Power Solutions International (PSIX) 10-Q 9 May 14 2014 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2014	6-May-14
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	31-Mar-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q1	'
Trading Symbol	'PSIX	'
Entity Registrant Name	'Power Solutions International, Inc.	'
Entity Central Index Key	'0001137091	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	10,562,139

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Current assets	'	'
Cash	$3,649	$6,306
Accounts receivable, net	48,908	42,730
Inventories, net	68,748	55,986
Prepaid expenses and other current assets	1,466	2,173
Deferred income taxes	2,811	2,811
Total current assets	125,582	110,006
Property, plant & equipment, net	14,264	13,104
Other noncurrent assets	3,579	3,509
TOTAL ASSETS	143,425	126,619
Current liabilities	'	'
Accounts payable	32,518	24,444
Income taxes payable	418	167
Accrued compensation and benefits	1,967	3,758
Other accrued liabilities	3,277	4,016
Total current liabilities	38,180	32,385
LONG-TERM OBLIGATIONS	'	'
Revolving line of credit	26,159	17,933
Deferred income taxes	304	304
Private placement warrants	22,066	24,525
Other noncurrent liabilities	851	1,051
TOTAL LIABILITIES	87,560	76,198
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, 2014 and December 31, 2013.	'	'
Common stock - $0.001 par value. Authorized: 50,000,000 shares. Issued: 11,393,064 and 11,352,812 shares at March 31, 2014 and December 31, 2013, respectively. Outstanding: 10,562,139 and 10,521,887 at March 31, 2014 and December 31, 2013, respectively.	11	11
Additional paid-in-capital	60,378	57,308
Accumulated deficit	-274	-2,648
Treasury stock, at cost, 830,925 shares at March 31, 2014 and December 31, 2013.	-4,250	-4,250
TOTAL STOCKHOLDERS' EQUITY	55,865	50,421
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$143,425	$126,619

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2014	Dec. 31, 2013
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	11,393,064	11,352,812
Common stock, shares outstanding	10,562,139	10,521,887
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, 2014	Mar. 31, 2013
Net sales	$66,735	$52,576
Cost of sales	54,805	43,407
Gross profit	11,930	9,169
Operating expenses:	'	'
Research & development and engineering	3,598	1,771
Selling and service	1,827	1,880
General and administrative	2,984	2,438
Total operating expenses	8,409	6,089
Operating income	3,521	3,080
Other (income) expense:	'	'
Interest expense	99	194
Private placement warrant (income) expense	-233	4,846
Other (income) expense, net	23	'
Total other (income) expense	-111	5,040
Income (loss) before income taxes	3,632	-1,960
Income tax provision	1,258	967
Net income (loss)	$2,374	($2,927)
Common Shares [Member]	'	'
Weighted-average common shares outstanding:	'	'
Basic	10,542,460	9,100,111
Diluted	11,054,594	9,100,111
Earnings (loss) per share - basic Common shares	$0.23	($0.32)
Earnings (loss) per share - diluted Common shares	$0.19	($0.32)

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities	'	'
Net income (loss)	$2,374	($2,927)
Adjustments to reconcile net income (loss) to net cash (used in) provided by operating activities:	'	'
Depreciation and amortization	488	364
Non-cash interest expense	14	18
Share-based compensation expense	321	207
Decrease in accounts receivable allowances	-8	-16
Increase in inventory reserves	183	368
(Decrease) increase in valuation of private placement warrant liability	-233	4,846
Loss on investment in joint venture	33	'
(Increase) decrease in operating assets:	'	'
Accounts receivable	-6,170	809
Inventories	-12,945	-1,946
Prepaid expenses and other assets	580	485
Increase (decrease) in operating liabilities:	'	'
Accounts payable	7,220	-4,852
Accrued compensation and benefits and other accrued liabilities	-2,530	-665
Income taxes payable	418	914
Other noncurrent liabilities	-367	14
Net cash used in operating activities	-10,622	-2,381
Cash flows from investing activities	'	'
Purchases of property, plant, equipment and other assets	-784	-667
Net cash used in investing activities	-784	-667
Cash flows from financing activities	'	'
Proceeds from exercise of private placement warrants	523	1,797
Net cash provided by financing activities	8,749	2,800
Decrease in cash	-2,657	-248
Cash at beginning of period	6,306	543
Cash at end of period	3,649	295
Supplemental disclosures of cash flow information	'	'
Cash paid for interest	86	201
Cash paid for income taxes	'	55
Supplemental disclosure of non-cash transactions	'	'
Unpaid property, plant, equipment and other assets	854	371
Fair value of private placement warrants exercised	2,226	1,457
Noncurrent obligation [Member]	'	'
Cash flows from financing activities	'	'
Advances from revolving line of credit	14,126	27,503
Repayments of revolving line of credit	($5,900)	($26,500)

Description_of_the_company_and

Description of the company and business operations	3 Months Ended
	Mar. 31, 2014
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”). The Company’s customers include companies that are 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 Asia 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 to its customers 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, 2014
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 generally accepted accounting principles in the U.S. (“GAAP”), have been prepared pursuant to the rules and regulations of the SEC 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.
	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 PSI’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in the financial statements and related notes prepared in accordance with GAAP have been condensed or omitted.
	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 (a complete list of our subsidiaries is included as an exhibit to our annual report on Form 10-K for the fiscal year ended December 31, 2013). All significant intercompany balances and transactions have been eliminated in consolidation.
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2013 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 28, 2014. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2013.

Recently_issued_accounting_pro

Recently issued accounting pronouncements	3 Months Ended
	Mar. 31, 2014
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. There were no new accounting pronouncements that have been issued or adopted during the three months ended March 31, 2014, that are expected to have a significant effect on the Company’s unaudited condensed consolidated financial statements.

Earnings_per_share

Earnings per share	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Earnings per share	'
	4. Earnings per share
	The Company computes earnings (loss) per share by applying the guidance stated in ASC 260, Earnings per Share, to determine the net income (loss) available per share of its common stock. The treasury stock method has been used to compute earnings (loss) per share. The Company has issued warrants (“Private Placement Warrants”) that represent the right to purchase shares of the Company’s common stock, stock appreciation rights (“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 proceeds of warrant exercises, with any residual shares representing the incremental common shares to be issued and included in diluted EPS. 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.
	As of March 31, 2013, the Company’s Private Placement Warrants and SAR were evaluated for their potentially dilutive effect. 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 and the SAR granted were not included in the dilutive EPS calculation for the three months ended March 31, 2013. These potential shares were excluded from the diluted EPS calculation because they would have an anti-dilutive effect under the treasury stock method.
	The computations of basic and diluted earnings (loss) per share for the three months ended March 31, 2014 and 2013, respectively, were as follows:
		Three months ended March 31,
		2014			2013
	Numerator:
	Net income (loss)	$	2,374		$	(2,927	)
	Change in the value of private placement warrants		(233	)		—
		$	2,141		$	(2,927	)
	Denominator:
	Weighted average common shares outstanding-basic		10,542,460			9,100,111
	Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock		512,134			—
	Weighted average common shares outstanding-diluted		11,054,594			9,100,111
	Earnings (loss) per share of common stock – basic and diluted
	Earnings (loss) per share of common stock – basic	$	0.23		$	(0.32	)
	Earnings (loss) per share of common stock – diluted	$	0.19		$	(0.32	)

Inventories_net

Inventories, net	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Inventories, net	'
	5. 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. The Company’s inventory reserve was $1,662,000 and $1,335,000, as of March 31, 2014 and December 31, 2013, respectively.
	Inventory consisted of the following as of:
		March 31, 2014		December 31, 2013
	Raw material	$	65,216	$	53,538
	Finished goods		3,532		2,448
	Total	$	68,748	$	55,986

Property_plant_and_equipment_n

Property, plant and equipment, net	3 Months Ended
	Mar. 31, 2014
Property Plant And Equipment [Abstract]	'
Property, plant and equipment, net	'
	6. Property, plant and equipment, net
	The components of property, plant and equipment are recorded at cost and included the following as of:
		March 31, 2014			December 31, 2013
	Land	$	260		$	260
	Buildings and improvements		4,016			4,125
	Office furniture and equipment		2,907			2,723
	Tooling and equipment		9,285			7,595
	Transportation equipment		203			203
	Construction in progress		4,510			4,844
	Property, plant and equipment, at cost		21,181			19,750
	Accumulated depreciation		(6,917	)		(6,646	)
	Property, plant and equipment, net	$	14,264		$	13,104

Fair_value_of_financial_instru

Fair value of financial instruments	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Fair value of financial instruments	'
	7. Fair value of financial instruments
	As of March 31, 2014, and December 31, 2013, the Company measured its financial assets and liabilities under the amended ASC Topic 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, 2014, and December 31, 2013, the Company’s Private Placement Warrants were measured at fair value under ASC Topic 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, 2014, and December 31, 2013, the Company estimated the fair value of its 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 as of:
		March 31, 2014			December 31, 2013
	Market value of the Company’s common stock	$	75.17		$	75.1
	Exercise price	$	13		$	13
	Risk-free interest rate		0.48	%		0.51	%
	Estimated price volatility		42.5	%		42.5	%
	Contractual term		2.08 years			2.33 years
	Dividend yield		—			—
	The market value of the Company’s common stock was based on its closing price on March 31, 2014, and December 31, 2013, 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, the recorded liability of the Private Placement Warrants would increase or decrease by approximately $2.0 million due to a 10% change in the value of these warrants based on the Black-Scholes option pricing model.
	The following table summarizes fair value measurement by level as of March 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		—			—		$	22,066
	The following table summarizes fair value measurements by level as of December 31, 2013, 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		—			—		$	24,525
	The following table summarizes the change in the estimated fair value of the Company’s Level 3 financial instrument in the three months ended March 31, 2014:
	Balance at December 31, 2013	$	24,525
	Fair value of private placement warrants exercised		(2,226	)
	Change in the value of private placement warrants		(233	)
	Balance at March 31, 2014	$	22,066
	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 Private Placement Warrants. For the three months ended March 31, 2013, the Company recognized expense of $4,846,000 due to an increase in the estimated fair value of the Company’s Private Placement Warrants. This (income) expense was recorded as “Private placement warrant (income) expense” in the Company’s unaudited condensed consolidated statements of operations for the respective periods.
	Financial assets and liabilities not measured at fair value
	As of March 31, 2014, and December 31, 2013, the Company’s revolving line of credit, including accrued interest, recorded on the unaudited condensed consolidated balance sheets was carried at cost. The carrying value of the revolving line of credit approximates 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 Topic 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.

Revolving_line_of_credit

Revolving line of credit	3 Months Ended
	Mar. 31, 2014
Text Block [Abstract]	'
Revolving line of credit	'
	8. Revolving line of credit
	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. (“BMO Bank”) (the “Amended Harris Agreement II”) as described below. 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, is 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 the Company’s Availability (as defined in the Wells Credit Agreement) 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 be 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 and; (d) includes a $5.0 million term loan arrangement with Wells Fargo. The principal amount of the $5.0 million term loan is payable in 36 equal installments with the first payment due on June 1, 2014. The term loan may be paid in whole or in part 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 is outstanding, the Company will be subject to a fixed charge coverage ratio covenant and a debt leverage ratio covenant. The Company will be 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 is outstanding.
	Other than the above mentioned amendments, the terms and conditions of the Amended Wells Credit Agreement are substantially similar to the Wells Credit Agreement. Under the Amended Wells Credit Agreement, the amount that the Company may borrow is limited to the lesser (i) of 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 Wells Credit Agreement). The Amended Wells Credit Agreement also contains 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). The Amended Wells Credit Agreement is scheduled to mature on June 28, 2018.
	The Amended Harris Agreement II was a loan and security agreement entered into with BMO Bank on April 29, 2011 and subsequently amended on March 20, 2012 and again on November 8, 2012. The Amended Harris Agreement II was a $50.0 million credit facility with a maturity date of March 20, 2017. Under the terms of the Amended Harris Agreement II: (a) the revolving line of credit bore interest at BMO 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 1.75% to 2.25%; (b) the unused revolving line fee was 0.25%; and (c) the Company was only required to report its compliance with the fixed charge coverage ratio for any month when the Company’s Excess Availability, (as defined in the Amended Harris Agreement II), was less than the Liquidity Threshold. The Liquidity Threshold was defined in the Amended Harris Agreement II as the greater of (i) $7.5 million or (ii) 12.5% of the total credit facility of $50.0 million, as may have been reduced from time to time pursuant to the terms of the Amended Harris Agreement II.
	As of March 31, 2014, $26.0 million of the Company’ outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin, which equaled 1.65%. The remaining outstanding balance of $159,000 as of March 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 $48.8 million at March 31, 2014.
	On April 1, 2014, immediately following the acquisition of Professional Power Products, Inc. the Company’s outstanding borrowings on the revolving line of credit were approximately $66.6 million and the remaining unused and available revolving line of credit balance was approximately $19.3 million.
	As of December 31, 2013, $9.0 million of the Company’s outstanding borrowings under its revolving line of credit bore interest at the LIBOR rate, plus an applicable margin, which equaled 1.67%. The remaining outstanding balance of $8.9 million as of December 31, 2013, bore interest at the prime rate, which equaled 3.25% with the applicable margin included. The unused and available revolving line of credit balance was $47.9 million at December 31, 2013.

Income_taxes

Income taxes	3 Months Ended
	Mar. 31, 2014
Income Tax Disclosure [Abstract]	'
Income taxes	'
	9. 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. Any penalties and/or interest incurred in connection with the payment of the Company’s income tax obligations are classified within general and administrative expenses and interest expense, respectively.
	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 2014 fiscal year, the Company’s estimated annual ETR is 37.0%, 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. Accordingly, the Company’s reported income tax rate was 34.6% for the three months ended March 31, 2014. For the three months ended March 31, 2013, the Company reported a pre-tax loss. The pre-tax loss was attributable to the expense recognized from a change in the valuation of the Private Placement Warrants during the period, which amount, as noted above, is permanently excluded from the computation of taxable income. As such, the Company’s reported income tax rate was not meaningful in the three months ended March 31, 2013 for this reason.
	Excluding the impact of the changes in the valuation of the Private Placement Warrants on results of operations, the Company’s reported effective income tax rates would have been 37.0% and 33.5% in the three months ended March 31, 2014 and 2013, respectively.

2012_Incentive_compensation_pl

2012 Incentive compensation plan	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased 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.
	Under the 2012 Plan, 830,925 shares of the Company’s common stock were initially made available for awards pursuant to the 2012 Plan. On July 31, 2013, the Board of Directors of the Company, upon recommendation of the Compensation Committee, adopted an amendment to the 2012 Plan to increase the number of shares of common stock available for issuance under the 2012 Plan by 700,000 shares. This amendment was approved by a majority of the Company’s stockholders at the Company’s annual meeting of stockholders held on August 28, 2013. Of the Company’s 1,530,925 shares reserved for awards under the 2012 Plan, 543,872 shares were originally underlying a SAR award granted to the Company’s Chief Operating Officer on June 6, 2012 and 162,993 shares of restricted stock have been granted to date to eligible employees (as further described below). As of March 31, 2014, the Company had 824,060 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, 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 (i.e. equity) 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 7, “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. During the year ended December 31, 2013, the Grantee exercised the then vested portion of his SAR.
	In the three months ended March 31, 2014 and 2013, the Company recognized $123,000 and $207,000, respectively, of expense for the SAR granted. As of March 31, 2014, there was $292,000 of total unrecognized compensation expense related to the SAR granted under the 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 fifteen 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”). There were no new restricted shares granted in the three month period ended March 31, 2014. Restricted stock activity consisted of the following for the three months ended March 31, 2014:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-13		162,993	$	39.29
	Granted		—		—
	Forfeited		—		—
	Vested		—		—
	31-Mar-14		162,993	$	39.29
	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, 2014, the Company recognized approximately $198,000 of compensation expense in connection with the Restricted Stock granted under the 2012 Plan. As of March 31, 2014, there was approximately $5,845,000 of total unrecognized compensation expense related to the Restricted Stock granted under the 2012 Plan. The total Restricted Stock expense as of March 31, 2014 is expected to be approximately $6,404,000, and the weighted-average period over which total unrecognized compensation cost is expected to be recognized is approximately 8 years.

Stockholders_equity

Stockholders' equity	3 Months Ended
	Mar. 31, 2014
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. As of March 31, 2014, issued shares and outstanding shares of the Company’s common stock were 11,393,064 and 10,562,139. At December 31, 2013, issued shares and outstanding shares of the Company’s common stock were 11,352,812 and 10,521,887, respectively. 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.
	Underwritten public offering
	On July 16, 2013, the Company closed an underwritten public offering of 2,005,000 shares of its common stock at a price to the public of $35.00 per share. The Company sold 1,050,000 shares of its common stock, and certain selling stockholders sold 955,000 shares of Company common stock in the offering. The proceeds to the Company, net of the underwriter’s fees and expenses, were $34,530,000 before deducting offering expenses of approximately $514,000 paid by the Company. The Company did not receive any proceeds from the sale of the shares by the selling stockholders.
	SAR exercise for shares of Company common stock
	On August 15, 2013, the Grantee exercised the SAR with respect to 181,291 shares of common stock, which was the then vested portion of the SAR. Upon such exercise, the Company initially issued 96,504 shares of the Company’s common stock.
	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, 2014, and December 31, 2013, no shares of Series A Convertible preferred stock of the Company were issued or outstanding.
	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” in the Company’s consolidated statements of operations.
	See Note 7, “Fair value of financial instruments,” for detail describing the valuation approach for the Private Placement Warrants as of March 31, 2014 and 2013.
	During each of the three months ended March 31, 2014 and the three months ended March 31, 2013, a portion of the Private Placement Warrants were exercised, resulting in the issuance of 40,252 shares and 138,334 shares of the Company’s common stock, respectively.
	As of March 31, 2014 and December 31, 2013, 356,590 shares and 396,842 shares of Company common stock, respectively, remained reserved for the exercise of the 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 a warrant issued to Roth Capital Partners, LLC). 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. See Note 12, “Commitments and contingencies,” below.
	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.
	Shelf registration
	The Company filed a universal $150 million 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.

Commitments_and_contingencies

Commitments and contingencies	3 Months Ended
	Mar. 31, 2014
Commitments And Contingencies Disclosure [Abstract]	'
Commitments and contingencies	'
	12. Commitments and contingencies
	The Private Placement Registration Rights Agreement provides, among other things, that if, after a registration statement registering the shares issuable on exercise of the Private Placement Warrants has been declared effective by the SEC, sales cannot be made pursuant to such registration statement for any reason, but excluding any period for which the use of any prospectus included in a registration statement has been suspended if and so long as certain conditions exist (which period may not be for more than 20 consecutive days or for a total of more than 45 days in any 12-month period), then the Company would be required to pay each investor 1.5% of the aggregate amount invested by such investor for each 30-day period (or pro rata for any portion thereof) following the date by which such registration statement was unavailable.
	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 signed an agreement to enter 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, 2014, the production facility was complete and manufacturing has been scheduled to commence during 2014. In connection with this agreement, the Company has committed up to $1.2 million toward the joint venture of which $500,000 had been contributed during 2013.

Related_party_purchase_and_sal

Related party purchase and sale transaction	3 Months Ended
	Mar. 31, 2014
Related Party Transactions [Abstract]	'
Related party purchase and sale transaction	'
	13. Related party purchase and sale transaction
	Thomas Somodi, who previously served as the Company’s Chief Operating Officer and Chief Financial Officer, entered into with The W Group (i) a subscription agreement, dated as of April 16, 2005, as amended by the amendment to the subscription agreement, effective January 1, 2008, and (ii) an employment agreement dated as of April 16, 2005, as amended by the amendment to the employment agreement, effective January 1, 2008. Pursuant to the subscription agreement entered into with Mr. Somodi, Mr. Somodi acquired shares of The W Group which represented 10% of the issued and outstanding shares of common stock of The W Group as of the date of such agreement and immediately prior to the closing of the Reverse Recapitalization, and the subscription agreement provided that, upon any issuance or change in the structure of capital stock, The W Group would make an equitable adjustment to the shares held by Mr. Somodi so that Mr. Somodi would maintain an interest equal to 10% of the fully-diluted capital stock of The W Group. The subscription agreement further provided (i) Mr. Somodi with the right to require The W Group to purchase his shares, and (ii) The W Group with the right to require Mr. Somodi to sell his shares to The W Group, upon The W Group’s achievement of certain thresholds relating to the valuation of The W Group. Also, Mr. Somodi agreed to sell his shares, if requested by The W Group, to a third party in connection with the sale of The W Group.
	On April 28, 2011, Gary Winemaster, Chief Executive Officer, and Mr. Somodi entered into a purchase and sale agreement which was subsequently amended on October 31, 2011, as described below, whereby Mr. Winemaster agreed to purchase all of Mr. Somodi’s shares of preferred and common stock in The W Group, which shares converted into an aggregate of 830,925 shares of Company common stock upon the consummation of the Reverse Recapitalization, as adjusted for the Reverse Split as described in Note 1, “Description of the company and business operations”.
	On October 31, 2011, Mr. Winemaster and Mr. Somodi amended the purchase and sale agreement to provide that Mr. Winemaster would purchase the 830,925 shares of the Company’s common stock then held by Mr. Somodi at an initial closing upon delivery by Mr. Winemaster of $4.25 million, by delivery of a full-recourse promissory note therefore, and to modify the terms upon which Mr. Winemaster was required to transfer shares of the Company’s common stock to Mr. Somodi upon the Company’s achievement of certain common stock value thresholds set forth in the purchase and sale agreement as follows: (a) an aggregate of 112,530 shares of Company common stock within 90 days of such time as the value per share of the Company’s common stock was at least $22.2162; (b) an additional aggregate of 135,036 shares of Company common stock within 90 days of such time as the value per share of the Company’s common stock was at least $27.7717; and (c) an additional aggregate of 90,024 shares of the Company’s common stock within 90 days of such time as the value per share of the Company’s common stock was at least $33.3244. All share and per share numbers in the foregoing provisions were subject to adjustment for stock splits, stock dividends, stock combinations and similar events.
	Messrs. Winemaster and Somodi consummated the sale of the 830,925 shares of Company common stock from Mr. Somodi to Mr. Winemaster pursuant to the terms of the purchase and sale agreement, as amended, on October 31, 2011, and, thereafter on October 31, 2011, pursuant to the terms of a purchase agreement between the Company and Mr. Winemaster, the Company purchased the 830,925 shares of the Company’s common stock from Mr. Winemaster in exchange for delivery by the Company to Mr. Winemaster of $4.25 million, representing a price per share of $5.11. The promissory note delivered by Mr. Winemaster to Mr. Somodi in exchange for the shares at the closing of the transactions contemplated by the purchase and sale agreement, as amended, was paid in full by Mr. Winemaster on October 31, 2011. Promptly following the purchase of the shares by the Company from Mr. Winemaster pursuant to the terms of the purchase agreement, the shares were returned to the Company’s treasury as authorized and issued, but not outstanding, shares of Company common stock.
	Pursuant to the terms of the purchase and sale agreement, as amended, Mr. Winemaster had the right to elect to make a payment to Mr. Somodi equal to the product of the number of shares Mr. Winemaster would otherwise be required to deliver to Mr. Somodi upon achievement of a common stock value threshold, multiplied by the applicable threshold price. The first common stock value threshold was achieved on or about March 27, 2013, the second common stock value threshold was achieved on or about May 7, 2013, and the third common stock value threshold was achieved on or about May 28, 2013. On June 24, 2013, Mr. Somodi transferred to the Company his right to receive shares or a cash payment from Mr. Winemaster as a result of the achievement of the first common stock value threshold, in exchange for a cash payment by the Company to Mr. Somodi of $2.5 million. Mr. Winemaster contemporaneously paid the Company $2.5 million in full satisfaction of Mr. Winemaster’s obligations to the Company as a result of the achievement of the first common stock value threshold. On August 5, 2013, Mr. Somodi again transferred to the Company his right to receive shares or a cash payment from Mr. Winemaster as a result of the achievement of the second common stock value threshold, in exchange for a cash payment by the Company to Mr. Somodi of $3.75 million. Mr. Winemaster contemporaneously paid the Company $3.75 million in full satisfaction of Mr. Winemaster’s obligations to the Company as a result of the achievement of the second common stock value threshold. On August 26, 2013, Mr. Somodi transferred to the Company his right to receive shares or a cash payment from Mr. Winemaster as a result of the achievement of the third common stock value threshold, in exchange for a cash payment by the Company to Mr. Somodi of $3.0 million. Mr. Winemaster contemporaneously paid the Company $3.0 million in full satisfaction of Mr. Winemaster’s obligations to the Company as a result of the achievement of the third common stock value threshold. These transactions were all approved by the Audit Committee prior to being entered into and consummated.

Acquisition_of_Professional_Po

Acquisition of Professional Power Products, Inc.	3 Months Ended
	Mar. 31, 2014
Business Combinations [Abstract]	'
Acquisition of Professional Power Products, Inc.	'
	14. Acquisition of Professional Power Products, Inc.
	On April 1, 2014, the Company acquired Professional Power Products, Inc. (“PPPI”), a leading designer and manufacturer of large, custom engineered integrated electrical power generation systems serving the global diesel and natural gas power generation market. The Company acquired all of the outstanding capital stock of PPPI for an initial cash purchase price of $46 million, plus contingent consideration between $5.0 million and $15.0 million, based upon PPPI’s 2014 operating results. The contingent consideration will be payable in shares of the Company’s common stock, based on a per common share value of $76.02 as determined by the terms of the purchase agreement. The purchase accounting for the acquisition has not been resolved, and therefore, pro-forma information has not been presented.

Basis_of_presentation_Policies

Basis of presentation (Policies)	3 Months Ended
	Mar. 31, 2014
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 generally accepted accounting principles in the U.S. (“GAAP”), have been prepared pursuant to the rules and regulations of the SEC 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.
	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 PSI’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. As these financial statements have been prepared pursuant to the rules and regulations of the SEC, certain information and disclosures normally included in the financial statements and related notes prepared in accordance with GAAP have been condensed or omitted.
Principles of consolidation	'
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2013 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 28, 2014. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2013.
Significant accounting policies	'
	Significant accounting policies
	The Company’s significant accounting policies as of December 31, 2013 are described in the Company’s Annual Report on Form 10-K, filed with the Securities and Exchange Commission on February 28, 2014. There have been no material changes with respect to the Company’s significant accounting policies subsequent to December 31, 2013.
Earnings Per Share	'
	The Company computes earnings (loss) per share by applying the guidance stated in ASC 260, Earnings per Share, to determine the net income (loss) available per share of its common stock.
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 480, Distinguishing Liabilities from Equity, and ASC 815, Derivatives and Hedging.
Compensation - Stock Compensation	'
	ASC 718, Compensation — Stock Compensation, 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.

Earnings_per_share_Tables

Earnings per share (Tables)	3 Months Ended
	Mar. 31, 2014
Earnings Per Share [Abstract]	'
Schedule of Computations of Basic and Diluted Earnings (Loss) Per Share	'
	The computations of basic and diluted earnings (loss) per share for the three months ended March 31, 2014 and 2013, respectively, were as follows:
		Three months ended March 31,
		2014			2013
	Numerator:
	Net income (loss)	$	2,374		$	(2,927	)
	Change in the value of private placement warrants		(233	)		—
		$	2,141		$	(2,927	)
	Denominator:
	Weighted average common shares outstanding-basic		10,542,460			9,100,111
	Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock		512,134			—
	Weighted average common shares outstanding-diluted		11,054,594			9,100,111
	Earnings (loss) per share of common stock – basic and diluted
	Earnings (loss) per share of common stock – basic	$	0.23		$	(0.32	)
	Earnings (loss) per share of common stock – diluted	$	0.19		$	(0.32	)

Inventories_net_Tables

Inventories, net (Tables)	3 Months Ended
	Mar. 31, 2014
Inventory Disclosure [Abstract]	'
Components of Inventory	'
	Inventory consisted of the following as of:
		March 31, 2014		December 31, 2013
	Raw material	$	65,216	$	53,538
	Finished goods		3,532		2,448
	Total	$	68,748	$	55,986

Property_plant_and_equipment_n1

Property, plant and equipment, net (Tables)	3 Months Ended
	Mar. 31, 2014
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, 2014			December 31, 2013
	Land	$	260		$	260
	Buildings and improvements		4,016			4,125
	Office furniture and equipment		2,907			2,723
	Tooling and equipment		9,285			7,595
	Transportation equipment		203			203
	Construction in progress		4,510			4,844
	Property, plant and equipment, at cost		21,181			19,750
	Accumulated depreciation		(6,917	)		(6,646	)
	Property, plant and equipment, net	$	14,264		$	13,104

Fair_value_of_financial_instru1

Fair value of financial instruments (Tables)	3 Months Ended
	Mar. 31, 2014
Fair Value Disclosures [Abstract]	'
Estimated Fair Value of Private Placement Warrants Publicly Traded Stock Pricing Approach	'
	As of March 31, 2014, and December 31, 2013, the Company estimated the fair value of its 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 as of:
		March 31, 2014			December 31, 2013
	Market value of the Company’s common stock	$	75.17		$	75.1
	Exercise price	$	13		$	13
	Risk-free interest rate		0.48	%		0.51	%
	Estimated price volatility		42.5	%		42.5	%
	Contractual term		2.08 years			2.33 years
	Dividend yield		—			—
Financial Liability Measured at Fair Value on Recurring Basis	'
	The following table summarizes fair value measurement by level as of March 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		—			—		$	22,066
	The following table summarizes fair value measurements by level as of December 31, 2013, 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		—			—		$	24,525
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 financial instrument in the three months ended March 31, 2014:
	Balance at December 31, 2013	$	24,525
	Fair value of private placement warrants exercised		(2,226	)
	Change in the value of private placement warrants		(233	)
	Balance at March 31, 2014	$	22,066

2012_Incentive_compensation_pl1

2012 Incentive compensation plan (Tables)	3 Months Ended
	Mar. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]	'
Summary of Restricted Stock Unit Activity	'
	Restricted stock activity consisted of the following for the three months ended March 31, 2014:
		Shares		Weighted Average Grant Date
				Fair Value
	31-Dec-13		162,993	$	39.29
	Granted		—		—
	Forfeited		—		—
	Vested		—		—
	31-Mar-14		162,993	$	39.29

Recovered_Sheet1

Description of the Company and Business Operations - Additional Information (Detail) (Business Segments [Member])	3 Months Ended
	Mar. 31, 2014
	Segment
Business Segments [Member]	'
Description Of Business And Significant Accounting Policies [Line Items]	'
Number of Operating Segments	1

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, 2014	Mar. 31, 2013
Numerator:	'	'
Net income (loss)	$2,374	($2,927)
Change in the value of private placement warrants	-233	'
Net income (loss) Attributable to Parent	$2,141	($2,927)
Common Shares [Member]	'	'
Denominator:	'	'
Weighted average common shares outstanding-basic	10,542,460	9,100,111
Incremental shares from assumed exercise of Private Placement Warrants, SAR and restricted stock	512,134	'
Weighted average common shares outstanding-diluted	11,054,594	9,100,111
Earnings (loss) per share of common stock - basic and diluted	'	'
Earnings (loss) per share of common stock - basic	$0.23	($0.32)
Earnings (loss) per share of common stock - diluted	$0.19	($0.32)

Inventories_Net_Additional_Inf

Inventories, Net - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
Inventory Disclosure [Abstract]	'	'
Inventory reserves	$1,662,000	$1,335,000

Inventories_Net_Components_of_

Inventories, Net - Components of Inventory (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Inventory Net [Abstract]	'	'
Raw material	$65,216	$53,538
Finished goods	3,532	2,448
Total	$68,748	$55,986

Recovered_Sheet2

Property, Plant and Equipment, Net - Components of Property, Plant and Equipment (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Property Plant And Equipment [Abstract]	'	'
Land	$260	$260
Buildings and improvements	4,016	4,125
Office furniture and equipment	2,907	2,723
Tooling and equipment	9,285	7,595
Transportation equipment	203	203
Construction in progress	4,510	4,844
Property, plant and equipment, at cost	21,181	19,750
Accumulated depreciation	-6,917	-6,646
Property, plant and equipment, net	$14,264	$13,104

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	Mar. 31, 2014	Dec. 31, 2013
		Private Placement [Member]	Private Placement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Market value of the Company's common stock	'	$75.17	$75.10
Exercise price	'	13	13
Risk-free interest rate	0.92%	0.48%	0.51%
Estimated price volatility	55.00%	42.50%	42.50%
Contractual term	'	'2 years 29 days	'2 years 3 months 29 days
Dividend yield	'	'	'

Recovered_Sheet4

Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013
			Private Placement Warrants [Member]	Private Placement Warrants [Member]
			Black-Scholes [Member]	Black-Scholes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Warrant sensitivity percentage	'	'	'	10.00%
Estimated fair value	'	'	$2,000,000	'
Private placement warrant (income) expense	($233,000)	$4,846,000	'	'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Financial Liability Measured at Fair Value on Recurring Basis (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private placement warrants liability	$22,066	$24,525
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private placement warrants liability	'	'
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private placement warrants liability	'	'
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Private placement warrants liability	$22,066	$24,525

Fair_Value_of_Financial_Instru3

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, 2014	Mar. 31, 2013
Debt Instrument Fair Value Carrying Value [Abstract]	'	'
Balance beginning	$24,525	'
Fair value of private placement warrants exercised	-2,226	'
Change in the value of private placement warrants	-233	4,846
Balance ending	$22,066	'

Revolving_Line_of_Credit_Addit

Revolving Line of Credit - Additional Information (Detail) (USD $)

Apr. 01, 2014

Mar. 31, 2014

Dec. 31, 2012

Mar. 31, 2014

Jun. 28, 2013

Jun. 28, 2013

Mar. 31, 2014

Mar. 20, 2012

Mar. 20, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 20, 2012

Mar. 31, 2014

Mar. 20, 2012

Mar. 31, 2014

Mar. 20, 2012

Mar. 20, 2012

Mar. 20, 2012

Mar. 20, 2012

Minimum [Member]

Minimum [Member]

Maximum [Member]

Amended Harris Agreement II [Member]

Amended Harris Agreement II [Member]

Amended Harris Agreement II [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

BMO Harris Bank N A prime rate [Member]

Wells Fargo Bank, N.A [Member]

Wells Fargo Bank, N.A [Member]

Minimum [Member]

Maximum [Member]

Term Loan B Debt [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Amended Harris Agreement II [Member]

Amended Harris Agreement II [Member]

Amended Wells Credit Agreement I [Member]

Amended Wells Credit Agreement I [Member]

Minimum [Member]

Maximum [Member]

Minimum [Member]

Maximum [Member]

Line of Credit Facility [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Agreement provides for borrowings under a revolving line of credit

'

'

'

'

$75,000,000

$100,000,000

'

$50,000,000

'

'

'

'

'

'

'

'

'

'

'

Revolving line of credit, scheduled maturity date

'

'

'

'

'

'

20-Mar-17

'

'

'

'

'

'

'

'

'

'

'

'

Line of credit, interest at LIBOR

'

'

'

'

1.50%

2.00%

'

1.75%

2.25%

'

'

1.50%

'

2.00%

'

'

'

'

'

Applicable margin, during the period

'

'

'

'

0.00%

0.50%

'

'

'

'

'

'

'

'

'

0.00%

0.50%

0.00%

0.50%

Liquidity Threshold

'

'

'

'

'

9,375,000

'

7,500,000

'

'

'

'

'

'

'

'

'

'

'

Percent of total credit facility

'

'

'

'

'

12.50%

'

12.50%

'

'

'

'

'

'

'

'

'

'

'

Percentage of revolving unused line fee

'

'

'

'

'

0.25%

0.25%

'

'

0.25%

'

'

'

'

'

'

'

'

'

Line of credit facility covenants maximum debt leverage ratio

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

Line of credit facility covenants minimum fixed charge coverage ratio

'

'

'

1

1

'

'

'

'

'

'

'

1.2

'

'

'

'

'

'

Consecutive days of liquidity threshold

'

'

'

'

'

'60 days

'

'

'

'

'

'

'

'

'

'

'

'

'

Increased line of credit

'

'

'

'

'

'

'

'

'

'

'

'

75,000,000

'

90,000,000

'

'

'

'

Long term borrowings

'

'

'

'

'

'

'

'

'

'

5,000,000

'

'

'

'

'

'

'

'

Amortization period

'

'

'

'

'

'

'

'

'

'36 months

'

'

'

'

'

'

'

'

'

Line of Credit bears interest at BMO Bank's LIBOR rate

'

1.65%

1.67%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Outstanding borrowings under its revolving line of credit

66,600,000

26,000,000

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Remaining outstanding balance

'

159,000

8,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of applicable margin interest rate

'

3.25%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unused and available line of credit balance

$19,300,000

$48,800,000

$47,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]	'	'
Company's annual effective tax rate	37.00%	'
Company's quarterly effective tax rate	34.60%	'
Company's income tax rate excluding impact of income/expense associated with private placement warrants	37.00%	33.50%

Recovered_Sheet5

2012 Incentive Compensation Plan - Additional Information (Detail) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

9 Months Ended

3 Months Ended

3 Months Ended

0 Months Ended

3 Months Ended

3 Months Ended

Jun. 06, 2012

Mar. 31, 2014

Mar. 31, 2013

Sep. 30, 2012

Jun. 30, 2013

Sep. 30, 2012

Dec. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Jul. 31, 2013

Mar. 31, 2014

Mar. 31, 2014

Jun. 06, 2012

Mar. 31, 2014

Mar. 31, 2014

Mar. 31, 2014

Employee Stock Option 2012 [Member]

Minimum [Member]

Maximum [Member]

Stock Compensation Plan [Member]

Stock Compensation Plan [Member]

Stock Compensation Plan [Member]

SAR [Member]

SAR [Member]

Restricted Stock [Member]

Restricted Stock [Member]

Restricted Stock [Member]

2012 Plan [Member]

Chief Operating Officer [Member]

2012 Plan [Member]

Maximum [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock repurchased by the company, shares

'

830,925

'

'

'

'

830,925

'

'

'

830,925

'

'

'

'

'

'

'

Common stock available for issuance

'

'

'

'

'

'

'

'

'

'

'

700,000

'

'

'

'

'

'

Share authorized for stock based compensation

'

'

'

'

'

'

'

'

'

'

'

'

1,530,925

'

'

'

'

'

Number of shares granted to employees

'

0

'

'

'

'

'

'

'

'

'

'

'

'

543,872

162,993

'

'

Common stock available for further issuance

'

'

'

'

'

'

'

'

'

'

'

'

824,060

'

'

'

'

'

Number of shares granted under SAR Award Agreement

543,872

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, market value per share

'

$22.07

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Valuation dates of common stock under SAR award agreement, description

'

'Commenced after the 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%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Discount on valuation of trading activity

'

15.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value of SAR granted

'

'

'

'

'

'

'

'

'

'

'

'

'

$3.31

'

'

'

'

Service period

'

'1 year 9 months 11 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected term to exceed public equivalent value over aggregate exercise price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expenses for the SAR granted

'

123,000

207,000

211,000

'

267,000

'

'

'

'

'

'

'

'

'

'

'

'

Total unrecognized compensation expense

'

292,000

'

'

'

'

'

'

'

'

'

'

'

'

'

6,404,000

5,845,000

'

Total expected expense

'

1,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Expected period of recognition of cost

'

'15 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'8 years

'

'

Compensation expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$198,000

'

'

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.

'

'

'

'

'

'

'

'

'

'

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, 2014
Restricted Stock [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Beginning balance, shares	162,993
Granted, shares	'
Forfeited, shares	'
Vested, shares	'
Ending balance, shares	162,993
Weighted average grant date fair value, beginning balance	$39.29
Granted, weighted average grant date fair value	'
Forfeited, weighted average grant date fair value	'
Vested, weighted average grant date fair value	'
Weighted average grant date fair value, ending balance	$39.29

Stockholders_Equity_Additional

Stockholders Equity - Additional Information (Detail) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Aug. 15, 2013	Mar. 31, 2014	Dec. 31, 2013	Feb. 14, 2014	Jul. 16, 2013	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
			SAR [Member]	Private Placement [Member]	Private Placement [Member]	Shelf Registration [Member]	Underwritten Public Offering [Member]	Private Placement Warrants [Member]	Private Placement Warrants [Member]	Private Placement Warrants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'	'	'	'	'	'	'
Public offering shares	'	'	'	'	'	'	2,005,000	'	'	'
Underwritten public offering Price per share	'	'	'	$75.17	$75.10	'	$35	'	'	'
Shares sold through Public offering	'	'	'	'	'	'	1,050,000	'	'	'
Share sold by stockholders through public offering	'	'	'	'	'	'	955,000	'	'	'
Proceeds to the company from Public offering	'	'	'	'	'	'	$34,530,000	'	'	'
Public offering expense	'	'	'	'	'	'	514,000	'	'	'
Common stock exercise price	$0.00	$0.00	'	'	'	'	'	$13	'	'
Common stock, shares authorized	50,000,000	50,000,000	'	'	'	'	'	'	'	'
Common stock, shares issued	11,393,064	11,352,812	'	'	'	'	'	'	'	'
Common stock, shares outstanding	10,562,139	10,521,887	'	'	'	'	'	'	'	'
Shares of common stock issuable upon exercise of the private placement warrant	'	'	'	'	'	'	'	750,002	'	'
Shares issued for warrants exercised	'	'	'	'	'	'	'	40,252	138,334	'
Warrants expiry date	'	'	'	29-Apr-16	'	'	'	'	'	'
Common stock reserved for the exercise of the Private Placement Warrants	'	'	'	'	'	'	'	356,590	'	396,842
Grantee exercised Stock appreciation right	'	'	181,291	'	'	'	'	'	'	'
Common stock new issued to meet Stock appreciation right exercise	'	'	96,504	'	'	'	'	'	'	'
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	'	'	'	'	'	'	'	'
Aggregate offering value	'	'	'	'	'	$150,000,000	'	'	'	'

Commitments_and_Contingencies_

Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Jul. 05, 2013	Mar. 31, 2014
Commitment And Contingencies [Line Items]	'	'
Commitment towards investments in joint venture	'	$1,200,000
Contribution to joint venture	$500,000	'
Private Placement [Member]	'	'
Commitment And Contingencies [Line Items]	'	'
Registration Rights Agreement filing description	'	'The Private Placement Registration Rights Agreement provides, among other things, that if, after such registration statement has been declared effective by the SEC, sales cannot be made pursuant to such registration statement for any reason, but excluding any period for which the use of any prospectus included in a registration statement has been suspended if and so long as certain conditions exist (which period may not be for more than 20 consecutive days or for a total of more than 45 days in any 12-month period), then the Company is required to pay amounts representing liquidated damages to each of the investors, on the same basis as the liquidated damages the Company could have been required to pay in connection with the initial registration statement filed pursuant to the Private Placement Registration Rights Agreement.
Number of consecutive days for suspension of registration statement	'	'20 days
Aggregated number of days, in which conditions regarding suspension persist	'	'45 days
Number of months as base period for aggregate and consecutive period	'	'12 months
Percentage of aggregate amount payable to investors	'	1.50%
Eligible period to use a registration statement	'	'30 days

Recovered_Sheet7

Related Party Purchase and Sale Transactions - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended							3 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Aug. 26, 2013	Aug. 05, 2013	Mar. 31, 2014	Dec. 31, 2013	Oct. 31, 2011	Oct. 31, 2011	Oct. 31, 2011	Oct. 31, 2011	Oct. 31, 2011	Mar. 31, 2014	Oct. 31, 2011
					Purchase And Sale Agreement [Member]	Purchase And Sale Agreement [Member]	Purchase And Sale Agreement [Member]	Purchase And Sale Agreement [Member]	Chief Executive Officer [Member]	Chief Executive Officer [Member]	Stock Purchase Agreement [Member]
						Agreement One [Member]	Agreement Two [Member]	Restricted Stock [Member]		Convertible Debt Securities [Member]
Related Party Transaction [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Subscription agreement effective date as of April 16, 2005	'	'	'	'	'	'	'	'	'	1-Jan-08	'
Employment agreement effective date as of April 16, 2006	'	'	'	'	'	'	'	'	'	1-Jan-08	'
Percent of common stock represent by related party	'	'	'	'	'	'	'	'	'	10.00%	'
Percent of equity interest by related party	'	'	'	'	'	'	'	'	'	10.00%	'
Preferred stock converted to common stock upon the consummation of the reverse split	'	'	'	'	'	'	'	'	830,925	'	'
Cash payments for share transfer	'	'	'	'	$4.25	'	'	'	'	'	'
Sale of common stock to third party under condition A	'	'	11,393,064	11,352,812	'	112,530	135,036	90,024	'	'	'
Par value of common stock to third party under condition A	'	'	$0.00	$0.00	'	$22.22	$27.77	$33.32	'	'	'
Common stock repurchased by the company, per share value	'	'	'	'	'	'	'	'	'	'	$5.11
Cash payments to third party	3	3.75	2.5	'	'	'	'	'	'	'	'
Cash payment from related party	$3	$3.75	$2.50	'	'	'	'	'	'	'	'

Acquisition_of_Professional_Po1

Acquisition of Professional Power Products, Inc - Additional Information (Detail) (USD $)	3 Months Ended	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Mar. 31, 2014	Apr. 01, 2014	Apr. 01, 2014	Apr. 01, 2014
		Subsequent Event [Member]	Minimum [Member]	Maximum [Member]
		Professional Power Products Inc (PPPI) [Member]	Subsequent Event [Member]	Subsequent Event [Member]
			Professional Power Products Inc (PPPI) [Member]	Professional Power Products Inc (PPPI) [Member]
Business Acquisition [Line Items]	'	'	'	'
Business acquisition agreement date	1-Apr-14	'	'	'
Initial cash purchase price	'	$46	'	'
Contingent consideration payable in common stock	'	'	$5	$15
Common stock issued to seller, price per share	'	$76.02	'	'