Stockholders' equity	12 Months Ended
Dec. 31, 2015
Equity [Abstract]
Stockholders' equity	11. Stockholders’ equity The statements of changes in stockholders’ equity for the years ended December 31, 2015, 2014 and 2013, present the changes giving effect to the Company’s common stock issued, stock compensation activity and Private Placement Warrant exercises, each of which is described below. *Common stock* The Company has authorized 50,000,000 shares of common stock with a par value of $0.001 per share. At December 31, 2015, 11,583,831 shares of Company common stock were issued and 10,752,906 shares of Company’s common stock were outstanding. At December 31, 2014, 11,562,209 shares of Company common stock were issued and 10,731,284 shares of Company’s common stock were outstanding. Each holder of a share of the Company’s common stock is entitled to one vote per share held on each matter to be considered by holders of the Company’s common stock. Holders of the Company’s common stock are entitled to receive ratably such dividends, if any, as may be declared by the Company’s board of directors. The Company’s current policy is to retain earnings for operations and growth. Upon any liquidation, dissolution or winding-up of the Company, the holders of the Company’s common stock are entitled to share ratably in all assets available for distribution, after payment of, or provision for, all liabilities and the preferences of any then outstanding shares of Company preferred stock. The holders of the Company’s common stock have no preemptive, subscription, redemption or conversion rights. *Series A Convertible preferred stock* The Company has authorized 114,000 shares of Series A Convertible preferred stock with a par value of $0.001 per share. At December 31, 2015 and 2014, no shares of Series A Convertible preferred stock of the Company were issued or outstanding. *SAR exercise for shares of Company common stock* During the year ended December 31, 2014, 120,000 of the 181,291 shares of common stock underlying SAR I which vested on June 6, 2014, were exercised in two tranches. As a result of these exercises the Company issued a total of 85,903 shares of the Company’s common stock. In connection with these exercises, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements resulted in an amount that was deductible for income tax purposes. As such, the Company realized an income tax benefit of $2,427,000 for this incremental amount, which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital during the year ended December 31, 2014. As of December 31, 2014, there were 61,291 unexercised shares under the SAR that vested on June 6, 2014. On August 15, 2013, 181,291 shares of common stock underlying SAR I, which vested on June 6, 2013 were exercised. Upon such exercise, the Company initially issued 96,504 shares of the Company’s common stock. Under the terms of the plan, at the option of the recipient, the Company then withheld 42,314 of the shares issued to satisfy the recipient’s income tax obligations. The cash equivalent of the shares withheld was $2,063,000, representing the recipient’s income tax withholding obligation that was remitted by the Company to the applicable taxing authorities. The payment of the income tax withholding obligation was recorded as a reduction in additional paid-in-capital during the year ended December 31, 2013. The Company realized an income tax benefit of $1,642,000 for the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements that was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital during the year ended December 31, 2013. *Restricted stock vesting for shares of Company common stock* For the years ended December 31, 2015 and 2014, various individuals vested in shares of the Company’s common stock under the Restricted Stock Award Agreement resulting in the net issuance of 16,622 shares and 13,909 shares, respectively. Under the terms of the 2012 Plan, at the option of certain of those vested restricted stock participants, the Company withheld shares issued to satisfy the income tax obligations of these recipients. The cash equivalent of the aggregate number of shares withheld was $351,000 and $430,000 for the years ended December 31, 2015 and 2014, respectively, representing the income tax withholding obligations of the recipients, and such amounts were remitted by the Company to the applicable taxing authorities. The payments of the income tax withholding obligations were recorded as a reduction in additional paid-in-capital as of December 31, 2015 and 2014. In connection with the vesting and issuance of shares of the Company’s common stock under the 2012 Plan, other than the shares of common stock issued in connection with the SAR, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements resulted in costs that are deductible for income tax purposes. As such, the Company realized an income tax benefit of $65,000 and $277,000 for this incremental amount which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital as of and for the years ended December 31, 2015 and 2014, respectively. *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 (income) expense” in the Company’s consolidated statements of operations. The Company was formerly known as Format, Inc. (“Format”). 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 Private Placement Warrants issued had an estimated fair value of $2,887,000 at the closing of the Reverse Recapitalization transaction and the Private Placement on April 29, 2011, determined based upon an agreed-upon exercise price of the Private Placement Warrants; the purchase price for (value of) the Company’s preferred stock and Private Placement Warrants, in the aggregate as agreed upon with the investors in the Private Placement; an assessment of an appropriate risk-free interest rate of 2.1%, an anticipated volatility factor of 50.0%, and a zero percent dividend yield, all incorporated into a valuation using the Black-Scholes option pricing model. The Company determined that the five-year Treasury Bond yield was a reasonable assumption for a risk-free rate, and that an appropriate volatility rate would represent the upper end of the range of implied volatility of publicly traded call options of benchmark companies, which reflects the mid-range of their historical volatility. The Company’s past history of not paying dividends and management’s intentions to continue such a dividend policy resulted in a zero dividend yield assumption. The five-year term of the Private Placement Warrants, the stated warrant exercise price of $13.00 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, and the Company’s common stock valuation of $10.08 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, comprise the balance of the inputs into the Black-Scholes pricing model for the warrant valuation. See Note 7, “Fair value of financial instruments,” for detail describing the valuation approach for the Private Placement Warrants. During the years ended December 31, 2015, 2014 and 2013, portions of the Private Placement Warrants were exercised, resulting in the issuance of 5,000 shares, 109,585 shares and 339,410 shares of Company common stock, respectively. As of December 31, 2015 and 2014, 282,257 shares and 287,257 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. *Treasury stock* The Company and Gary S. Winemaster, the Company’s Chief Executive Officer and President, and Chairman of the Board of Directors of the Company, entered into a Stock Purchase Agreement, pursuant to which, on October 31, 2011, the Company purchased from Mr. Winemaster 830,925 shares of Company common stock for $4.25 million, or $5.11 per share. These shares were returned to the Company’s treasury as authorized and issued, but not outstanding, shares of common stock of the Company. *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 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. *Registration rights agreement* In connection with the Private Placement, the Company entered into a Registration Rights Agreement (the “Private Placement Registration Rights Agreement”) with the investors in the Private Placement and Roth Capital Partners, LLC, pursuant to which it agreed to file a registration statement on Form S-1, with the SEC, covering the resale of “Registrable Securities” (as defined below) (which includes the shares of the Company’s common stock that were issuable upon conversion of shares of the Company’s preferred stock originally issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and shares of the Company’s common stock that were issuable upon exercise of the Roth Warrant), on or before the date which is 30 days after the closing date of the Private Placement, and to use its commercially reasonable efforts to have such registration statement declared effective by the SEC as soon as practicable. The Company further agreed, within 30 days after it becomes eligible to use a registration statement on Form S-3 to register the Registrable Securities for resale, to file a registration statement on Form S-3 covering the Registrable Securities. On June 27, 2013, within 30 days after the Company became eligible to use a registration statement on Form S-3, in accordance with the Private Placement Registration Rights Agreement, it filed a registration statement on Form S-3 (as a post-effective amendment to the registration statement on Form S-1) covering the Registrable Securities, which was declared effective on June 27, 2013. The Company is obligated to maintain the effectiveness of the registration statement until the earliest of (1) the first date on which all Registrable Securities covered by such registration statement have been sold, (2) the first date on which all Registrable Securities covered by such registration statement may be sold without restriction pursuant to Rule 144 or (3) the first date on which none of the securities included in the registration statement constitute Registrable Securities. Pursuant to the Private Placement Registration Rights Agreement, the holders of Registrable Securities are also entitled to certain piggyback registration rights if the Registrable Securities are not covered by one or more effective registration statements. As of December 31, 2013, and as of the time of the closing of the public offering on July 16, 2013, all of the Registrable Securities were covered by an effective registration statement. “Registrable Securities,” as contemplated by the Private Placement Registration Rights Agreement, means certain shares of the Company’s common stock, including those shares that were issuable upon conversion of shares of Company preferred stock issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and the shares of the Company’s common stock that were issued upon exercise of the Roth Warrant; provided, that, any such share shall cease to be a Registrable Security upon (A) sale pursuant to the registration statement or Rule 144 under the Securities Act, (B) such share becoming eligible for sale without restriction by the selling securityholder holding such security pursuant to Rule 144 under the Securities Act or (C) such share otherwise becoming eligible for sale without restriction pursuant to Section 4(1) of the Securities Act, provided that, any restrictive legend on any certificate or other instrument representing such shares has been removed or there has been delivered to the transfer agent for such shares irrevocable documentation (including any necessary legal opinion) to the effect that, upon submission by the applicable selling securityholder of the certificate or instrument representing such security, any such restrictive legend shall be removed. In connection with the consummation of the Reverse Recapitalization, the Company also entered into a registration rights agreement with the former stockholders of The W Group, Inc., 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. *Universal shelf registration* The Company has a universal shelf registration pursuant to which the Company may offer, issue and sell, from time to time, in one or more offerings, up to $150,000,000 of common stock, preferred stock, debt securities, depositary shares, warrants, subscription rights, stock purchase contracts and units: and certain selling stockholders may offer and sell, from time to time, in one or more offerings, up to 500,000 shares of common stock.

11. Stockholders’ equity

The statements of changes in stockholders’ equity for the years ended December 31, 2015, 2014 and 2013, present the changes giving effect to the Company’s common stock issued, stock compensation activity and Private Placement Warrant exercises, each of which is described below.

Common stock

The Company has authorized 50,000,000 shares of common stock with a par value of $0.001 per share. At December 31, 2015, 11,583,831 shares of Company common stock were issued and 10,752,906 shares of Company’s common stock were outstanding. At December 31, 2014, 11,562,209 shares of Company common stock were issued and 10,731,284 shares of Company’s common stock were outstanding. Each holder of a share of the Company’s common stock is entitled to one vote per share held on each matter to be considered by holders of the Company’s common stock. Holders of the Company’s common stock are entitled to receive ratably such dividends, if any, as may be declared by the Company’s board of directors. The Company’s current policy is to retain earnings for operations and growth. Upon any liquidation, dissolution or winding-up of the Company, the holders of the Company’s common stock are entitled to share ratably in all assets available for distribution, after payment of, or provision for, all liabilities and the preferences of any then outstanding shares of Company preferred stock. The holders of the Company’s common stock have no preemptive, subscription, redemption or conversion rights.

Series A Convertible preferred stock

The Company has authorized 114,000 shares of Series A Convertible preferred stock with a par value of $0.001 per share. At December 31, 2015 and 2014, no shares of Series A Convertible preferred stock of the Company were issued or outstanding.

SAR exercise for shares of Company common stock

During the year ended December 31, 2014, 120,000 of the 181,291 shares of common stock underlying SAR I which vested on June 6, 2014, were exercised in two tranches. As a result of these exercises the Company issued a total of 85,903 shares of the Company’s common stock. In connection with these exercises, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements resulted in an amount that was deductible for income tax purposes. As such, the Company realized an income tax benefit of $2,427,000 for this incremental amount, which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital during the year ended December 31, 2014. As of December 31, 2014, there were 61,291 unexercised shares under the SAR that vested on June 6, 2014.

On August 15, 2013, 181,291 shares of common stock underlying SAR I, which vested on June 6, 2013 were exercised. Upon such exercise, the Company initially issued 96,504 shares of the Company’s common stock. Under the terms of the plan, at the option of the recipient, the Company then withheld 42,314 of the shares issued to satisfy the recipient’s income tax obligations. The cash equivalent of the shares withheld was $2,063,000, representing the recipient’s income tax withholding obligation that was remitted by the Company to the applicable taxing authorities. The payment of the income tax withholding obligation was recorded as a reduction in additional paid-in-capital during the year ended December 31, 2013. The Company realized an income tax benefit of $1,642,000 for the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements that was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital during the year ended December 31, 2013.

Restricted stock vesting for shares of Company common stock

For the years ended December 31, 2015 and 2014, various individuals vested in shares of the Company’s common stock under the Restricted Stock Award Agreement resulting in the net issuance of 16,622 shares and 13,909 shares, respectively. Under the terms of the 2012 Plan, at the option of certain of those vested restricted stock participants, the Company withheld shares issued to satisfy the income tax obligations of these recipients. The cash equivalent of the aggregate number of shares withheld was $351,000 and $430,000 for the years ended December 31, 2015 and 2014, respectively, representing the income tax withholding obligations of the recipients, and such amounts were remitted by the Company to the applicable taxing authorities. The payments of the income tax withholding obligations were recorded as a reduction in additional paid-in-capital as of December 31, 2015 and 2014.

In connection with the vesting and issuance of shares of the Company’s common stock under the 2012 Plan, other than the shares of common stock issued in connection with the SAR, the excess of the underlying value of the common stock issued over the amount recognized as compensation expense in the Company’s financial statements resulted in costs that are deductible for income tax purposes. As such, the Company realized an income tax benefit of $65,000 and $277,000 for this incremental amount which was recorded as a reduction in the Company’s income tax liability and an increase in additional paid-in-capital as of and for the years ended December 31, 2015 and 2014, respectively.

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 (income) expense” in the Company’s consolidated statements of operations.

The Company was formerly known as Format, Inc. (“Format”). 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 Private Placement Warrants issued had an estimated fair value of $2,887,000 at the closing of the Reverse Recapitalization transaction and the Private Placement on April 29, 2011, determined based upon an agreed-upon exercise price of the Private Placement Warrants; the purchase price for (value of) the Company’s preferred stock and Private Placement Warrants, in the aggregate as agreed upon with the investors in the Private Placement; an assessment of an appropriate risk-free interest rate of 2.1%, an anticipated volatility factor of 50.0%, and a zero percent dividend yield, all incorporated into a valuation using the Black-Scholes option pricing model. The Company determined that the five-year Treasury Bond yield was a reasonable assumption for a risk-free rate, and that an appropriate volatility rate would represent the upper end of the range of implied volatility of publicly traded call options of benchmark companies, which reflects the mid-range of their historical volatility. The Company’s past history of not paying dividends and management’s intentions to continue such a dividend policy resulted in a zero dividend yield assumption. The five-year term of the Private Placement Warrants, the stated warrant exercise price of $13.00 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, and the Company’s common stock valuation of $10.08 per share (as adjusted for a reverse split), when the Private Placement Warrants became exercisable, comprise the balance of the inputs into the Black-Scholes pricing model for the warrant valuation.

See Note 7, “Fair value of financial instruments,” for detail describing the valuation approach for the Private Placement Warrants.

During the years ended December 31, 2015, 2014 and 2013, portions of the Private Placement Warrants were exercised, resulting in the issuance of 5,000 shares, 109,585 shares and 339,410 shares of Company common stock, respectively.

As of December 31, 2015 and 2014, 282,257 shares and 287,257 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.

Treasury stock

The Company and Gary S. Winemaster, the Company’s Chief Executive Officer and President, and Chairman of the Board of Directors of the Company, entered into a Stock Purchase Agreement, pursuant to which, on October 31, 2011, the Company purchased from Mr. Winemaster 830,925 shares of Company common stock for $4.25 million, or $5.11 per share. These shares were returned to the Company’s treasury as authorized and issued, but not outstanding, shares of common stock of the Company.

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 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.

Registration rights agreement

In connection with the Private Placement, the Company entered into a Registration Rights Agreement (the “Private Placement Registration Rights Agreement”) with the investors in the Private Placement and Roth Capital Partners, LLC, pursuant to which it agreed to file a registration statement on Form S-1, with the SEC, covering the resale of “Registrable Securities” (as defined below) (which includes the shares of the Company’s common stock that were issuable upon conversion of shares of the Company’s preferred stock originally issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and shares of the Company’s common stock that were issuable upon exercise of the Roth Warrant), on or before the date which is 30 days after the closing date of the Private Placement, and to use its commercially reasonable efforts to have such registration statement declared effective by the SEC as soon as practicable. The Company further agreed, within 30 days after it becomes eligible to use a registration statement on Form S-3 to register the Registrable Securities for resale, to file a registration statement on Form S-3 covering the Registrable Securities. On June 27, 2013, within 30 days after the Company became eligible to use a registration statement on Form S-3, in accordance with the Private Placement Registration Rights Agreement, it filed a registration statement on Form S-3 (as a post-effective amendment to the registration statement on Form S-1) covering the Registrable Securities, which was declared effective on June 27, 2013.

The Company is obligated to maintain the effectiveness of the registration statement until the earliest of (1) the first date on which all Registrable Securities covered by such registration statement have been sold, (2) the first date on which all Registrable Securities covered by such registration statement may be sold without restriction pursuant to Rule 144 or (3) the first date on which none of the securities included in the registration statement constitute Registrable Securities.

Pursuant to the Private Placement Registration Rights Agreement, the holders of Registrable Securities are also entitled to certain piggyback registration rights if the Registrable Securities are not covered by one or more effective registration statements. As of December 31, 2013, and as of the time of the closing of the public offering on July 16, 2013, all of the Registrable Securities were covered by an effective registration statement. “Registrable Securities,” as contemplated by the Private Placement Registration Rights Agreement, means certain shares of the Company’s common stock, including those shares that were issuable upon conversion of shares of Company preferred stock issued in the Private Placement and shares of the Company’s common stock issuable upon exercise of the Private Placement Warrants and the shares of the Company’s common stock that were issued upon exercise of the Roth Warrant; provided, that, any such share shall cease to be a Registrable Security upon (A) sale pursuant to the registration statement or Rule 144 under the Securities Act, (B) such share becoming eligible for sale without restriction by the selling securityholder holding such security pursuant to Rule 144 under the Securities Act or (C) such share otherwise becoming eligible for sale without restriction pursuant to Section 4(1) of the Securities Act, provided that, any restrictive legend on any certificate or other instrument representing such shares has been removed or there has been delivered to the transfer agent for such shares irrevocable documentation (including any necessary legal opinion) to the effect that, upon submission by the applicable selling securityholder of the certificate or instrument representing such security, any such restrictive legend shall be removed.

In connection with the consummation of the Reverse Recapitalization, the Company also entered into a registration rights agreement with the former stockholders of The W Group, Inc., 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.

Universal shelf registration

The Company has a universal shelf registration pursuant to which the Company may offer, issue and sell, from time to time, in one or more offerings, up to $150,000,000 of common stock, preferred stock, debt securities, depositary shares, warrants, subscription rights, stock purchase contracts and units: and certain selling stockholders may offer and sell, from time to time, in one or more offerings, up to 500,000 shares of common stock.