restricted Stock”) to various employees pursuant to the 2012 Plan and subject in each case to a Restricted Stock Award Agreement (“Restricted Stock Award Agreement”). Restricted stock activity consisted of the following for the three months ended March 31, 2015:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-14		154,251	$	42.18
	Granted		—		—
	Forfeited		—		—
	Vested		—		—
	31-Mar-15		154,251	$	42.18
	These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement. In the three months ended March 31, 2015 and 2014, the Company recognized approximately $256,000 and $198,000, respectively, of compensation expense in connection with the Restricted Stock granted under the 2012 Plan. As of March 31, 2015, there was approximately $5,777,000 of total unrecognized compensation expense related to the shares of Restricted Stock granted under the 2012 Plan. As of March 31, 2015, the weighted-average period over which the unrecognized compensation cost is expected to be recognized was approximately 7 years.

Stockholders_equity

Stockholders' equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Stockholders' equity	11. Stockholders’ equity
	The Company’s equity securities and the Private Placement Warrants are described below.
	Common stock
	The Company has authorized 50,000,000 shares of common stock with a par value of $0.001 per share. Issued shares and outstanding shares of the Company’s common stock were 11,562,209 and 10,731,284, respectively, at each of March 31, 2015 and December 31, 2014. Each holder of a share of the Company’s common stock is entitled to one vote per share held on each matter to be considered by holders of the Company’s common stock. Holders of the Company’s common stock are entitled to receive ratably such dividends, if any, as may be declared by the Company’s board of directors. The Company’s current policy is to retain earnings for operations and growth. Upon any liquidation, dissolution or winding-up of the Company, the holders of the Company’s common stock are entitled to share ratably in all assets available for distribution, after payment of, or provision for, all liabilities and the preferences of any then outstanding shares of Company preferred stock. The holders of the Company’s common stock have no preemptive, subscription, redemption or conversion rights.
	Series A Convertible preferred stock
	The Company has authorized 114,000 shares of Series A Convertible preferred stock with a par value of $0.001 per share. As of March 31, 2015 and December 31, 2014, no shares of Series A Convertible preferred stock of the Company were issued or outstanding.
	SAR exercise for shares of Company common stock
	The Company granted a SAR to the Grantee on June 6, 2012 as further described in Note 10, “2012 Incentive compensation plan.” The Grantee has fully exercised the tranche that vested on June 6, 2013 and partially exercised the tranche that vested on June 6, 2014. As of March 31, 2015, there were 61,291 unexercised shares under the tranche that vested on June 6, 2014. There are 181,290 shares subject to the third and final tranche that vests on June 6, 2015.
	Restricted stock vesting for shares of Company common stock
	The Compensation Committee of the Board of Directors approved, and the Company granted, shares of Restricted Stock to various employees pursuant to the 2012 Plan and subject to a Restricted Stock Award Agreement as further described in Note 10, “2012 Incentive compensation plan.” For the three months ended March 31, 2015, no awards vested.
	Private placement warrants
	In connection with a private placement (“Private Placement”) on April 29, 2011, investors in the Private Placement received Company preferred stock (which subsequently converted to shares of Company common stock) and Private Placement Warrants. The Private Placement Warrants represented the right to purchase a total of 750,002 shares of the Company’s common stock at an exercise price of $13.00 per share, subject to further adjustment for non-cash dividends, distributions, stock splits or other reorganizations or reclassifications of the Company’s common stock. The Private Placement Warrants are also subject to full ratchet anti-dilution protection whereby, upon the issuance (or deemed issuance) of shares of the Company’s common stock at a price below the then-current exercise price of the Private Placement Warrants, subject to specified exceptions, the exercise price of the Private Placement Warrants will be reduced to the effective price of the Company’s common stock so issued (or deemed to be issued). The Private Placement Warrants will expire on April 29, 2016.
	At any time beginning six months after the closing of the Private Placement at which the Company is required to register the shares issuable upon exercise of the Private Placement Warrants pursuant to the registration rights agreement entered into in connection with the Private Placement, but such shares may not be freely sold to the public, the Private Placement Warrants may be “cashlessly” exercised by their holders. In such circumstances, the warrant holders may “cashlessly” exercise the Private Placement Warrants by causing the Company to withhold a number of shares of its common stock otherwise issuable upon such exercise having a value, based upon the market price of the Company’s common stock (such market price as defined in the purchase agreement for the Private Placement), equal to the aggregate exercise price associated with such exercise. In other words, in such circumstances, the exercise of the Private Placement Warrants will occur without any cash being paid by the holders of the Private Placement Warrants. Because the shares issuable upon exercise of the Private Placement Warrants are currently available for resale pursuant to effective registration statements filed by the Company with the SEC, the Private Placement Warrants may not be “cashlessly” exercised at this time. The Private Placement Warrants further include a requirement that, the Company will keep reserved out of the authorized and unissued shares of its common stock sufficient shares to provide for the exercise of the Private Placement Warrants.
	The Company’s Private Placement Warrants are accounted for as a liability, in accordance with ASC 480, Distinguishing Liabilities from Equity. ASC 480 states that, if an entity must or could settle an instrument by issuing a variable number of its own shares, and, as in this case, the obligation’s monetary value is based solely or predominantly on variations in the fair value of the company’s equity shares, but moves in the opposite direction, then the obligation to issue shares is to be recorded as a liability at the inception of the arrangement, and is adjusted with subsequent changes in the fair value of the underlying stock. The effect of the change in value of the obligation is reflected as “Private placement warrant expense (income)” in the Company’s consolidated statements of operations.
	The Private Placement Warrants issued had an estimated fair value of $2,887,000 at the closing of the Reverse Recapitalization transaction and the Private Placement on April 29, 2011, determined based upon an agreed-upon exercise price of the Private Placement Warrants; the purchase price for (value of) the Company’s preferred stock and Private Placement Warrants, in the aggregate as agreed upon with the investors in the Private Placement; an assessment of an appropriate risk-free interest rate of 2.1%, an anticipated volatility factor of 50.0%, and a zero percent dividend yield, all incorporated into a valuation using the Black-Scholes option pricing model. The Company determined that the five-year Treasury Bond yield was a reasonable assumption for a risk-free rate, and that an appropriate volatility rate would represent the upper end of the range of implied volatility of publicly traded call options of benchmark companies, which reflects the mid-range of their historical volatility. The Company’s past history of not paying dividends and management’s intentions to continue such a dividend policy resulted in a zero dividend yield assumption. The five-year term of the Private Placement Warrants, the stated warrant exercise price of $13.00 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, and the Company’s common stock valuation of $10.08 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, comprised the balance of the inputs into the Black-Scholes pricing model for the warrant valuation.
	See Note 8, “Fair value of financial instruments,” for detail describing the valuation approach for the Private Placement Warrants as of March 31, 2015 and December 31, 2014.
	There were no warrants exercised during the three months ended March 31, 2015. During the three months ended March 31, 2014, a portion of the Private Placement Warrants were exercised, resulting in the issuance of 40,252 shares of the Company’s common stock.
	As of March 31, 2015 and December 31, 2014, there were 287,257 shares of Company common stock reserved for the exercise of the outstanding Private Placement Warrants, in accordance with the terms of the purchase agreement for the Private Placement.
	Registration rights agreement
	In connection with the Private Placement, the Company entered into a Registration Rights Agreement (the “Private Placement Registration Rights Agreement”) with the investors in the Private Placement and Roth Capital Partners, LLC, pursuant to which it agreed to file a registration statement on Form S-1, with the SEC, covering the resale of “Registrable Securities” (as defined below) (which includes the shares of the Company’s common stock that were issuable upon conversion of shares of the Company’s preferred stock originally issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and shares of the Company’s common stock that were issuable upon exercise of the Roth Warrant), on or before the date which is 30 days after the closing date of the Private Placement, and to use its commercially reasonable efforts to have such registration statement declared effective by the SEC as soon as practicable. The Company further agreed, within 30 days after it becomes eligible to use a registration statement on Form S-3 to register the Registrable Securities for resale, to file a registration statement on Form S-3 covering the Registrable Securities. On June 27, 2013, within 30 days after the Company became eligible to use a registration statement on Form S-3, in accordance with the Private Placement Registration Rights Agreement, it filed a registration statement on Form S-3 (as a post-effective amendment to the registration statement on Form S-1) covering the Registrable Securities, which was declared effective on June 27, 2013.
	The Company is obligated to maintain the effectiveness of the registration statement until the earliest of (1) the first date on which all Registrable Securities covered by such registration statement have been sold, (2) the first date on which all Registrable Securities covered by such registration statement may be sold without restriction pursuant to Rule 144 or (3) the first date on which none of the securities included in the registration statement constitute Registrable Securities.
	Pursuant to the Private Placement Registration Rights Agreement, the holders of Registrable Securities are also entitled to certain piggyback registration rights if the Registrable Securities are not covered by one or more effective registration statements. As of December 31, 2013, and as of the time of the closing of the public offering on July 16, 2013, all of the Registrable Securities were covered by an effective registration statement. “Registrable Securities,” as contemplated by the Private Placement Registration Rights Agreement, means certain shares of the Company’s common stock, including those shares that were issuable upon conversion of shares of Company preferred stock issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and the shares of the Company’s common stock that were issued upon exercise of the Roth Warrant; provided, that, any such share shall cease to be a Registrable Security upon (A) sale pursuant to the registration statement or Rule 144 under the Securities Act, (B) such share becoming eligible for sale without restriction by the selling securityholder holding such security pursuant to Rule 144 under the Securities Act or (C) such share otherwise becoming eligible for sale without restriction pursuant to Section 4(1) of the Securities Act, provided that, any restrictive legend on any certificate or other instrument representing such shares has been removed or there has been delivered to the transfer agent for such shares irrevocable documentation (including any necessary legal opinion) to the effect that, upon submission by the applicable selling securityholder of the certificate or instrument representing such security, any such restrictive legend shall be removed.
	In connection with the consummation of the Reverse Recapitalization, the Company also entered into a registration rights agreement with the former stockholders of The W Group, pursuant to which it agreed to provide to such persons certain piggyback registration rights with respect to shares of the Company’s capital stock, including shares issuable upon exercise, conversion or exchange of securities, held by such persons at any time on or after the closing of the Reverse Recapitalization. The piggyback registration rights under this registration rights agreement are subject to customary cutbacks and are junior to the piggyback registration rights granted to investors in the Private Placement and to Roth pursuant to the Private Placement Registration Rights Agreement.
	In addition, the Company filed a universal shelf registration statement, which was declared effective on February 14, 2014, pursuant to which the Company may offer, issue and sell, from time to time, in one or more offerings, common stock, preferred stock, debt securities, depositary shares, warrants, subscription rights, stock purchase contracts and units.

Income_taxes

Income taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income taxes	12. Income taxes
	At the end of each interim period, the Company applies its estimated annual effective tax rate (“ETR”) to its interim earnings before considering the tax effect of any discrete items. The Company also records the tax impact of certain unusual or infrequently occurring items, including the effects of changes in valuation allowances and tax laws or rates, in the interim period in which they occur. A valuation allowance is established if it is determined that it is more likely than not that some portion or all of the net deferred income tax assets will not be realized. Management exercises significant judgment in determining the Company’s provisions for income taxes, its deferred income tax assets and liabilities and its future taxable income for purposes of assessing its ability to utilize any future tax benefit from its deferred income tax assets. Although management believes that its tax estimates are reasonable, the ultimate tax determination involves significant judgments that could become subject to audit by tax authorities in the ordinary course of business. As of each reporting date management considers new evidence, both positive and negative, that could impact management’s view with regards to future realization of deferred tax assets. As of March 31, 2015, management believes that it is more likely than not that all of the Company’s deferred income tax assets will be realized and no valuation allowance is required on its U.S. deferred tax assets. The Company recognizes interest and penalties related to unrecognized tax benefits in income tax expense. As of March 31, 2015 and December 31, 2014, the amount accrued for interest and penalties was not material to the Company’s financial statements.
	The computation of the estimated annual ETR for each interim period requires certain estimates and significant judgments, including, but not limited to, the expected operating income for the year, projections of the proportion of income earned and taxed in state jurisdictions, estimates of permanent and temporary differences, and the likelihood of recovering deferred tax assets generated in the current year. The accounting estimates used to compute the provision for income taxes may change as new events occur, additional information is obtained, or the tax environment changes. For the 2015 fiscal year, the Company’s estimated annual ETR is 39.0%, which excludes the impact of changes in the valuation of the Private Placement Warrants, as such amounts are excluded from the calculation of taxable income. Given the subjectivity and volatility of the valuation of the Private Placement Warrants, it is not possible to project the impact of the change in the Private Placement Warrants in the computation of the Company’s estimated annual ETR.
	As a result, the Company’s reported ETR will differ from the estimated annual ETR due to the changes in the valuation of the Private Placement Warrants in the periods in which such changes occur. Although the Company realized a pre-tax loss for the three months ended March 31, 2015, the Company recorded an income tax provision of $1,384,000. The pre-tax loss was attributable to the expense arising from a change in the value of the Private Placement Warrants since December 31, 2014. Excluding the impact of the change in the value of the Private Placement Warrants, the Company’s reported income tax rate would have been 39.1% in the three months ended March 31, 2015. The Company’s reported income tax rate was 34.6% for the three months ended March 31, 2014. Excluding the impact of the change in the value of the Private Placement Warrants, the Company’s reported income tax rate would have been 37.0% in the three months ended March 31, 2014.

Commitments_and_contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and contingencies	13. Commitments and contingencies
	The Company is involved in various legal proceedings from time to time arising in the normal course of doing business. The Company is required to record a provision for a liability when it is both probable that a liability has been incurred and the amount of the loss can be reasonably estimated; however, based upon a review of information currently available to the Company regarding the potential impact of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to the legal proceedings in which the Company is currently involved, the resolution of these legal proceedings, either individually or in the aggregate, is not expected to have a material effect on the Company’s consolidated results of operations, financial condition or cash flows.
	On December 7, 2012, the Company entered into a joint venture with another entity for the purpose of manufacturing, assembling and selling certain engines into the Asian markets. As of March 31, 2015, the production facility was complete and manufacturing has been scheduled to commence. In connection with this agreement, the Company has committed up to $1.2 million toward the joint venture of which $850,000 had been contributed since inception. On December 9, 2014, the Company signed an agreement to enter into a joint venture with a construction and utility equipment manufacturer headquartered in Incheon, South Korea. In connection with this agreement, the Company has committed up to $1.0 million which is expected to be contributed during 2015.

Subsequent_events

Subsequent events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent events	14. Subsequent events
	Acquisition of Powertrain Integration Acquisition, LLC
	On May 4, 2015, the Company entered into an Asset Purchase Agreement (“APA”) with Powertrain Integration, LLC and The Principals of Powertrain Integration, LLC, to acquire the assets of Powertrain Integration, LLC (“PI”). PI provides on-highway powertrain solutions, including systems, components and services for niche OEM automakers and fleets. PI also specializes in alternative-fuel as well as gasoline and diesel systems and offers design, engineering, testing and production capabilities to deliver one-stop vehicle integration. The acquisition is expected to close during the second quarter ending June 30, 2015 subject to the satisfactory completion of due diligence by the Company. The initial purchase price is $21.6 million in cash, subject to certain adjustments, plus working capital, assumed liabilities, a Base Earn-out Payment and Additional Earn-out Payment, all as described in the APA. The aggregate purchase price, inclusive of all potential payments has not yet been finalized. The Company expects to account for this acquisition as a business combination in accordance with ASC 805, Business Combinations, and as such, upon finalization of the aggregate purchase price and the determination of the fair values of the assets acquired and liabilities assumed, any excess of the purchase price over the fair values assigned is expected to be allocated to goodwill. The Company expects to treat the acquisition of PI as a purchase of assets for income tax purposes. Accordingly, the financial and income tax bases of the assets and liabilities are expected to be the same at the date of acquisition, and a provision for deferred income tax will not be required to be recorded in connection with the purchase price allocation. Additionally, any excess of the purchase price over the fair value of the assets acquired is expected to be deductible for income tax purposes. The acquisition is expected to be funded by the proceeds received from the issuance of the 5.50% Senior Notes described in Note 9, “Debt”.
	Acquisition of Bi-Phase Technologies, LLC
	On May 1, 2015, the Company acquired all of the membership interests in Bi-Phase Technologies, LLC, a Minnesota limited liability company (“Bi-Phase”) and wholly-owned subsidiary of TPB, Inc. a Minnesota corporation. Bi-Phase is engaged in the design and manufacture of liquid propane electronic fuel injection systems to allow for the conversion of vehicles from gasoline to propane. The initial purchase price was approximately $3.5 million in cash plus certain working capital, assumption of certain liabilities and Earn-out Payments as defined in the Membership Interest Purchase Agreement. The Company expects to account for this acquisition as a business combination in accordance with ASC 805, Business Combinations, and as such, upon finalization of the aggregate purchase price and the determination of the fair values of the assets acquired and liabilities assumed, any excess of the purchase price over the fair values assigned is expected to be allocated to goodwill. The Company expects to treat the acquisition of Bi-Phase as a purchase of assets for income tax purposes. Accordingly, the financial and income tax bases of the assets and liabilities are expected to be the same at the date of acquisition, and a provision for deferred income tax will not be required to be recorded in connection with the purchase price allocation. Additionally, any excess of the purchase price over the fair value of the assets acquired is expected to be deductible for income tax purposes. The acquisition has been funded by the proceeds received from the issuance of the 5.50% Senior Notes described in Note 9, “Debt”.

Basis_of_presentation_Policies

Basis of presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Unaudited condensed consolidated financial statements	Unaudited condensed consolidated financial statements
	The unaudited condensed consolidated financial statements of Power Solutions International, Inc. present information in accordance with GAAP, have been prepared pursuant to the rules and regulations of the SEC for interim financial reporting and, in the opinion of management, reflect all normal and recurring adjustments necessary to present fairly the interim periods of the unaudited condensed consolidated financial position, results of operations and cash flows of the Company and its wholly-owned subsidiaries for the periods presented.
	Certain amounts recorded in the prior period unaudited condensed consolidated financial statements presented have been reclassified to conform to the current period financial statement presentation. These reclassifications had no effect on previously reported net income.
	These unaudited condensed consolidated financial statements should be read in conjunction with, and have been prepared in conformity with the accounting principles reflected in, the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in annual financial statements and related notes prepared in accordance with GAAP have been condensed or omitted. The results of operations for the three months ended March 31, 2015 are not necessarily indicative of the results to be expected for the full year.
Principles of consolidation	Principles of consolidation
	The unaudited condensed consolidated financial statements presented herein include the accounts of Power Solutions International, Inc. and its direct and indirect wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation.
Significant accounting policies	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2014 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on March 13, 2015. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2014.
Earnings Per Share	The Company computes (loss) earnings per share by applying the guidance stated in ASC 260, Earnings per Share.
Distinguishing Liabilities from Equity	The Company analyzes financial instruments with features of both liabilities and equity under ASC 480, Distinguishing Liabilities from Equity
Derivatives and Hedging	The Company analyzes financial instruments with features of both liabilities and equity under ASC 815, Derivatives and Hedging.
Compensation - Stock Compensation	ASC 718, Compensation — Stock Compensation, was utilized in order to estimate the fair value of the SAR. The term “fair value” has been defined in Note 8, “Fair value of financial instruments.” ASC 718 requires an entity to measure the cost of employee services received in exchange for an award of equity instruments based on the fair value of the award as of the grant date. That cost is then recognized over the period during which an employee is required to provide service in exchange for the award. ASC 718-10-55-72 provides that, if vesting (or exercisability) of an award is based on satisfying both a market condition and a performance or service condition and it is probable that the performance or service condition will be satisfied, the initial estimate of the service period is the longest of the explicit, implicit or derived service period. The Company has computed compensation expense by applying the guidance stated in ASC 718, on a straight-line basis over the requisite service period for each separately vesting portion of the award as if the award was, in-substance, multiple awards (graded vesting attribution method). Since, as noted above, the SAR granted by the Company includes both a market and service condition, the Company used the longest of the periods to define its requisite service period in each separately vesting portion or tranche. To determine the derived service period associated with the SAR’s market condition, the Company performed a Monte Carlo analysis in order to estimate the likely timeframe until the Company’s public equivalent value would exceed its aggregate exercise price over a period of seven days within a period of 10 or fewer trading days (i.e. the value at which the per share value of the Company’s equity exceeds $22.07). Based on the results of this analysis, the derived service period associated with the SAR’s market condition was determined to be 1.78 years. Thus, compensation expense for the first tranche was computed on a straight-line basis over the derived service period of 1.78 years. The second and third tranches were computed on a straight-line basis over the explicit service period.

Earnings_per_share_Tables

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Schedule of Computations of Basic and Diluted Earnings (Loss) Per Share	The computations of basic and diluted (loss) earnings per share for the three months ended March 31, 2015 and 2014, were as follows:
		Three months ended March 31,
		2015			2014
	Numerator:
	Net (loss) income	$	(1,456	)	$	2,374
	Change in the value of Private Placement Warrants		—			(233	)
		$	(1,456	)	$	2,141
	Denominator:
	Weighted average common shares outstanding-basic		10,797,056			10,542,460
	Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock		—			512,134
	Weighted average common shares outstanding-diluted		10,797,056			11,054,594
	(Loss) earnings per share of common stock – basic and diluted
	(Loss) earnings per share of common stock – basic	$	(0.13	)	$	0.23
	(Loss) earnings per share of common stock – diluted	$	(0.13	)	$	0.19

Inventories_net_Tables

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Components of Inventory	Inventory consisted of the following as of:
		March 31,			December 31,
		2015			2014
	Raw material	$	109,118		$	87,133
	Work in process		3,554			1,752
	Finished goods		7,396			6,777
	Total inventories		120,068			95,662
	Inventory allowance		(2,010	)		(1,759	)
	Inventories, net	$	118,058		$	93,903

Property_plant_and_equipment_n1

Property, plant and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2015
Property, Plant and Equipment [Abstract]
Components of Property, Plant and Equipment	The components of property, plant and equipment are recorded at cost and included the following as of:
		March 31,			December 31,
		2015			2014
	Land	$	260		$	260
	Buildings and improvements		5,627			5,015
	Office furniture and equipment		3,730			3,705
	Tooling and equipment		15,270			13,736
	Transportation equipment		525			525
	Construction in progress		5,963			6,056
	Property, plant and equipment, at cost		31,375			29,297
	Accumulated depreciation		(9,117	)		(8,405	)
	Property, plant and equipment, net	$	22,258		$	20,892

Fair_value_of_financial_instru1

Fair value of financial instruments (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach	As of March 31, 2015 and December 31, 2014, the Company estimated the fair value of its liability for Private Placement Warrants with a publicly traded stock pricing approach using the Black-Scholes option pricing model. The inputs of the Black-Scholes option pricing model included the following:
		March 31,			December 31,
		2015			2014
	Market value of the Company’s common stock	$	64.29		$	51.61
	Exercise price	$	13		$	13
	Risk-free interest rate		0.28	%		0.39	%
	Estimated price volatility		55	%		55	%
	Contractual term		1.08 years			1.33 years
	Dividend yield		—			—
Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument	The following table summarizes the change in the estimated fair value of the Company’s Level 3 Private Placement Warrants liability in the three months ended March 31, 2015:
	Balance at December 31, 2014	$	11,036
	Change in the value of private placement warrants		3,614
	Balance at March 31, 2015	$	14,650
Financial Liability Measured at Fair Value on Recurring Basis	The following table summarizes fair value measurements by level as of March 31, 2015, for the Company’s level 3 financial liabilities measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	14,650
	The following table summarizes fair value measurement by level as of December 31, 2014, for the Company’s level 3 financial liability measured at fair value on a recurring basis:
		Level 1			Level 2			Level 3
	Private placement warrants liability		—			—		$	11,036

Debt_Tables

Debt (Tables)	3 Months Ended
	Mar. 31, 2015
Debt Disclosure [Abstract]
Summary of Redemption Price in Percentage	The Company may redeem the Senior Notes in whole or in part at any time on or after May 1, 2016, at the option of the Company at the following redemption prices (expressed as percentages of the principal amount), together with accrued and unpaid interest to the date of redemption:
	Redemption date	Redemption price
	May 1, 2016 through October 31, 2016		101	%
	November 1, 2016 and thereafter		100	%

2012_Incentive_compensation_pl1

2012 Incentive compensation plan (Tables)	3 Months Ended
	Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of Restricted Stock Unit Activity	Restricted stock activity consisted of the following for the three months ended March 31, 2015:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-14		154,251	$	42.18
	Granted		—		—
	Forfeited		—		—
	Vested		—		—
	31-Mar-15		154,251	$	42.18

Recovered_Sheet1

Description of the Company and Business Operations - Additional Information (Detail) (Business Segments [Member])	3 Months Ended
	Mar. 31, 2015
	Segment
Business Segments [Member]
Description Of Business And Significant Accounting Policies [Line Items]
Number of Operating Segments	1

Acquisition_Additional_Informa

Acquisition - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Mar. 18, 2015	Mar. 31, 2015	Mar. 31, 2014
General and Administrative Expense [Member]
Loans At Acquisition Date [Line Items]
Total transaction cost related to acquisition		200,000	$811,000
Buck's Engines, LP [Member]
Loans At Acquisition Date [Line Items]
Business acquisition agreement date		18-Mar-15
Initial cash purchase price on acquisition	$9,700,000

Earnings_Per_Share_Schedule_of

Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings (Loss) Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net (loss) income	($1,456)	$2,374
Change in the value of Private Placement Warrants	3,614	-233
Net (loss) income Attributable to Parent	($1,456)	$2,141
Common Shares [Member]
Denominator:
Weighted average common shares outstanding-basic	10,797,056	10,542,460
Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock		512,134
Weighted average common shares outstanding-diluted	10,797,056	11,054,594
(Loss) earnings per share of common stock - basic and diluted
(Loss) earnings per share of common stock - basic	($0.13)	$0.23
(Loss) earnings per share of common stock - diluted	($0.13)	$0.19

Inventories_Net_Components_of_

Inventories, Net - Components of Inventories (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory, Net [Abstract]
Raw material	$109,118	$87,133
Work in process	3,554	1,752
Finished goods	7,396	6,777
Total inventories	120,068	95,662
Inventory allowance	-2,010	-1,759
Inventories, net	$118,058	$93,903

Recovered_Sheet2

Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Property, Plant and Equipment [Abstract]
Land	$260	$260
Buildings and improvements	5,627	5,015
Office furniture and equipment	3,730	3,705
Tooling and equipment	15,270	13,736
Transportation equipment	525	525
Construction in progress	5,963	6,056
Property, plant and equipment, at cost	31,375	29,297
Accumulated depreciation	-9,117	-8,405
Property, plant and equipment, net	$22,258	$20,892

Recovered_Sheet3

Fair Value of Financial Instruments - Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach (Detail) (USD $)	0 Months Ended		3 Months Ended	12 Months Ended
	Jun. 06, 2012	Apr. 29, 2011	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exercise price			$13
Risk-free interest rate	0.92%
Estimated price volatility	55.00%	50.00%
Dividend yield		0.00%	0.00%
Private Placement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Market value of the Company's common stock			$64.29	$51.61
Exercise price			$13	$13
Risk-free interest rate			0.28%	0.39%
Estimated price volatility			55.00%	55.00%
Contractual term			1 year 29 days	1 year 3 months 29 days
Dividend yield			0.00%	0.00%

Recovered_Sheet4

Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Private placement warrant (income) expense	$3,614	($233)
Private Placement Warrants [Member] | Black-Scholes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated price volatility percentage	10.00%

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Summary of Change in Estimated Fair Value of Company's Level 3 Financial Instrument (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Change in the value of private placement warrants	$3,614	($233)
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance beginning	11,036
Change in the value of private placement warrants	3,614
Balance ending	$14,650

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Financial Liability Measured at Fair Value on Recurring Basis (Detail) (Level 3 [Member], USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Private placement warrants liability	$14,650	$11,036
Private Placement Warrants [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Private placement warrants liability	$14,650	$11,036

Debt_Additional_Information_De

Debt - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	0 Months Ended	12 Months Ended	0 Months Ended
	Dec. 31, 2014	Mar. 31, 2015	Apr. 01, 2014	Dec. 31, 2014	Jun. 28, 2013	Mar. 15, 2017	1-May-15	Feb. 11, 2015	Sep. 30, 2014	Apr. 29, 2015
Line of Credit Facility [Line Items]
Outstanding borrowings under its revolving line of credit	$71,000,000	$91,000,000		$71,000,000
Line of Credit bears interest at BMO Bank's LIBOR rate	1.66%	1.67%		1.66%
Remaining outstanding balance	7,000,000	11,400,000		7,000,000
Percentage of applicable margin interest rate	3.25%	3.25%		3.25%
Unused and available line of credit balance	21,200,000	21,500,000		21,200,000
Initial transaction costs related to indenture agreement	1,400,000
Net proceeds after initial transaction costs	53,600,000
Certain events of bankruptcy, redemption percentage of principal amount of notes outstanding with accrued and unpaid interest		25.00%
Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Percentage of revolving unused line fee			0.25%
Term Loan B Debt [Member]
Line of Credit Facility [Line Items]
Line of credit, LIBOR		LIBOR plus 4.50%		LIBOR plus 4.50%
Outstanding borrowings under its revolving line of credit	4,028,000	3,611,000		4,028,000
Percentage of applicable margin interest rate	4.67%	4.68%		4.67%
London Interbank Offered Rate (LIBOR) [Member]
Line of Credit Facility [Line Items]
Line of credit, interest at LIBOR		0.05%		0.05%
Minimum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit					75,000,000
Applicable margin, during the period			0.00%		0.00%
Line of credit, interest at LIBOR			1.50%		1.50%
Maximum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit					100,000,000
Applicable margin, during the period			0.50%		0.50%
Line of credit, interest at LIBOR			2.00%		2.00%
Percentage of revolving unused line fee					0.25%
Consecutive days of liquidity threshold					60 days
Liquidity threshold					9,375,000
Percent of total credit facility					12.50%
Subsequent Event [Member]
Line of Credit Facility [Line Items]
Proforma consolidated EBITDA						35,000,000
Proforma ratio of consolidated EBITDA						1
Debt instrument principal amount percentage including accrued and unpaid interest						100.00%
Debt instrument accrued percentage							5.50%
Amended Wells Credit Agreement I [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit								125,000,000	100,000,000
Line of credit, interest at LIBOR		0.18%	4.50%
Amortization period			36 months
Line of credit facility covenants maximum debt leverage ratio		4
Line of credit facility covenants minimum fixed charge coverage ratio		1
Line of credit, LIBOR			LIBOR plus 4.50%
Credit agreement maturity date		28-Jun-18
Senior notes matures		75 days
Senior notes closing period		90 days
Amended Wells Credit Agreement I [Member] | Term Loan B Debt [Member]
Line of Credit Facility [Line Items]
Long term borrowings			5,000,000
Amended Wells Credit Agreement I [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Line of credit facility covenants minimum fixed charge coverage ratio		1.2
Amended Wells Credit Agreement I [Member] | Minimum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit			75,000,000
Amended Wells Credit Agreement I [Member] | Maximum [Member] | Wells Fargo Bank, N.A [Member]
Line of Credit Facility [Line Items]
Agreement provides for borrowings under a revolving line of credit			90,000,000
Notes payable [Member] | Amended Wells Credit Agreement I [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Senior notes issuance percentage										5.50%
Five Point Five Zero Percent Senior Notes [Member]
Line of Credit Facility [Line Items]
Aggregate purchase amount on agreement with institutional investors	$55,000,000
Closing date of sale of agreement	29-Apr-15
Debt instrument redemption description		The Company may redeem up to 35% of the Senior Notes with the net cash proceeds of certain equity offerings specified in the Indenture at a redemption price of 105.5% of the principal amount of the Senior Notes, together with accrued and unpaid interest to the date of redemption, but only if at least 65% of the original aggregate principal amount of the Senior Notes would remain outstanding following such redemption. In addition, prior to MayB 1, 2016, the Company may redeem the Senior Notes in whole or in part at a redemption price equal to 101.0% of the principal amount plus (i)B accrued and unpaid interest to the redemption date and (ii)B an Applicable Premium (as defined in the Indenture) that is intended as a bmake-wholeb to MayB 1, 2016.
Five Point Five Zero Percent Senior Notes [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Redeemable percentage on senior notes							101.00%
Debt instrument, redemption price, percentage of principal amount redeemed							105.00%
Percentage of principal amount, plus accrued and unpaid interest with proceeds of certain equity offerings							65.00%
Five Point Five Zero Percent Senior Notes [Member] | Subsequent Event [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Redeemable percentage on senior notes							35.00%

Debt_Summary_of_Redemption_Pri

Debt - Summary of Redemption Price in Percentage (Detail) (Subsequent Event [Member])	0 Months Ended
	1-May-16
May 1, 2016 through October 31, 2016 [Member]
Debt Instrument, Redemption [Line Items]
Redemption price	101.00%
November 1, 2016 and Thereafter [Member]
Debt Instrument, Redemption [Line Items]
Redemption price	100.00%

Recovered_Sheet5

2012 Incentive Compensation Plan - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended
	Jun. 06, 2012	Apr. 29, 2011	Mar. 31, 2015	Mar. 31, 2014	Jun. 06, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted under SAR Award Agreement	543,872				543,872
Common stock, market value per share			$22.07
Valuation dates of common stock under SAR award agreement, description			Commenced after the SAR Grant Date and prior to the expiration date
SAR award expiration period from grant date			10 years
Expected term			6 years
Risk-free interest rate	0.92%
Dividend yield			$0
Anticipated volatility factor and zero dividend yield	55.00%	50.00%
Discount on valuation of trading activity			15.00%
Service period			1 year 9 months 11 days
Expenses for the SAR granted			49,000	123,000
Total unrecognized compensation expense			37,000
Total expected expense			1,800,000
Expected period of recognition of cost			3 months
Employee Stock Option 2012 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock agreement vesting			These shares of Restricted Stock vest in various increments and periods over a maximum of ten years from the date the stock was granted as defined under the applicable Restricted Stock Award Agreement.
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected term to exceed public equivalent value over aggregate exercise price			$22.07
Stock Compensation Plan [Member] | 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for stock-based compensation			1,530,925
Common stock available for further issuance			801,060
SAR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of SAR granted			$3.31
SAR [Member] | Chief Operating Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted to employees	543,872
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares granted to employees			185,993
Fair value of SAR granted			$0
Expected period of recognition of cost			7 years
Compensation expenses			256,000	198,000
Restricted Stock [Member] | 2012 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation expense			$5,777,000
Restricted Stock [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period for restricted stock			10 years

Recovered_Sheet6

2012 Incentive Compensation Plan - Summary of Restricted Stock Unit Activity (Detail) (Restricted Stock [Member], USD $)	3 Months Ended
	Mar. 31, 2015
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Beginning balance, shares	154,251
Granted, shares	0
Forfeited, shares	0
Vested, shares	0
Ending balance, shares	154,251
Weighted average grant date fair value, beginning balance	$42.18
Granted, weighted average grant date fair value	$0
Forfeited, weighted average grant date fair value	$0
Vested, weighted average grant date fair value	$0
Weighted average grant date fair value, ending balance	$42.18

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended		12 Months Ended
	Jun. 06, 2012	Apr. 29, 2011	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jun. 06, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Series A convertible preferred stock, shares authorized			114,000		114,000
Series A convertible preferred stock, par value			$0.00		$0.00
Series A convertible preferred stock, shares issued			0		0
Series A convertible preferred stock, shares outstanding			0		0
Common stock, shares authorized			50,000,000		50,000,000
Common stock, par value			$0.00		$0.00
Common stock, shares issued			11,562,209		11,562,209
Common stock, shares outstanding			10,731,284		10,731,284
Shares of common stock issuable upon exercise of the private placement warrant			750,002
Common stock exercise price			$13
Estimated fair value		$2,887,000
Volatility factor	55.00%	50.00%
Risk-free interest rate		2.10%
Dividend yield		0.00%	0.00%
Private placement warrants term			5 years
Common stock valuation exercise price			$10.08
Series A Preferred Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Series A convertible preferred stock, shares authorized			114,000
Series A convertible preferred stock, par value			$0.00
Series A convertible preferred stock, shares issued			0		0
Series A convertible preferred stock, shares outstanding			0		0
SAR [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unexercised shares vested under Stock appreciation right			61,291
Subsequent Event [Member] | SAR [Member] | Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation right shares vested						181,290
Private Placement Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock exercise price			$13
Shares issued for warrants exercised			0	40,252
Common stock reserved for the exercise of the Private Placement Warrants			287,257		287,257
Private Placement [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock exercise price			$13		$13
Warrants expiry date			29-Apr-16
Volatility factor			55.00%		55.00%
Dividend yield			0.00%		0.00%

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Company's annual effective tax rate	39.00%
Company's quarterly effective tax rate		34.60%
Income tax provision	$1,384	$1,258
Company's income tax rate excluding impact of income/expense associated with private placement warrants	39.10%	37.00%

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended	28 Months Ended
	Mar. 31, 2015	Mar. 31, 2015
December 7, 2012 Agreement [Member]
Commitment And Contingencies [Line Items]
Commitment towards investments in joint venture	$1,200,000
Contribution to joint venture		850,000
December 9, 2014 Agreement [Member]
Commitment And Contingencies [Line Items]
Commitment towards investments in joint venture	$1,000,000

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended
In Millions, unless otherwise specified	Mar. 31, 2015	4-May-15	1-May-15
Bi-Phase Technologies Limited Liability Company [Member]
Subsequent Event [Line Items]
Business acquisition agreement date	1-May-15
Subsequent Event [Member] | Powertrain Integration Limited Liability Company [Member]
Subsequent Event [Line Items]
Interest rate on senior notes		5.50%
Initial cash purchase price on acquisition		$21.60
Subsequent Event [Member] | Bi-Phase Technologies Limited Liability Company [Member]
Subsequent Event [Line Items]
Interest rate on senior notes			5.50%
Initial cash purchase price on acquisition			$3.50