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Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2013
Debt Disclosure [Abstract] |
Schedule of Debt [Table Text Block] |
|  |  |  | December 31, |
|  |  |  | 2013 |  | 2012 |
1) |  | The Company entered into the Texas Emerging Technology Fund (the “ETF”) Award and Security Agreement (the “Agreement”) with the State of Texas (the “State”) on October 1, 2010 subsequently amended on May 20, 2011, April 16, 2013 and December 27, 2013. Under the Agreement, the Company received an initial award totaling $250,000 during the year ended December 31, 2010 and received an additional award totaling $750,000 during the year ended December 31, 2011 (collectively, the “Promissory Note”). The proceeds from the award had to be used to expedite commercialization intended to increase high-quality jobs in Texas through expenditures on working capital or development or acquisition of capital assets used to produce income and in meeting the Company’s goal of introducing a 30KW solar inverter to the market. The Company was also required to meet certain milestones by specific dates, use Texas-based suppliers and establish a substantial percentage of its commercialization and manufacturing activities in Texas. The awards were collateralized by all owned or acquired assets of the Company. The ETF, in a subordination agreement dated August 30, 2012, agreed to subordinate the Promissory Note to secured convertible promissory notes to be issued by the Company of up to $5,000,000. At December 31, 2012 the Company had secured convertible promissory notes aggregating $4,000,000. See 4) and 5) below. |  |  |  |  |  |  |
|  | The Promissory Note accrued interest at an annual rate of 8% and could have been repaid at the option of the Company after April 1, 2012. On December 31, 2013, in connection with the State’s exercise of warrants under the Agreement, the Promissory Note was cancelled and the Agreement terminated. At that time, the debt, including accrued interest, was forgiven and the Company was released from all obligations under the Agreement. The Company accounted for the cancellation of the Promissory Note as a contribution of equity. |  |  |  |  |  |  |
|  | In connection with the Promissory Note, in October 2010 and July 2011, the Company issued warrants to purchase shares of the Company’s common stock. The fair value of the warrants was estimated to be $265,476, subsequently adjusted to $669,476 in 2013, and was recorded as debt discount. During the years ended December 31, 2013 and 2012, the Company incurred interest expense amounting to $404,000 and $77,430, respectively, related to the accretion of the debt discount. Interest on the Promissory Note, including accretion of debt discount, amounted to $476,406 and $157,430 for the years ended December 31, 2013 and 2012, respectively. Effective interest rate on this Promissory Note was 48% and 16% per annum for the years ended December 31, 2013 and 2012, respectively. Accrued interest amounted to $132,690 at December 31, 2012 and was included in the outstanding amount of Promissory Note. |  | $ | — |  | $ | 1,132,690 |
2) |  | Unsecured convertible promissory notes with principal and interest due at maturity at 6% per annum, subordinate to the line of credit, and maturing on the earlier of: 1) December 31, 2013, or 2) closing of initial public offering of the Company’s common stock in which the Company raises at least $10 million, or 3) closing of qualified financing, as defined in the promissory notes, or 4) occurrence of event of default, as defined in the promissory notes. The promissory notes converted into 82,079 shares of the Company’s common stock immediately following the closing of the Company’s initial public offering. The embedded beneficial conversion feature associated with these convertible promissory notes had no intrinsic value. Interest on these notes amounted to $19,588 and $21,600 for the years ended December 31, 2013 and 2012, respectively. |  |  | — |  |  | 360,000 |
3) |  | Unsecured convertible promissory notes aggregating $695,150 with principal and interest due at maturity at 6% per annum and maturing on the earlier of: 1) December 31, 2013, or 2) closing of initial public offering of the Company’s common stock in which the Company raises at least $10 million, or 3) closing of qualified financing, as defined in the promissory notes, or 4) occurrence of event of default, as defined in the promissory notes. The promissory notes converted into 152,256 shares of the Company’s common stock immediately upon completion of the Company’s initial public offering. The embedded beneficial conversion feature associated with these convertible promissory notes had no intrinsic value. |  |  |  |  |  |  |
|  | In connection with these promissory notes, the Company issued warrants to purchase 109,860 shares of the Company’s common stock. The fair value of the warrants was determined to be $419,840 and was recorded as debt discount. During the years ended December 31, 2013 and 2012, the Company incurred interest expense amounting to $262,129 and$157,711, respectively, related to the accretion of the debt discount. Interest on these promissory notes, including accretion of debt discount, amounted to $299,953 and $185,874, respectively, for the years ended December 31, 2013 and 2012. Unamortized debt discount amounted to $0 and $262,129, respectively, at December 31, 2013 and 2012. Effective interest rate on these notes was 48% and 35%, respectively, per annum for the years ended December 31, 2013 and 2012. |  |  | — |  |  | 433,021 |
4) |  | Convertible promissory notes aggregating $750,000 secured by substantially all assets of the Company with principal and interest due at maturity at the higher of: a) 1% per annum or b) at the lowest rate that may accrue without causing the imputation of interest under the Internal Revenue Code, and maturing on the earlier of: 1) January 6, 2014, 2) event of default, as defined in the agreement, or 3) the closing of an initial public offering of the Company’s common stock. The promissory notes converted into 218,463 shares of the Company’s common stock immediately upon completion of the Company’s initial public offering. The intrinsic value of embedded beneficial conversion feature associated with these convertible promissory notes was determined to be $321,429 and was recorded as debt discount. |  |  |  |  |  |  |
|  | In connection with these promissory notes, the Company issued warrants to purchase 215,749 shares of the Company’s common stock. The fair value of the warrants was determined to be $754,264 and was recorded as debt discount. |  |  |  |  |  |  |
|  | During the years ended December 31, 2013 and 2012, the Company incurred interest expense amounting to $554,418 and $521,275, respectively, related to the accretion of the debt discount. Interest on these promissory notes, including accretion of debt discount, amounted to $561,314 and $523,796, respectively, for the years ended December 31, 2013 and 2012. Unamortized debt discount amounted to $0 and $550,000, respectively, at December 31, 2013 and 2012. Effective interest rate on these notes was 83% and 210%, respectively, per annum for the years ended December 31, 2013 and 2012. |  |  | — |  |  | 200,000 |
5) |  | Convertible promissory notes aggregating $3,250,000 secured by substantially all assets of the Company with principal and interest due at maturity at the higher of: a) 1% per annum or b) at the lowest rate that may accrue without causing the imputation of interest under the Internal Revenue Code, and maturing on the earlier of: 1) January 6, 2014, 2) event of default, as defined in the agreement, or 3) the closing of an initial public offering of the Company’s common stock. The promissory notes converted into 944,564 shares of the Company’s common stock immediately upon completion of the Company’s initial public offering. The intrinsic value of the embedded beneficial conversion feature associated with these convertible promissory notes was determined to be $1,402,397 and was recorded as debt discount. |  |  |  |  |  |  |
|  | In connection with these promissory notes, the Company issued warrants to purchase 467,456 shares of the Company’s common stock. The fair value of the warrants was determined to be $1,634,794 and was recorded as debt discount. |  |  |  |  |  |  |
|  | In connection with these promissory notes the Company issued underwriter warrants to purchase 93,491 shares of the Company’s common stock. The fair value of the warrants was determined to be $299,981 and was recorded as debt discount. The Company also incurred debt raising cost of $375,000 in connection with these promissory notes which was recorded as debt discount. |  |  |  |  |  |  |
|  | During the years ended December 31, 2013 and 2012, the Company incurred interest expense amounting to $2,995,685 and $716,488, respectively, related to the accretion of the debt discount. Interest expense on these promissory notes, including accretion of debt discount, amounted to $3,025,791 and $720,099, respectively, for the years ended December 31, 2013 and 2012. Unamortized debt discount amounted to $0 and $2,979,167, respectively, at December 31, 2013 and 2012. The effective interest rate on these notes was 103% and 133%, respectively, per annum for the years ended December 31, 2013 and 2012. |  |  | — |  |  | 270,833 |
6) |  | Unsecured convertible promissory note amounting to $86,707 with principal and interest due at maturity at the higher of: a) 1% per annum or b) at the lowest rate that may accrue without causing the imputation of interest under the Internal Revenue Code, and maturing on the earlier of: 1) December 31, 2013, 2) event of default, as defined in the agreement, or 3) the closing of an initial public offering of the Company’s common stock. The promissory note converted into 25,172 shares of the Company’s common stock immediately upon completion of the Company’s initial public offering. The intrinsic value of embedded beneficial conversion feature associated with these convertible promissory notes was determined to be $37,415 and was recorded as debt discount. |  |  |  |  |  |  |
|  | During the years ended December 31, 2013 and 2012, the Company incurred interest expense amounting to $37,415 and $0, respectively, related to the accretion of the debt discount. Interest expense, including accretion of the debt discount, amounted to $38,212 and $0, respectively, for the years ended December 31, 2013 and 2012. Unamortized debt discount amounted to $0 and $37,415, respectively, at December 31, 2013 and 2012. The effective interest rate on these notes was 49% and 0%, respectively, for the years ended December 31, 2013 and 2012. |  |  | — |  |  | 49,292 |
7) |  | Convertible promissory notes aggregating $750,000 secured by substantially all assets of the Company with principal and interest due at maturity at the higher of: a) 1% per annum or b) at the lowest rate that may accrue without causing the imputation of interest under the Internal Revenue Code, and maturing on the earlier of: 1) July 29, 2014, 2) event of default, as defined in the agreement, or 3) the closing of an initial public offering of the Company’s common stock, at which time the notes would mandatorily convert into shares of the Company’s common stock. The promissory notes converted into 216,474 shares of the Company’s common stock immediately upon the completion of the Company’s initial public offering. The intrinsic value of the embedded beneficial conversion feature associated with these convertible promissory notes was determined to be $580,568 and was recorded as a debt discount. |  |  |  |  |  |  |
|  | In connection with these promissory notes, the Company issued warrants to purchase 107,875 shares of the Company’s common stock. The fair value of the warrants was determined to be $251,800 and was recorded as a debt discount. The Company also incurred debt raising cost of $138,744 in connection with these promissory notes which was recorded as a debt discount. The Company immediately recorded a charge to interest expense of $221,112 to write-off the excess of the debt discount over the principal amount of the notes. |  |  |  |  |  |  |
|  | During the year ended December 31, 2013, the Company incurred interest expense amounting to $971,112 related to the accretion of the debt discount. Interest expense, including accretion of the debt discount, amounted to $973,633 for the year ended December 31, 2013. The effective interest rate was 392% per annum for the year ended December 31, 2013. |  |  | — |  |  | — |
8) |  | Unsecured convertible promissory note amounting to $213,293 with principal and interest due at maturity at the higher of: a) 1% per annum or b) at the lowest rate that may accrue without causing the imputation of interest under the Internal Revenue Code, and maturing on the earlier of: 1) December 31, 2013, 2) event of default, as defined in the agreement, or 3) the closing of an initial public offering of the Company’s common stock. The promissory note converted into 61,485 shares of the Company’s common stock immediately upon completion of the Company’s initial public offering. The intrinsic value of embedded beneficial conversion feature associated with these convertible promissory notes was determined to be $93,498 and was recorded as debt discount. |  |  |  |  |  |  |
|  | During the year ended December 31, 2013, the Company incurred interest expense amounting to $93,498 related to the accretion of debt discount. Interest expense, including accretion of debt discount, amounted to $93,942 for the year ended December 31, 2013. The effective interest rate on this note was 214% per annum for the year ended December 31, 2013. |  |  | — |  |  | — |
|  |  |  | $ | — |  | $ | 2,445,836 |
Less current portion of long-term debt, net of debt discount of $3,828,711 at December 31, 2012 |  |  | — |  |  | 1,313,146 |
Long-term debt |  | $ | — |  | $ | 1,132,690 |

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