Document_and_Entity_Informatio
Document and Entity Information (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Mar. 09, 2015 | Jun. 30, 2014 | |
Document and Entity Information: | |||
Entity Registrant Name | PLUG POWER INC | ||
Document Type | 10-K | ||
Document Period End Date | 31-Dec-14 | ||
Amendment Flag | FALSE | ||
Entity Central Index Key | 1093691 | ||
Current Fiscal Year End Date | -19 | ||
Entity Common Stock, Shares Outstanding | 173,406,363 | ||
Entity Public Float | $777,048,639 | ||
Entity Filer Category | Large Accelerated Filer | ||
Entity Current Reporting Status | Yes | ||
Entity Voluntary Filers | No | ||
Entity Well-known Seasoned Issuer | Yes | ||
Document Fiscal Year Focus | 2014 | ||
Document Fiscal Period Focus | FY |
Consolidated_Balance_Sheets
Consolidated Balance Sheets (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Current assets: | ||
Cash and cash equivalents | $146,205,071 | $5,026,523 |
Accounts receivable | 16,094,788 | 4,699,730 |
Inventory | 24,735,601 | 10,406,320 |
Prepaid expenses and other current assets | 5,709,766 | 1,850,859 |
Total current assets | 192,745,226 | 21,983,432 |
Restricted cash | 500,000 | 500,000 |
Property, plant, and equipment, net | 5,311,907 | 5,277,667 |
Leased property under capital lease, net | 1,936,826 | 2,453,312 |
Note receivable | 447,408 | 509,945 |
Intangible assets, net | 1,490,319 | 2,901,595 |
Other assets | 3,448,974 | 1,729,670 |
Total assets | 205,880,660 | 35,355,621 |
Current liabilities: | ||
Accounts payable | 10,185,085 | 3,094,385 |
Accrued expenses | 8,749,356 | 3,068,774 |
Product warranty reserve | 1,311,442 | 1,608,131 |
Deferred revenue | 3,318,919 | 1,705,065 |
Obligations under capital lease | 586,879 | 717,870 |
Other current liabilities | 1,554,960 | 679,176 |
Total current liabilities | 25,706,641 | 10,873,401 |
Obligations under capital lease | 586,879 | |
Deferred revenue | 8,501,404 | 7,308,951 |
Common stock warrant liability | 9,418,413 | 28,829,849 |
Finance obligation | 2,426,028 | 2,492,330 |
Other liabilities | 392,335 | 765,281 |
Total liabilities | 46,444,821 | 50,856,691 |
Redeemable preferred stock | ||
Series C redeemable convertible preferred stock, $0.01 par value per share (aggregate involuntary liquidation preference $16,663,782) 10,431 shares authorized; Issued and outstanding: 5,231 at December 31, 2014 and 10,431 at December 31, 2013 | 1,152,720 | 2,371,080 |
Stockholders' equity (deficit): | ||
Common stock, $0.01 par value per share; 450,000,000 shares authorized; Issued (including shares in treasury): 173,644,532 at December 31, 2014 and 106,356,558 at December 31, 2013 | 1,736,445 | 1,063,566 |
Additional paid-in capital | 1,096,391,668 | 831,155,925 |
Accumulated other comprehensive income | 897,807 | 897,807 |
Accumulated deficit | -938,080,766 | -849,437,066 |
Less common stock in treasury: 378,116 shares at December 31, 2014 and 165,906 at December 31, 2013 | -2,662,035 | -1,552,382 |
Total stockholders' equity (deficit) | 158,283,119 | -17,872,150 |
Total liabilities, redeemable preferred stock, and stockholders' equity (deficit) | $205,880,660 | $35,355,621 |
Consolidated_Balance_Sheets_Pa
Consolidated Balance Sheets (Parentheticals) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Consolidated Balance Sheets | ||
Series C redeemable convertible Preferred Stock, par value (in dollars per share) | $0.01 | $0.01 |
Series C redeemable convertible Preferred Stock, shares authorized | 10,431 | 10,431 |
Series C redeemable convertible Preferred Stock, shares issued | 5,231 | 10,431 |
Series C redeemable convertible Preferred Stock, shares outstanding | 5,231 | 10,431 |
Series C redeemable convertible Preferred Stock, aggregate involuntary liquidation preference (in dollars) | $16,663,782 | |
Common Stock, par value (in dollars per share) | $0.01 | $0.01 |
Common Stock, shares authorized | 450,000,000 | 245,000,000 |
Common Stock, shares issued | 173,644,532 | 106,356,558 |
Common stock in treasury, shares | 378,116 | 165,906 |
Consolidated_Statements_of_Ope
Consolidated Statements of Operations (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Revenue | |||
Product revenue | $40,504,929 | $18,446,082 | $20,791,874 |
Service revenue | 21,806,224 | 6,658,816 | 3,615,253 |
Research and development contract revenue | 1,918,731 | 1,496,530 | 1,701,330 |
Total revenue | 64,229,884 | 26,601,428 | 26,108,457 |
Cost of product revenue | 35,334,038 | 20,414,084 | 25,353,541 |
Cost of service revenue | 30,556,292 | 14,928,595 | 12,304,158 |
Cost of research and development contract revenue | 3,202,122 | 2,505,989 | 2,804,817 |
Research and development expense | 6,468,470 | 3,121,007 | 5,434,235 |
Selling, general and administrative expenses | 21,809,222 | 12,325,466 | 14,576,998 |
Legal reserve | 2,400,000 | ||
Amortization of intangible assets | 2,391,276 | 2,270,858 | 2,306,489 |
Operating loss | -37,931,536 | -28,964,571 | -36,671,781 |
Interest and other income | 751,963 | 150,006 | 226,120 |
Gain on bargain purchase | 1,014,256 | ||
Change in fair value of common stock warrant liability | -52,259,898 | -37,101,818 | 4,845,165 |
Interest and other expense | -387,288 | -398,275 | -261,958 |
Gain on sale of equity interest in joint venture | 3,234,717 | ||
Loss before income taxes | -88,812,503 | -63,079,941 | -31,862,454 |
Income tax benefit | 324,680 | 410,259 | |
Net loss attributable to the Company | -88,487,823 | -62,669,682 | -31,862,454 |
Preferred stock dividends declared | -155,877 | -121,118 | |
Net loss attributable to common shareholders | ($88,643,700) | ($62,790,800) | ($31,862,454) |
Loss per share: | |||
Basic and diluted (in dollars per share) | ($0.56) | ($0.82) | ($0.93) |
Weighted average number of common shares outstanding (in shares) | 159,228,815 | 76,436,408 | 34,376,427 |
Consolidated_Statements_of_Com
Consolidated Statements of Comprehensive Loss (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Consolidated Statements of Comprehensive Loss | |||
Net loss attributable to the Company | ($88,487,823) | ($62,669,682) | ($31,862,454) |
Other comprehensive income (loss): | |||
Foreign currency translation gain (loss) | -106,605 | 75,668 | |
Comprehensive loss | ($88,487,823) | ($62,776,287) | ($31,786,786) |
Consolidated_Statements_of_Sto
Consolidated Statements of Stockholders' Equity (Deficit) (USD $) | 0 Months Ended | 12 Months Ended | |||||||||
Apr. 30, 2014 | Mar. 11, 2014 | Jan. 15, 2014 | Sep. 16, 2013 | Feb. 20, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | |||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | ($17,872,150) | $15,030,303 | $29,035,665 | ||||||||
Balance (in shares) | 106,356,558 | ||||||||||
Net loss attributable to the Company | -88,487,823 | -62,669,682 | -31,862,454 | ||||||||
Other Comprehensive Income (Loss), Net of Tax, Total | -106,605 | 75,668 | |||||||||
Stock based compensation | 4,052,761 | 2,149,492 | 1,991,154 | ||||||||
Public offering, common stock, net | 153,949,378 | [1] | 10,422,424 | [2] | 15,790,270 | ||||||
Public offering, common stock, net (in shares) | 22,600,000 | 3,902,440 | 10,000,000 | 18,600,000 | 18,910,000 | ||||||
Exercise of warrants | 101,785,107 | [3] | 17,301,918 | [4] | |||||||
Exercise of warrants (in shares) | 23,832,038 | ||||||||||
Shares issued for acquisition | 4,000,000 | ||||||||||
Conversion of preferred stock | 1,218,360 | ||||||||||
Stock option exercises | -362,514 | ||||||||||
Balance | 158,283,119 | -17,872,150 | 15,030,303 | ||||||||
Balance (in shares) | 173,644,532 | 106,356,558 | |||||||||
Common Stock | |||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | 1,063,566 | 384,048 | 229,244 | ||||||||
Balance (in shares) | 106,356,558 | 38,404,764 | 22,924,411 | ||||||||
Stock based compensation | 1,462 | 21,982 | 5,304 | ||||||||
Stock based compensation (in shares) | 146,174 | 2,198,154 | 530,353 | ||||||||
Public offering, common stock, net | 365,024 | [1] | 431,018 | [2] | 149,500 | ||||||
Public offering, common stock, net (in shares) | 36,502,440 | [1] | 43,101,800 | [2] | 14,950,000 | ||||||
Exercise of warrants | 239,184 | [3] | 224,950 | [4] | |||||||
Exercise of warrants (in shares) | 23,918,429 | [3] | 22,494,987 | [4] | |||||||
Stock dividend | 342 | 1,568 | |||||||||
Stock dividend (in shares) | 34,232 | 156,853 | |||||||||
Shares issued for acquisition | 5,305 | ||||||||||
Shares issued for acquisition | 530,504 | ||||||||||
Conversion of preferred stock | 55,217 | ||||||||||
Shares issued upon conversion of redeemable stock (in shares) | 5,521,676 | ||||||||||
Stock option exercises | 6,345 | ||||||||||
Stock option exercises (in shares) | 634,519 | ||||||||||
Balance | 1,736,445 | 1,063,566 | 384,048 | ||||||||
Balance (in shares) | 173,644,532 | 106,356,558 | 38,404,764 | ||||||||
Additional Paid-in-Capital | |||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | 831,155,925 | 801,840,491 | 784,213,871 | ||||||||
Stock based compensation | 4,051,299 | 2,127,510 | 1,985,850 | ||||||||
Public offering, common stock, net | 153,584,354 | [1] | 9,991,406 | [2] | 15,640,770 | ||||||
Exercise of warrants | 101,886,304 | [3] | 17,076,968 | [4] | |||||||
Stock dividend | 155,535 | 119,550 | |||||||||
Shares issued for acquisition | 3,994,695 | ||||||||||
Conversion of preferred stock | 1,163,143 | ||||||||||
Stock option exercises | 400,413 | ||||||||||
Balance | 1,096,391,668 | 831,155,925 | 801,840,491 | ||||||||
Accumulated Other Comprehensive Income | |||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | 1,004,412 | 928,744 | |||||||||
Other Comprehensive Income (Loss), Net of Tax, Total | -106,605 | 75,668 | |||||||||
Balance | 897,807 | 897,807 | 1,004,412 | ||||||||
Treasury Stock | |||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | -1,552,382 | -1,552,382 | |||||||||
Balance (in shares) | 165,906 | 165,906 | |||||||||
Exercise of warrants | -340,381 | [3] | |||||||||
Exercise of warrants (in shares) | 86,391 | [3] | |||||||||
Stock option exercises | -769,272 | ||||||||||
Stock option exercises (in shares) | 125,819 | ||||||||||
Balance | -2,662,035 | -1,552,382 | -1,552,382 | ||||||||
Balance (in shares) | 378,116 | 165,906 | 165,906 | ||||||||
Accumulated Deficit | |||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||
Balance | -849,437,066 | -786,646,266 | -754,783,812 | ||||||||
Net loss attributable to the Company | -88,487,823 | -62,669,682 | -31,862,454 | ||||||||
Stock dividend | -155,877 | -121,118 | |||||||||
Balance | ($938,080,766) | ($849,437,066) | ($786,646,266) | ||||||||
[1] | As a result of the January, March and April 2014 public offerings discussed in Note 5, Stockholders’ Equity, the Company received net proceeds of $165,722,618 of which $11,773,240 in value was ascribed to the warrants issued in the January 2014 public offering. The associated warrants have been separately valued and classified as a liability on the accompanying consolidated balance sheet. | ||||||||||
[2] | As a result of the 2013 public offerings discussed in Note 5, Stockholders’ Equity, the Company received net proceeds of $12,873,452, of which $2,451,028 in value was ascribed to the warrants issued in the February 2013 public offering. | ||||||||||
[3] | Pursuant to the exercise of warrants, additional paid-in capital was increased by $18,441,730 from the issuance of 23,832,038 shares of common stock. Additionally, paid-in capital was increased by $83,444,574 and warrant liability was reduced by $83,444,574 (the fair value of the warrants on the exercise date). | ||||||||||
[4] | Pursuant to the exercise of warrants, additional paid-in capital was increased by $5,878,146 from the issuance of 22,494,987 shares of common stock. Additionally, paid-in capital was increased by $11,198,822 and warrant liability was reduced by $11,198,822 (the fair value of the warrants on the exercise date). |
Consolidated_Statements_of_Sto1
Consolidated Statements of Stockholders' Equity (Deficit) (Parenthetical) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||
Apr. 30, 2014 | Mar. 11, 2014 | Jan. 15, 2014 | Sep. 16, 2013 | Feb. 20, 2013 | Mar. 29, 2012 | Mar. 28, 2012 | Feb. 28, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |||
Increase (Decrease) in Stockholders' Equity | |||||||||||||
Net proceeds from public offerings | $27,970,256 | $10,600,000 | $1,900,000 | $2,085,525 | $13,704,745 | $2,300,000 | $165,722,618 | $12,873,452 | |||||
Public offering, common stock, net (in shares) | 22,600,000 | 3,902,440 | 10,000,000 | 18,600,000 | 18,910,000 | ||||||||
Exercise of warrants (in shares) | 23,832,038 | ||||||||||||
Reduction in warrant liability | 83,444,574 | ||||||||||||
Common Stock | |||||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||||
Increase in additional paid-in capital | 18,441,730 | ||||||||||||
Public offering, common stock, net (in shares) | 36,502,440 | [1] | 43,101,800 | [2] | 14,950,000 | ||||||||
Exercise of warrants (in shares) | 23,918,429 | [3] | 22,494,987 | [4] | |||||||||
Warrants | |||||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||||
Proceeds from warrants issued | 2,451,028 | 11,773,240 | |||||||||||
Increase in additional paid-in capital | 5,878,146 | ||||||||||||
Public offering, common stock, net (in shares) | 22,494,987 | ||||||||||||
Reduction in warrant liability | 11,198,822 | ||||||||||||
Warrants | Common Stock | |||||||||||||
Increase (Decrease) in Stockholders' Equity | |||||||||||||
Increase in additional paid-in capital | $11,198,822 | ||||||||||||
[1] | As a result of the January, March and April 2014 public offerings discussed in Note 5, Stockholders’ Equity, the Company received net proceeds of $165,722,618 of which $11,773,240 in value was ascribed to the warrants issued in the January 2014 public offering. The associated warrants have been separately valued and classified as a liability on the accompanying consolidated balance sheet. | ||||||||||||
[2] | As a result of the 2013 public offerings discussed in Note 5, Stockholders’ Equity, the Company received net proceeds of $12,873,452, of which $2,451,028 in value was ascribed to the warrants issued in the February 2013 public offering. | ||||||||||||
[3] | Pursuant to the exercise of warrants, additional paid-in capital was increased by $18,441,730 from the issuance of 23,832,038 shares of common stock. Additionally, paid-in capital was increased by $83,444,574 and warrant liability was reduced by $83,444,574 (the fair value of the warrants on the exercise date). | ||||||||||||
[4] | Pursuant to the exercise of warrants, additional paid-in capital was increased by $5,878,146 from the issuance of 22,494,987 shares of common stock. Additionally, paid-in capital was increased by $11,198,822 and warrant liability was reduced by $11,198,822 (the fair value of the warrants on the exercise date). |
Consolidated_Statements_of_Cas
Consolidated Statements of Cash Flows (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Cash Flows From Operating Activities: | |||
Net loss attributable to the Company | ($88,487,823) | ($62,669,682) | ($31,862,454) |
Adjustments to reconcile net loss to net cash used in operating activities: | |||
Depreciation of property, plant and equipment, and investment in leased property | 1,946,488 | 1,907,940 | 2,069,672 |
Amortization of intangible assets | 2,391,276 | 2,270,858 | 2,306,489 |
Stock-based compensation | 4,156,636 | 2,180,869 | 2,001,840 |
Gain on sale of equity interest in joint venture | -3,234,717 | ||
Gain on bargain purchase | -1,014,256 | ||
Gain on disposal of property, plant and equipment | 78,059 | 65,899 | 51,975 |
Loss on sale of leased assets | 20,068 | ||
Change in fair value of common stock warrant liability | 52,259,898 | 37,101,818 | -4,845,165 |
Changes in operating assets and liabilities that provide (use) cash, net of effects of acquisition: | |||
Accounts receivable | -9,349,413 | -2,407,675 | 9,367,539 |
Inventory | -9,168,058 | -1,855,863 | -1,294,671 |
Prepaid expenses and other assets | -7,218,987 | 137,598 | -94,443 |
Note receivable | 62,537 | 60,752 | -570,697 |
Accounts payable, accrued expenses, product warranty reserve and other liabilities | 10,817,631 | -2,140,157 | 914,388 |
Deferred revenue | 2,746,478 | 1,701,549 | 1,770,463 |
Net cash used in operating activities | -40,779,534 | -26,880,811 | -20,164,996 |
Cash Flows From Investing Activities: | |||
Proceeds from sale of equity interest in joint venture | 3,234,717 | ||
Purchase of property, plant and equipment | -1,413,103 | -111,032 | -77,527 |
Purchase of ReliOn, net of cash acquired | 414,000 | ||
Proceeds from disposal of property, plant and equipment | 33,792 | 84,250 | 63,605 |
Net cash (used in) provided by investing activities | -965,311 | 3,207,935 | -13,922 |
Cash Flows From Financing Activities: | |||
Restricted cash | -500,000 | ||
Proceeds from exercise of stock options | 240,598 | ||
Proceeds from exercise of warrants | -603,113 | ||
Purchase of treasury stock | 18,340,534 | 6,103,096 | |
Proceeds from issuance of preferred stock | 2,595,400 | ||
Preferred stock issuance costs | -224,320 | ||
Proceeds from issuance of common stock and warrants | 176,700,006 | 14,807,718 | 17,192,500 |
Common stock issuance costs | -10,977,388 | -1,934,265 | -1,402,230 |
Repayment of borrowings under line of credit | -3,380,835 | -2,024,275 | |
Proceeds from finance obligation | 2,600,000 | 2,105,282 | |
Principal payments on obligations under capital lease and finance obligation | -777,244 | -698,674 | -170,222 |
Net cash provided by financing activities | 182,923,393 | 19,368,120 | 15,701,055 |
Effect of exchange rate changes on cash | -48,780 | 1,029 | |
Increase (decrease) in cash and cash equivalents | 141,178,548 | -4,353,536 | -4,476,834 |
Cash and cash equivalents, beginning of period | 5,026,523 | 9,380,059 | 13,856,893 |
Cash and cash equivalents, end of period | $146,205,071 | $5,026,523 | $9,380,059 |
Nature_of_Operations
Nature of Operations | 12 Months Ended |
Dec. 31, 2014 | |
Nature Of Operations. | |
Nature of Operations | |
1. Nature of Operations | |
Description of Business | |
        Plug Power Inc., or the Company, is a leading provider of alternative energy technology focused on the design, development, commercialization and manufacture of hydrogen fuel cell systems used primarily for the industrial off-road (forklift or material handling) market and the stationary power market. | |
        We are focused on proton exchange membrane, or PEM, fuel cell and fuel processing technologies, fuel cell/battery hybrid technologies, and associated hydrogen storage and dispensing infrastructure from which multiple products are available. A fuel cell is an electrochemical device that combines hydrogen and oxygen to produce electricity and heat without combustion. Hydrogen is derived from hydrocarbon fuels such as liquid petroleum gas, or LPG, natural gas, propane, methanol, ethanol, gasoline or biofuels. Hydrogen can also be obtained from the electrolysis of water, or produced on-site at consumer locations through a process known as reformation. Plug Power develops complete hydrogen delivery, storage and refueling solutions for customer locations. | |
        We sell and continue to develop fuel cell product solutions to replace lead-acid batteries in material handling vehicles and industrial trucks for some of North America's largest distribution and manufacturing businesses. We are focusing our efforts on material handling applications (forklifts) at multi-shift high volume manufacturing and high throughput distribution sites where our products and services provide a unique combination of productivity, flexibility and environmental benefits. Our current product line includes: GenDrive, our hydrogen fueled PEM fuel cell system providing power to material handling vehicles; GenFuel, our hydrogen fueling delivery system; GenCare, our ongoing maintenance program for both the GenDrive fuel cells and GenFuel products; GenKey, our turn-key solution coupling together GenDrive, GenFuel and GenCare, offering complete simplicity to customers transitioning their material handling vehicles to fuel cell power; and ReliOn, our stationary fuel cell solution providing scalable, modular PEM fuel cell power to support the backup and grid-support power requirements of the telecommunications, transportation, and utility sectors. | |
        We sell our products worldwide, with a primary focus on North America, through our direct product sales force, leveraging relationships with original equipment manufacturers, or OEMs, and their dealer networks. We are party to a joint venture based in France with Axane, S.A. under the name HyPulsion, to develop and sell hydrogen fuel cell systems for the European material handling market. We sell to businesses and government agencies. | |
        We were organized in the State of Delaware on June 27, 1997. | |
        Unless the context indicates otherwise, the terms "Company," "Plug Power," "we," "our" or "us" as used herein refers to Plug Power Inc. and its subsidiaries. | |
Liquidity | |
        Our cash requirements relate primarily to working capital needed to operate and grow our business, including funding operating expenses, growth in inventory to support both shipments of new units and servicing the installed base, funding the growth in our GenKey "turn-key" solution which also includes the installation of our customer's hydrogen infrastructure as well as delivery of the hydrogen molecule, and continued development and expansion of our products. Our ability to achieve profitability and meet future liquidity needs and capital requirements will depend upon numerous factors, including the timing and quantity of product orders and shipments; the timing and amount of our operating expenses; the timing and costs of working capital needs; the timing and costs of building a sales base; the timing and costs of developing marketing and distribution channels; the timing and costs of product service requirements; the timing and costs of hiring and training product staff; the extent to which our products gain market acceptance; the timing and costs of product development and introductions; the extent of our ongoing and any new research and development programs; and changes in our strategy or our planned activities. If we are unable to fund our operations without additional external financing and therefore cannot sustain future operations, we may be required to delay, reduce and/or cease our operations and/or seek bankruptcy protection. | |
        We have experienced and continue to experience negative cash flows from operations and net losses. The Company incurred net losses attributable to common shareholders of $88.6 million, $62.8 million and $31.9 million for the years ended December 31, 2014, 2013 and 2012, respectively, and has an accumulated deficit of $938.1 million at December 31, 2014. | |
        Net cash used in operating activities for the year ended December 31, 2014 was $40.8 million. Additionally, on December 31, 2014, we had cash and cash equivalents of $146.2 million and net working capital of $167.0 million. This compares to $5.0 million and $11.1 million, respectively, at December 31, 2013. | |
        During 2014, we received gross proceeds of $176.7 million from three underwritten public offerings. Net proceeds after underwriting discounts and commissions and other estimated fees and expenses were $165.7 million. See Note 5 (Stockholders' Equity) of the consolidated financial statements for more detail. In addition, during 2014 we received $18.3 million from the exercise of previously issued common stock warrants. | |
        To date, we have funded our operations primarily through public and private offerings of common and preferred stock, a sale-leaseback of our building, our previous line of credit and maturities. The Company believes that its current cash, cash equivalents, cash generated from future sales and cash generated from the exercise of outstanding warrants will provide sufficient liquidity to fund operations for at least the next twelve months. This projection is based on our current expectations regarding product sales, cost structure, cash burn rate and operating assumptions. | |
Summary_of_Significant_Account
Summary of Significant Accounting Policies | 12 Months Ended | ||||||||||
Dec. 31, 2014 | |||||||||||
Basis of Presentation | |||||||||||
Summary of Significant Accounting Policies | 2. Summary of Significant Accounting Policies | ||||||||||
Principles of Consolidation | |||||||||||
        The consolidated financial statements include the financial statements of Plug Power Inc. and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. | |||||||||||
Cash Equivalents | |||||||||||
        Cash equivalents consist of money market accounts with an initial term of less than three months. For purposes of the consolidated statements of cash flows, the Company considers all highly-liquid debt instruments with original maturities of three months or less to be cash equivalents. The Company's cash and cash equivalents are deposited with financial institutions located in the U.S. and may at times exceed insured limits. | |||||||||||
Accounts Receivable | |||||||||||
        Accounts receivable related to product and service arrangements are recorded when products are shipped or delivered to customers, as appropriate. Accounts receivable related to contract research and development arrangements are recorded as work is completed under the applicable contract. Accounts receivable are stated at the amount billed to customers and are ordinarily due between 30 and 60 days after the issuance of the invoice. Accounts are considered delinquent when more than 90 days past due, and no extended payment agreements have been granted. Receivables are reserved or written off based on individual credit evaluation and specific circumstances of the customer. The allowance for doubtful accounts and related receivable are reduced when the amount is deemed uncollectible. As of December 31, 2014 and December 31, 2013, the allowance for doubtful accounts was $0. | |||||||||||
Inventory | |||||||||||
        Inventories are valued at the lower of cost, determined on a first-in, first-out basis, or market. In the case of our consignment arrangements, we do not relieve inventory until the customer has accepted the product, at which time the risks and rewards of ownership have transferred. At December 31, 2014 and 2013, inventory on consignment was valued at approximately $1,611,000 and $1,178,000, respectively. | |||||||||||
Intangible Assets | |||||||||||
        Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment when certain triggering events occur. Intangible assets consist of acquired technology, customer relationships and trademarks, and are amortized using a straight-line method over their useful lives of 5-10 years. | |||||||||||
Revenue Recognition | |||||||||||
Products and Services | |||||||||||
        The Company recognizes revenue under arrangements for products and services, which may include the sale of products and related services, including revenue from installation, service and maintenance, spare parts, hydrogen fueling services, which may include hydrogen supply as well as hydrogen fueling infrastructure, and leased units. The Company also recognizes revenue under research and development contracts, which are primarily cost reimbursement contracts associated with the development of PEM fuel cell technology. | |||||||||||
        The Company enters into revenue arrangements that may contain a combination of fuel cell systems and equipment, which may be sold, or under a limited number of arrangements leased to customers, installation, service, maintenance, spare parts, hydrogen fueling and other support services. For these multiple deliverable arrangements, the Company accounts for each separate deliverable as a separate unit of accounting if the delivered item or items have value to the customer on a standalone basis. The Company considers a deliverable to have standalone value if the item is sold separately by us or another entity or if the item could be resold by the customer. The Company allocates revenue to each separate deliverable based on its relative selling price. For a majority of our deliverables, the Company determines relative selling prices using its best estimate of the selling price as vendor-specific objective evidence and third-party evidence is generally not available for the deliverables involved in its revenue arrangements due to a lack of a competitive environment in selling fuel cell technology. When determining estimated selling prices, the Company may consider the cost to produce the deliverable, the anticipated margin on that deliverable, the selling price and profit margin for similar products and services, the Company's ongoing pricing strategy and policies, the value of any enhancements that have been built into the deliverable and the characteristics of the varying markets in which the deliverable is sold, as applicable. The Company determines estimated selling prices for deliverables in its agreements based on the specific facts and circumstances of each arrangement and analyzes the estimated selling prices used for its allocation of arrangement consideration of each arrangement. | |||||||||||
        Once relative selling prices are determined, the Company proportionately allocates the sale consideration to each element of the arrangement. The allocated sales consideration related to fuel cell systems and equipment, spare parts, and hydrogen infrastructure is recognized as revenue at shipment if title and risk of loss have passed to the customer, there is persuasive evidence of an arrangement, the sales price is fixed or determinable, collection of the related receivable is reasonably assured, and customer acceptance criteria, if any, have been successfully demonstrated. The allocated sales consideration related to installation, service, maintenance, and hydrogen molecule delivery is generally recognized as revenue when completed or on a straight-line basis over the term of the contract, as appropriate. | |||||||||||
        In the case of consignment sales, the Company does not recognize revenue until the customer has accepted the product, at which time the risks and rewards of ownership have transferred, the price is fixed, and the Company has a reasonable expectation of collection upon billing. | |||||||||||
        The Company does not include a right of return on its products other than rights related to warranty provisions that permit repair or replacement of defective goods. The Company accrues for anticipated warranty costs at the same time that revenue is recognized for the related product. | |||||||||||
        The Company has also sold extended warranty contracts that generally provide for a five to ten year warranty from the date of product installation. These types of contacts are accounted for as a separate deliverable, and accordingly, revenue generated from these transactions is deferred and recognized in income over the warranty period, generally on a straight-line basis. Additionally, the Company may enter into annual service and maintenance contracts that are billed monthly. Revenue generated from these transactions is recognized in income on a straight-line basis over the term of the contract. | |||||||||||
        At December 31, 2014 and December 31, 2013, the Company had unbilled amounts from product and service revenues of approximately $616,000 and $184,000, respectively, which is included in other current assets in the accompanying consolidated balance sheets. At December 31, 2014 and December 31, 2013, the Company had deferred product and service revenues in the amount of $11.8 million and $9.0 million, respectively. | |||||||||||
Research and Development Contracts | |||||||||||
        Contract accounting is used for research and development contract revenue. The Company generally shares in the cost of these programs with cost sharing percentages ranging from 30% to 50% of total project costs. Revenue from time and material contracts is recognized on the basis of hours expended plus other reimbursable contract costs incurred during the period. All allowable work performed through the end of each calendar quarter is billed, subject to limitations in the respective contracts. We expect to continue research and development contract work that is directly related to our current product development efforts. At December 31, 2014 and 2013, the Company had unbilled amounts from research and development contract revenue in the amount of approximately $1,047,000 and $111,000, respectively, which is included in other current assets in the accompanying consolidated balance sheets. Unbilled amounts at December 31, 2014 are expected to be billed during the first quarter of 2015. | |||||||||||
Product Warranty Reserve | |||||||||||
        The GenDrive contracts we enter into generally provide a one to two year product warranty to customers from date of installation, and the ReliOn contracts we enter into generally provide a two to five year product warranty. We currently estimate the costs of satisfying warranty claims based on an analysis of past experience and provide for future claims in the period the revenue is recognized. Factors that affect our warranty liability include the number of installed units, estimated material costs, estimated travel, and labor costs. | |||||||||||
Sale-leaseback transactions | |||||||||||
        Under a limited number of arrangements, the Company provides its products and services to customers in the form of an operating lease that can vary in term from five to six years. For these specific transactions, the Company will complete a sale-leaseback for the related assets to a financial institution for similar five to six year terms. The Company accounts for sale-leaseback transactions in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Subtopic 840-40, Leases—Sale-Leaseback Transactions.  | |||||||||||
Property, Plant and Equipment | |||||||||||
        Property, plant and equipment are originally recorded at cost or, if acquired as part of business combination, at fair value. Maintenance and repairs are expensed as costs are incurred. Depreciation on plant and equipment, which includes depreciation on the Company's facility that is accounted for as a financing obligation (see Note 11, Finance Obligation), is calculated on the straight-line method over the estimated useful lives of the assets. The Company records depreciation and amortization over the following estimated useful lives: | |||||||||||
                                                                                                                                                                                    | |||||||||||
Buildings | 20Â years | ||||||||||
Building improvements | 5 - 20Â years | ||||||||||
Software, machinery and equipment | 1 - 15Â years | ||||||||||
        Gains and losses resulting from the sale of property and equipment are recorded in current operations. | |||||||||||
Leased Property Under Capital Lease | |||||||||||
        Leased property under capital lease is stated at the present value of minimum lease payments. Amortization expense is recorded on a straight-line basis over 6 years, the shorter of the lease term and the estimated useful life of the asset. Amortization expense amounted to $516,486 and $516,487 for the years ended December 31, 2014 and December 31, 2013, respectively, and has been included in cost of service revenue in the accompanying consolidated statements of operations. | |||||||||||
Impairment of Long-Lived Assets | |||||||||||
        Long-lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated undiscounted future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Fair value is determined through various valuation techniques, including discounted cash flow models, quoted market values and third party independent appraisals, as considered necessary. Assets to be disposed of and considered held for sale would be separately presented in the consolidated balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet. | |||||||||||
Common Stock Warrant Accounting | |||||||||||
        The Company accounts for common stock warrants in accordance with applicable accounting guidance provided in ASC Subtopic 815-40, Derivatives and Hedging—Contracts in Entity's Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. In compliance with applicable securities law, registered common stock warrants that require the issuance of registered shares upon exercise and do not sufficiently preclude an implied right to cash settlement are accounted for as derivative liabilities. We currently classify these derivative warrant liabilities on the accompanying consolidated balance sheets as a long-term liability, which is revalued at each balance sheet date subsequent to the initial issuance using the Black-Scholes pricing model. The Black-Scholes pricing model, which is based, in part, upon unobservable inputs for which there is little or no market data, requires the Company to develop its own assumptions. Changes in the fair value of the warrants are reflected in the accompanying consolidated statements of operations as change in fair value of common stock warrant liability. | |||||||||||
Income Taxes | |||||||||||
        Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets if it is more likely than not that such assets will not be realized. We did not report a benefit for federal and state income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized. | |||||||||||
        The Company accounts for uncertain tax positions in accordance with FASB ASC No. 740-10-25, Income Taxes—Overall - Recognition. The Company recognizes in its consolidated financial statements the impact of a tax position only if that position is more likely than not to be sustained on audit, based on the technical merits of the position. | |||||||||||
Foreign Currency Translation | |||||||||||
        Historically, foreign currency translation adjustments arose from conversion of the Company's foreign subsidiary's financial statements to U.S. dollars for reporting purposes, and were included in accumulated other comprehensive income (loss) in stockholders' equity (deficit) on the accompanying consolidated balance sheets. As of September 30, 2013, the functional currency of our last remaining foreign subsidiary, Plug Power Canada Inc., was changed to the U.S. dollar, therefore these translation adjustments will no longer occur. Transaction gains and losses resulting from the effect of exchange rate changes on transactions denominated in currencies other than the U.S. dollar give rise to realized foreign currency transaction gains and losses, and are included in interest and other expense in the accompanying consolidated statements of operations. | |||||||||||
Research and Development | |||||||||||
        Costs incurred in research and development by the Company are expensed as incurred. | |||||||||||
Joint Venture | |||||||||||
        On February 29, 2012 we completed the formation of our joint venture with Axane, S.A., a subsidiary of Air Liquide, under the name HyPulsion (the JV). The principal purpose of the JV is to develop and sell hydrogen fuel cell systems for the European material handling market. Axane contributed in exchange for an initial 55% ownership of the JV, subject to certain conditions. We contributed to the JV the right to use our technology, including design and technology know-how on GenDrive systems, in exchange for an initial 45% ownership of the JV. We have not contributed any cash to the JV and we are not obligated to contribute any cash or otherwise fund any losses of the JV.  | |||||||||||
        On April 19, 2013 Axane purchased an additional 25% ownership interest in HyPulsion from the Company for a cash purchase price of $3.2 million (Euro 2.5 million). We now own 20% and Axane owns 80% of HyPulsion, and we will share in 20% of the profits from the JV. The Company has the right to purchase an additional 60% of HyPulsion from Axane at any time between January 4, 2018 and January 29, 2018 at a formula price. If the Company exercises its purchase right, Axane will have the right, at any time between February 1, 2018 and December 31, 2021, to require the Company to buy the remaining 20% interest at a formula price. | |||||||||||
        In addition, the Company and HyPulsion also entered into an engineering service agreement under which, among other things, the Company will provide HyPulsion with engineering and technical services for a new fuel cell assembly line and manufacturing execution system. Under the service agreement, HyPulsion has paid the Company approximately $659,000 (Euro 500,000) in the aggregate for services to be performed by the Company. | |||||||||||
        In accordance with the equity method of accounting, the Company will increase its investment in the JV by its share of any earnings, and decrease its investment in the JV by its share of any losses. Losses in excess of the investment are not recognized and must be restored from future profits before we can recognize our proportionate share of profits. As of December 31, 2014, the Company had a zero basis for its investment in the JV. | |||||||||||
Redeemable Preferred Stock | |||||||||||
        On May 8, 2013, the Company entered into a Securities Purchase Agreement with Air Liquide, pursuant to which the Company agreed to issue and sell 10,431 shares of the Company's Series C Redeemable Convertible Preferred Stock, par value $0.01 per share, for an aggregate purchase price of approximately $2.6 million (Euro 2 million) in cash, as more fully discussed in Note 6, Redeemable Preferred Stock. On August 26, 2014, Air Liquide acquired 5,521,676 shares of Common Stock by converting 5,200 shares of Series C Preferred Stock at the conversion price of $0.2343. Following the conversion, Air Liquide continues to own 5,231 shares of Series C Preferred Stock. We account for preferred stock as temporary equity in accordance with applicable accounting guidance in FASB ASC Topic 480, Distinguishing Liabilities from Equity. Dividends on the redeemable preferred stock are accounted for as a reduction (increase) in the net income (loss) attributable to common shareholders. | |||||||||||
Stock-Based Compensation | |||||||||||
        The Company maintains employee stock-based compensation plans, which are described more fully in Note 7, Employee Benefit Plans. | |||||||||||
        Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. The Company measures stock-based compensation cost at grant date, based on the fair value of the award, and recognizes the cost as expense on a straight-line basis (net of estimated forfeitures) over the option's requisite service period. | |||||||||||
        The Company estimates the fair value of stock-based awards using a Black-Scholes valuation model. Stock-based compensation expense is recorded in cost of product revenue, cost of service revenue, research and development expense and selling, general and administrative expenses in the accompanying consolidated statements of operations based on the employees' respective function. | |||||||||||
        The Company records deferred tax assets for awards that result in deductions on the Company's income tax returns, based upon the amount of compensation cost recognized and the Company's statutory tax rate. Differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported on the Company's income tax return are recorded in additional paid-in capital if the tax deduction exceeds the deferred tax asset or in the consolidated statements of operations if the deferred tax asset exceeds the tax deduction and no additional paid-in capital exists from previous awards. Excess tax benefits are recognized in the period in which the tax deduction is realized through a reduction of taxes payable. No tax benefit or expense for stock-based compensation has been recorded during the years ended December 31, 2014, 2013 and 2012 since the Company remains in a NOL position. | |||||||||||
Per Share Amounts | |||||||||||
        Basic earnings per common share are computed by dividing net loss attributable to common shareholders by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options, unvested restricted stock, common stock warrants, and preferred stock) were exercised or converted into common stock or resulted in the issuance of common stock (net of any assumed repurchases) that then shared in the earnings of the Company, if any. This is computed by dividing net earnings by the combination of dilutive common share equivalents, which is comprised of shares issuable under outstanding warrants, the conversion of preferred stock, and the Company's share-based compensation plans, and the weighted average number of common shares outstanding during the reporting period. Since the Company is in a net loss position, all common stock equivalents would be considered to be anti-dilutive and are, therefore, not included in the determination of diluted earnings per share. Accordingly, basic and diluted loss per share are the same. | |||||||||||
        The following table provides the components of the calculations of basic and diluted earnings per share: | |||||||||||
                                                                                                                                                                                    | |||||||||||
Year Ended December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Numerator: | |||||||||||
Net loss attributable to common shareholders | $ | (88,643,700 | ) | $ | (62,790,800 | ) | $ | (31,862,454 | ) | ||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Denominator: | |||||||||||
Weighted average number of common shares outstanding | 159,228,815 | 76,436,408 | 34,376,427 | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The dilutive potential common shares are summarized as follows: | |||||||||||
                                                                                                                                                                                    | |||||||||||
At December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Stock options outstanding | 8,367,271Â | 4,703,326Â | 1,986,255Â | ||||||||
Restricted stock outstanding | 473,336 | 650,002 | — | ||||||||
Common stock warrants(1) | 4,219,442Â | 24,137,878Â | 9,421,008Â | ||||||||
Preferred stock(2) | 5,554,594 | 10,972,859 | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Number of dilutive potential common shares | 18,614,643Â | 40,464,065Â | 11,407,263Â | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
-1 | In May 2011, the Company issued 7,128,563 warrants as part of an underwritten public offering. As a result of additional public offerings, and pursuant to the effect of the anti-dilution provisions of these warrants, the number of warrants increased to 22,995,365. Of the warrants issued in May 2011, 22,776,023 have been exercised as of December 31, 2014. In February 2013, the Company issued 23,637,500 warrants as part of an underwritten public offering. Of the warrants issued in February 2013, 23,637,400 were exercised as of December 31, 2014. In January 2014, the Company issued 4,000,000 warrants as part of an underwritten public offering. Of the warrants issued in January 2014, none have been exercised as of December 31, 2014. As of December 31, 2014, the remaining 4,219,442 warrants have a weighted average exercise price of $3.84. | ||||||||||
-2 | The preferred stock amount represents the dilutive potential common shares of the Series C redeemable convertible preferred stock issued on May 16, 2013 based on the conversion price of the preferred stock as of December 31, 2014. Of the 10,431 preferred shares issued in May 2013, 5,200 had been converted to common stock as of December 31, 2014. | ||||||||||
Use of Estimates | |||||||||||
        The consolidated financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. | |||||||||||
Reclassifications | |||||||||||
        Certain reclassifications have been made to prior period financial statements to conform to the current period presentation. These reclassifications did not impact the results of operations or net cash flows in the periods presented. | |||||||||||
Subsequent Events | |||||||||||
        The Company evaluates subsequent events at the date of the balance sheet as well as conditions that arise after the balance sheet date but before the consolidated financial statements are issued. The effects of conditions that existed at the balance sheet date are recognized in the consolidated financial statements. Events and conditions arising after the balance sheet date but before the consolidated financial statements are issued are evaluated to determine if disclosure is required to keep the consolidated financial statements from being misleading. To the extent such events and conditions exist, if any, disclosures are made regarding the nature of events and the estimated financial effects for those events and conditions. | |||||||||||
Recent Accounting Pronouncements | |||||||||||
        On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. | |||||||||||
Acquisition_of_ReliOn_Inc
Acquisition of ReliOn Inc | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Acquisition of ReliOn Inc. | ||||||||
Acquisition of ReliOn Inc. | ||||||||
3. Acquisition of ReliOn, Inc. | ||||||||
        On April 2, 2014, the Company completed the acquisition of ReliOn, Inc. ("ReliOn") for an aggregate purchase price of $4,000,000. The Company acquired substantially all of the assets of ReliOn, including patents, technology and other intangible assets, equipment and other tangible assets. ReliOn is a developer of hydrogen fuel cell stack technology based in Spokane, Washington. As consideration, the Company issued 530,504 shares of common stock, and assumed certain specified liabilities of ReliOn. The total purchase price of $4,000,000 is based on the issuance of 530,504 shares of Plug Power common stock at the closing price of the Company's stock on April 1, 2014 of $7.54. | ||||||||
        The following table summarizes the allocation of the purchase price to the estimated fair value of the net assets acquired: | ||||||||
                                                                                                                                                                                    | ||||||||
Cash and cash equivalents | $ | 414,000 | ||||||
Accounts receivable | 315,975 | |||||||
Inventory | 5,161,223 | |||||||
Prepaid expenses and other assets | 88,894 | |||||||
Property and equipment | 162,990 | |||||||
Identifiable intangibles | 980,000 | |||||||
Accounts payable and accrued expenses | (1,682,782 | ) | ||||||
Note payable | (426,044 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ||||
Total Net Assets Acquired | $ | 5,014,256 | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
Gain on bargain purchase | (1,014,256 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ||||
Acquisition consideration | $ | 4,000,000 | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
        The fair value of the acquired net assets exceeded the purchase consideration, and therefore a gain on bargain purchase of $1,014,256 was recognized during the year ended December 31, 2014. | ||||||||
        The results of operations of ReliOn are consolidated in the Company's results of operations beginning on the acquisition date of April 2, 2014. The following unaudited pro forma financial information for the years ended December 31, 2014 and 2013 present the consolidated operations data of the Company as if the ReliOn acquisition had been made on January 1, 2013. The unaudited pro forma financial information is provided for informational purposes only and does not project the Company's results of operations for any future period. | ||||||||
                                                                                                                                                                                    | ||||||||
Year ended | Year ended | |||||||
December 31, 2014 | December 31, 2013 | |||||||
Revenue | $ | 65,361,494 | $ | 31,190,848 | ||||
Net loss attributable to the Company | (88,925,977 | ) | (69,645,886 | ) | ||||
Basic and diluted loss per share | $ | (0.56 | ) | $ | (0.90 | ) | ||
Inventory
Inventory | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Inventory. | ||||||||
Inventory | 4. Inventory | |||||||
        Inventory as of December 31, 2014 and December 31, 2013 consisted of the following: | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, 2014 | December 31, 2013 | |||||||
Raw materials and supplies | $ | 18,501,386Â | $ | 8,881,596Â | ||||
Work-in-process | 237,268Â | 219,327Â | ||||||
Finished goods | 5,996,947Â | 1,305,397Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 24,735,601Â | $ | 10,406,320Â | |||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Stockholders_Equity
Stockholders' Equity | 12 Months Ended |
Dec. 31, 2014 | |
Consolidated Statements of Stockholders' Equity (Deficit) | |
Stockholders' Equity | 5. Stockholders' Equity |
Common Stock | |
        The Company has one class of common stock, par value $.01 per share. Each share of the Company's common stock is entitled to one vote on all matters submitted to stockholders. There were 173,266,416 and 106,190,652 shares of common stock outstanding as of December 31, 2014 and 2013, respectively. | |
Preferred Stock | |
        The Company has authorized 5.0 million shares of preferred stock, par value $.01 per share. The Company's certificate of incorporation provides that shares of preferred stock may be issued from time to time in one or more series. The Company's Board of Directors is authorized to fix the voting rights, if any, designations, powers, preferences, qualifications, limitations and restrictions thereof, applicable to the shares of each series. | |
        The Company has authorized Series A Junior Participating Cumulative Preferred Stock, par value $.01 per share. As of December 31, 2013 and 2012, there were no shares of Series A Junior Participating Cumulative Preferred Stock issued and outstanding. | |
2014 Public Offerings | |
        On April 30, 2014, we completed an underwritten public offering of 22,600,000 shares of common stock. The shares were sold at $5.50 per share for gross proceeds of $124,300,000. The total net proceeds to Plug Power from the April 2014 public offering were $116,443,375. | |
        On March 11, 2014, we completed an underwritten public offering of 3,902,440 shares of common stock. The shares were sold at $5.74 per share for gross proceeds of $22,400,006. The shares were placed with a single institutional investor. The total net proceeds to Plug Power from the March 2014 public offering were approximately $21,308,987. | |
        On January 15, 2014 we completed an underwritten public offering of 10,000,000 shares of common stock and accompanying warrants to purchase 4,000,000 shares of common stock. The shares and the warrants were sold together in a fixed combination, with each combination consisting of one share of common stock and 0.40 of a warrant to purchase one share of common stock, at a price of $3.00 per fixed combination for gross proceeds of $30,000,000. The securities were placed with a single institutional investor, and are subject to weighted average anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement. Additionally, in the event of a sale of the Company, and under certain conditions, each warrant holder has the right to require the Company to purchase such holder's warrants at a price determined using a Black-Scholes option pricing model. The warrants have an exercise price of $4.00 per share, are immediately exercisable and will expire on January 15, 2019. The total net proceeds to Plug Power from the January 2014 public offering was approximately $27,970,256. | |
2013 Public Offerings | |
        On September 16, 2013, the Company completed an underwritten public offering of 18,600,000 shares of common stock. The shares were sold at $0.54 per share. Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power were $9,151,221. The Company also sold an additional 2,790,000 shares of common stock at $0.54 per share, pursuant to the underwriter's exercise of its over-allotment option in connection with the September 16, 2013 underwritten public offering, resulting in additional net proceeds to Plug Power of $1,408,671. The total net proceeds from the September 2013 public offering to Plug Power were approximately $10.6 million. | |
        On February 20, 2013, the Company completed an underwritten public offering of 18,910,000 shares of common stock and warrants to purchase an aggregate of 18,910,000 shares of common stock. The shares and warrants in the underwritten public offering were sold as a fixed combination, with each combination consisting of one share of common stock and one warrant to purchase one share of common stock at a price to the public of $0.15 per fixed combination. The underwriter also purchased 2,836,500 warrants pursuant to the exercise of its over-allotment option. These warrants have an exercise price of $0.15 per share, are immediately exercisable and will expire on February 20, 2018. The warrants are subject to weighted average anti-dilution provisions in the event of issuance of additional shares of common stock and certain other conditions, as further described in the warrant agreement. Additionally, in the event of a sale of the Company, and under certain conditions, each warrant holder has the right to require the Company to purchase such holder's warrants at a price determined using a Black-Scholes option pricing model. The underwriter was also granted an additional 1,891,000 warrants at $0.18 per share. These warrants are exercisable on February 13, 2014 and will expire on February 13, 2018. Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power, were approximately $1.9 million. On February 21, 2013, the Company sold 2,801,800 additional shares of common stock, pursuant to the underwriter's exercise of its overallotment option in connection with the public offering, resulting in additional net proceeds to the Company of approximately $0.4 million. The total net proceeds from the February 2013 public offerings to Plug Power were approximately $2.3 million. | |
2012 Public Offerings | |
        On March 28, 2012, the Company completed an underwritten public offering of 13,000,000 shares of its common stock. The shares were sold at $1.15 per share. Net proceeds, after underwriting discounts and commissions and other fees and expenses payable by Plug Power were $13,704,745. | |
        On March 29, 2012, the Company sold 1,950,000 additional shares of common stock at $1.15 per share, pursuant to the underwriter's exercise of its over-allotment option in connection with the March 28, 2012 underwritten public offering, resulting in additional net proceeds to Plug Power of $2,085,525. | |
Redeemable_Preferred_Stock
Redeemable Preferred Stock | 12 Months Ended |
Dec. 31, 2014 | |
Redeemable Preferred Stock | |
Redeemable Preferred Stock | 6. Redeemable Preferred Stock |
        On May 8, 2013, the Company entered into a Securities Purchase Agreement (the "Purchase Agreement") with Air Liquide Investissements d'Avenir et de Demonstration ("Air Liquide"), pursuant to which the Company agreed to issue and sell to Air Liquide 10,431 shares of the Company's Series C Redeemable Convertible Preferred Stock, par value $0.01 per share (the "Series C Preferred Stock"), for an original issue price of $2,595,400 in cash. Net proceeds, after fees and expenses paid by the Company, were $2,371,080. | |
        Under the terms of the Purchase Agreement, for so long as Air Liquide holds any shares of Series C Preferred Stock, Air Liquide shall be entitled to designate one director to the Company's Board of Directors. In the event the Series C Preferred Stock is converted into shares of Common Stock and Air Liquide continues to hold at least 5% of the outstanding shares of Common Stock of the Company, or 50% of the shares of Common Stock held by Air Liquide on an as-converted basis immediately following the issuance of the Series C Preferred Stock, Air Liquide shall continue to be entitled to designate one director to the Company's Board of Directors. The Purchase Agreement also provides Air Liquide with the right to participate in certain future equity financings by the Company. | |
        The Series C Preferred Stock ranks senior to the Common Stock with respect to rights upon the liquidation, dissolution or winding up of the Company. In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company, or other deemed liquidation event, as defined in the Securities Purchase Agreement, the holders of the Series C Preferred Stock will be entitled to be paid an amount per share equal to the greater of (i) the original issue price, plus any accrued but unpaid dividends or (ii) the amount per share that would have been payable had all shares of Series C Preferred Stock been converted to shares of common stock immediately prior to such liquidation event. | |
        The Series C Preferred Stock is entitled to receive dividends at a rate of 8% per annum, based on the original issue price of $2,595,400, payable in equal quarterly installments in cash or in shares of Common Stock, at the Company's option. Originally, the Series C Preferred Stock could be converted into shares of Common Stock, at a conversion price equal to $0.248794 per share, at Air Liquide's option, (1) on or after May 8, 2014 or (2) upon any liquidation, dissolution or winding up of the Company, any sale, consolidation or merger of the Company resulting in a change of control, or any sale or other transfer of all or substantially all of the assets of the Company. The number of shares of common stock was to be determined by dividing the original issue price of $2,595,400 by the conversion price in effect at the time the shares are converted. | |
        The Series C Preferred Stock has weighted average anti-dilution protection. Therefore, the conversion price is subject to adjustment in the event the Company issues additional shares of common stock for a consideration per share less than the Series C conversion price in effect immediately prior to such issue. Upon this occurrence, the conversion price shall be reduced to a price determined in accordance with a prescribed formula. Accordingly, with the exercise of 18,846,400 warrants at $0.15 and 1,891,000 warrants at $0.18 occurring after the close of the redeemable preferred stock sale, the Series C Preferred Stock conversion price was adjusted from $0.248794 per share to $0.2343 per share. | |
        On August 26, 2014, Air Liquide acquired 5,521,676 shares of Common Stock by converting 5,200 shares of Series C Preferred Stock at the conversion price of $0.2343. Air Liquide continues to own 5,231 shares of Series C Preferred Stock. | |
        The Series C Preferred Stock may not be redeemed by the Company until May 8, 2016. After this date, the Series C Preferred Stock may be redeemed by the holders of the Series C Preferred Stock or the Company. If redeemed by the holder, the redemption price will be equal to the Series C Preferred Stock original issue price per share, plus any accruing but unpaid dividends. If redeemed at the election of the Company, the redemption price for shares of Series C Preferred Stock shall be a per share price equal to the greater of (i) the Series C Preferred Stock original issue price per share, plus any Series C accruing dividends accrued but unpaid thereon and (ii) the fair market value of a single share of Series C Preferred Stock as of the date of the redemption. | |
        The Series C Preferred Stock votes together with the Common Stock on an as-converted basis on all matters. The shares of Series C Preferred Stock were issued in a private placement exempt from registration pursuant to Section 4(2) of the Securities Act of 1933, as amended. | |
Employee_Benefit_Plans
Employee Benefit Plans | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Employee Benefit Plans | ||||||||||||||
Employee Benefit Plans | 7. Employee Benefit Plans | |||||||||||||
Stock Option Plan | ||||||||||||||
2011 Stock Option and Incentive Plan | ||||||||||||||
        On May 12, 2011, the Company's stockholders approved the 2011 Stock Option and Incentive Plan (the 2011 Plan). The 2011 Plan provides for the issuance of up to a maximum number of shares of common stock equal to the sum of (i) 1,000,000, plus (ii) the number of shares of common stock underlying any grants pursuant to the 2011 Plan or the Plug Power Inc. 1999 Stock Option and Incentive Plan that are forfeited, canceled, repurchased or are terminated (other than by exercise). The shares may be issued pursuant to stock options, stock appreciation rights, restricted stock awards and certain other equity-based awards granted to employees, directors and consultants of the Company. No grants may be made under the 2011 Plan after May 12, 2021. On May 16, 2012, the stockholders approved an amendment to the 2011 Plan, to increase the number of shares of the Company's common stock authorized for issuance under the 2011 Plan from 1.0 million to 6.5 million. On July 23, 2014, the stockholders approved an amendment to the 2011 Plan, to increase the number of shares of the Company's common stock authorized for issuance under the 2011 Plan from 6.5 million to 17.0 million. For the years ended December 31, 2014, 2013, and 2012, the Company recorded expense of approximately $4.2 million, $2.2 million, and $2.0 million respectively, in connection with its share based payment awards. | ||||||||||||||
        At December 31, 2014, there were approximately 8.4 million options granted and outstanding and 8.2 million options available to be issued under the 2011 Plan. Options for employees issued under this plan generally vest in equal annual installments over three years and expire ten years after issuance. Options granted to members of the Board generally vest one year after issuance. To date, options granted under the 2011 Plan have vesting provisions ranging from one to three years in duration and expire ten years after issuance. | ||||||||||||||
        Compensation cost associated with employee stock options represented approximately $3,374,000 of the total share-based payment expense recorded for the year ended December 31, 2014. The Company estimates the fair value of stock options using a Black-Scholes valuation model, and the resulting fair value is recorded as compensation cost on a straight-line basis over the option vesting period. Key inputs and assumptions used to estimate the fair value of stock options include the grant price of the award, the expected option term, volatility of the Company's stock, an appropriate risk-free rate, and the Company's dividend yield. Estimates of fair value are not intended to predict actual future events or the value ultimately realized by employees who receive equity awards, and subsequent events are not indicative of the reasonableness of the original estimates of fair value made by the Company. The assumptions made for purposes of estimating fair value under the Black-Scholes model for the 4,246,000, 3,090,900 and 78,400 options granted during the years ended December 31, 2014, 2013 and 2012, respectively, were as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Dividend yield: | 0% | 0% | 0% | |||||||||||
Expected term of options (years): | 6 | 6 | 6 | |||||||||||
Risk free interest rate: | 1.77% - 1.94% | 0.93% - 1.70% | 0.80% - 1.16% | |||||||||||
Volatility: | 107% - 114% | 92% - 107% | 80% | |||||||||||
        The Company's estimate of an expected option term was calculated in accordance with the simplified method for calculating the expected term assumption. The estimated stock price volatility was derived from the Company's actual historic stock prices over the past six years, which represents the Company's best estimate of expected volatility. | ||||||||||||||
        A summary of stock option activity for the year December 31, 2014 is as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Shares | Weighted | Weighted | Aggregate | |||||||||||
Average | Average | Instrinsic | ||||||||||||
Exercise | Remaining | Value | ||||||||||||
Price | Contractual | |||||||||||||
Terms | ||||||||||||||
Options outstanding at December 31, 2013 | 4,703,326 | $ | 3.22 | 8.7 | ||||||||||
Granted | 4,246,000 | 4.86 | ||||||||||||
Exercised | (417,852 | ) | 0.97 | |||||||||||
Forfeited | (143,053 | ) | 5.25 | |||||||||||
Expired | (21,150 | ) | 77.22 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | |
Options outstanding at December 31, 2014 | 8,367,271 | $ | 3.94 | 8.7 | 7,865,235 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​  | |
Options exercisable at December 31, 2014 | 2,266,607 | 5.16 | 7 | 4,895,871 | ||||||||||
Options unvested at December 31, 2014 | 6,100,664 | $ | 3.49 | 9.3 | 2,989,325 | |||||||||
        The weighted average grant date fair value of options granted during the years ended December 31, 2014, 2013 and 2012 was $4.05, $0.32 and $0.83, respectively. As of December 31, 2014, there was approximately $15,252,000 of unrecognized compensation cost related to stock option awards to be recognized over the next three years. The total fair value of stock options that vested during the years ended December 31, 2014 and 2013 was approximately $3,374,000 and $1,445,000, respectively. | ||||||||||||||
        Restricted stock awards generally vest in equal installments over a period of one to three years. Restricted stock awards are valued based on the closing price of the Company's common stock on the date of grant, and compensation cost is recorded on a straight-line basis over the share vesting period. The Company recorded expense of approximately $84,000 associated with its restricted stock awards in 2014. Additionally, as of December 31, 2014, there was $265,000 of unrecognized compensation cost related to restricted stock awards to be recognized over the next three years. | ||||||||||||||
        A summary of restricted stock activity for the year ended December 31, 2014 is as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Shares | Aggregate | |||||||||||||
Instrinsic | ||||||||||||||
Value | ||||||||||||||
Unvested restricted stock at December 31, 2013 | 650,002 | |||||||||||||
Granted | 40,000 | |||||||||||||
Vested | (216,666 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |||||||
Unvested restricted stock at December 31, 2014 | 473,336 | $ | 1,420,008 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |||||||
401(k) Savings & Retirement Plan | ||||||||||||||
        The Company offers a 401(k) Savings & Retirement Plan to eligible employees meeting certain age and service requirements. This plan permits participants to contribute 100% of their salary, up to the maximum allowable by the Internal Revenue Service regulations. Participants are immediately vested in their voluntary contributions plus actual earnings or less actual losses thereon. Participants are vested in the Company's matching contribution based on years of service completed. Participants are fully vested upon completion of three years of service. During 2002, the Company began funding its matching contribution in common stock. Accordingly, the Company has issued 74,863, 1,319,914 and 403,579 shares of common stock to the Plug Power Inc. 401(k) Savings & Retirement Plan during 2014, 2013 and 2012, respectively. | ||||||||||||||
        The Company's expense for this plan, including the issuance of shares, was approximately $367,000, $371,000 and $436,000 for years ended December 31, 2014, 2013 and 2012, respectively. | ||||||||||||||
Non-Employee Director Compensation | ||||||||||||||
        Each non-employee director is paid an annual retainer for their services. The Company granted 71,311 shares of stock to non-employee directors as compensation for the year ended December 31, 2014. All common stock issued is fully vested at the time of issuance and is valued at fair market value on the date of issuance. The Company's expense for this plan was approximately $331,000 for the year ended December 31, 2014. | ||||||||||||||
Note_Receivable
Note Receivable | 12 Months Ended |
Dec. 31, 2014 | |
Promissory Note | |
Note Receivable | 8. Note Receivable |
        On May 25, 2012, we executed a $663,359 Promissory Note with Forem Energy Group, maturing on May 25, 2022. This note is unsecured and bears interest at an annual rate of 2.9%. Accordingly, receivables relating to this agreement in the amount of $447,408 and $67,667 have been recorded as note receivable and current portion of note receivable (prepaid expenses and other current assets), respectively, in the accompanying consolidated balance sheet as of December 31, 2014, and $509,945 and $65,735 have been recorded as note receivable and current portion note receivable (prepaid expenses and other current assets), respectively, in the accompanying consolidated balance sheet as of December 31, 2013. The carrying amounts reported are considered to approximate fair value. | |
Property_Plant_and_Equipment
Property, Plant and Equipment | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Property, Plant and Equipment. | ||||||||
Property, Plant and Equipment | 9. Property, Plant and Equipment | |||||||
        Property, plant and equipment at December 31, 2014 and 2013 consist of the following: | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Land | $ | 90,000 | $ | 90,000 | ||||
Buildings | 15,332,232 | 15,332,232 | ||||||
Building improvements | 5,031,803 | 4,923,827 | ||||||
Software, machinery and equipment | 11,396,627 | 10,658,236 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
31,850,662 | 31,004,295 | |||||||
Less accumulated depreciation | (26,538,755 | ) | (25,726,628 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Property, plant, and equipment, net | $ | 5,311,907 | $ | 5,277,667 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        Depreciation expense related to property, plant and equipment was $1.4 million, $1.4 million and $1.9 million for the years ended December 31, 2014, 2013 and 2012, respectively. | ||||||||
Capital_Lease
Capital Lease | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Capital Lease | ||||||||
Capital Lease | 10. Capital Lease | |||||||
        Leased property under capital lease at December 31, 2014 and December 31, 2013 consists of the following: | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Leased property under capital lease | $ | 3,098,921 | $ | 3,098,921 | ||||
Less accumulated depreciation | (1,162,095 | ) | (645,609 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Leased property under capital lease, net | $ | 1,936,826 | $ | 2,453,312 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Finance_Obligation
Finance Obligation | 12 Months Ended | ||||
Dec. 31, 2014 | |||||
Finance Obligation. | |||||
Finance Obligation | 11. Finance Obligation | ||||
        On March 27, 2013, the Company completed a sale-leaseback transaction of its property located at 968 Albany Shaker Road, Latham, New York, for an aggregate sale price of $4,500,000, of which $2,750,000 was received in cash at closing and $1,750,000 is receivable with 5% annual interest, over 15 years in equal monthly installments of $13,839. Although the property was sold and the Company has no legal ownership of the facility, the Company was prohibited from recording the transaction as a sale because of continuing involvement with the property. Accordingly, the sale has been accounted for as a financing transaction, which requires the Company to continue reporting the building as an asset and to record a financing obligation for the sale price. Liabilities relating to this agreement of $2,426,028 and $66,303 have been recorded as finance obligation and current portion finance obligation (other current liabilities), respectively, in the accompanying consolidated balance sheet as of December 31, 2014. | |||||
        In connection with the sale-leaseback transaction, the Company also entered into an agreement with the buyer, pursuant to which the Company leases from the buyer a portion of the premises sold for a term of 15 years. The Company's remaining future minimum payments under the 15 year lease are as follows: | |||||
                                                                                                                                                                                    | |||||
2015 | $ | 459,566Â | |||
2016 | 459,566Â | ||||
2017 | 459,566Â | ||||
2018 | 486,467Â | ||||
2019 | 494,918Â | ||||
Thereafter | 4,254,405Â | ||||
​ | ​ | ​  | ​  | ​ | |
Total future minimum financing obligation payments | $ | 6,614,488Â | |||
Less interest | 2,508,417Â | ||||
​ | ​ | ​  | ​  | ​ | |
Present value of future minimum financing obligation payments | $ | 4,106,071Â | |||
​ | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​  | |
        As part of the terms of the transaction, the Company issued a standby letter of credit to the benefit of the landlord/lessor that can be drawn by the beneficiary in the event of default on the lease by Plug Power. The standby letter totals $500,000 and is 100% collateralized by cash balances of the Company. The standby letter is renewable for a period of ten years and can be cancelled in part or in full if certain covenants are met and maintained by the Company. Accordingly, as of December 31, 2014 and 2013, $500,000 has been recorded as restricted cash in the accompanying consolidated balance sheets. | |||||
Intangible_Assets
Intangible Assets | 12 Months Ended | ||||||||||||
Dec. 31, 2014 | |||||||||||||
Intangible Assets. | |||||||||||||
Intangible Assets | 12. Intangible Assets | ||||||||||||
        Intangible assets, consisting of acquired technology, customer relationships and trademarks, are amortized using the straight-line method over their useful lives of five to ten years. | |||||||||||||
        The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2014 are as follows: | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
Weighted | Gross Carrying | Accumulated | Total | ||||||||||
Average | Amount | Amortization | |||||||||||
Amortization | |||||||||||||
Period | |||||||||||||
Acquired technology | 8Â years | $ | 17,696,835 | $ | (16,539,683 | ) | $ | 1,157,152 | |||||
Customer relationships | 8Â years | 1,260,000 | (977,833 | ) | 282,167 | ||||||||
Trademark | 5Â years | 60,000 | (9,000 | ) | 51,000 | ||||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 19,016,835 | $ | (17,526,516 | ) | $ | 1,490,319 | |||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2013 are as follows: | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
Weighted | Gross Carrying | Accumulated | Total | ||||||||||
Average | Amount | Amortization | |||||||||||
Amortization | |||||||||||||
Period | |||||||||||||
Acquired technology | 8Â years | $ | 17,036,835 | $ | (14,301,907 | ) | $ | 2,734,928 | |||||
Customer relationships | 8Â years | 1,000,000 | (833,333 | ) | 166,667 | ||||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 18,036,835 | $ | (15,135,240 | ) | $ | 2,901,595 | |||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The change in the gross carrying amount of the acquired technology, customer relationships, and trademarks from December 31, 2013 to December 31, 2014 is due to the acquisition of ReliOn. | |||||||||||||
        Amortization expense for acquired identifiable intangible assets for the years ended December 31, 2014, 2013, and 2012 was $2.4 million, $2.3 million, and $2.3 million, respectively. Estimated amortization expense for subsequent years is as follows: | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
2015 | $ | 807,819Â | |||||||||||
2016 | 170,000Â | ||||||||||||
2017 | 170,000Â | ||||||||||||
2018 | 170,000Â | ||||||||||||
2019 | 62,000Â | ||||||||||||
Thereafter | 110,500Â | ||||||||||||
​ | ​ | ​  | ​  | ​ | |||||||||
Total | $ | 1,490,319Â | |||||||||||
​ | ​ | ​  | ​  | ​ | |||||||||
​ | ​ | ​  | ​  | ​  | |||||||||
Accrued_Expenses
Accrued Expenses | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Accrued Expenses | ||||||||
Accrued Expenses | 13. Accrued Expenses | |||||||
        Accrued expenses at December 31, 2014 and 2013 consist of: | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
Accrued payroll and compensation related costs | $ | 2,517,327Â | $ | 1,531,175Â | ||||
Accrued dealer commissions and customer rebates | 621,340Â | 235,690Â | ||||||
Accrued accounts payable | 5,610,689Â | 1,301,909Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total | $ | 8,749,356Â | $ | 3,068,774Â | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Fair_Value_Measurements
Fair Value Measurements | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Fair Value Measurements. | ||||||||||||||
Fair Value Measurements | 14. Fair Value Measurements | |||||||||||||
        The Company complies with the provisions of FASB ASC Topic No. 820, Fair Value Measurements and Disclosures (ASC 820), in measuring fair value and in disclosing fair value measurements. ASC 820 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements required under other accounting pronouncements. Fair value, as defined in ASC 820, is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements also reflect the assumptions market participants would use in pricing an asset or liability based on the best information available. Assumptions include the risks inherent in a particular valuation technique (such as a pricing model) and/or the risks inherent in the inputs to the model. | ||||||||||||||
        ASC 820 discusses valuation techniques, such as the market approach (comparable market prices), the income approach (present value of future income or cash flow), and the cost approach (cost to replace the service capacity of an asset or replacement cost) and utilizes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels. The following is a brief description of those three levels: | ||||||||||||||
Level 1—Level 1 inputs are unadjusted quoted prices in active markets for assets or liabilities identical to those to be reported at fair value. An active market is a market in which transactions occur for the item to be fair valued with sufficient frequency and volume to provide pricing information on an ongoing basis. | ||||||||||||||
Level 2—Level 2 inputs are inputs other than quoted prices included within Level 1. Level 2 inputs are observable either directly or indirectly. These inputs include: (a) Quoted prices for similar assets or liabilities in active markets; (b) Quoted prices for identical or similar assets or liabilities in markets that are not active, such as when there are few transactions for the asset or liability, the prices are not current, price quotations vary substantially over time or in which little information is released publicly; (c) Inputs other than quoted prices that are observable for the asset or liability; and (d) Inputs that are derived principally from or corroborated by observable market data by correlation or other means. | ||||||||||||||
Level 3—Level 3 inputs are unobservable inputs for an asset or liability. These inputs should be used to determine fair value only when observable inputs are not available. Unobservable inputs should be developed based on the best information available in the circumstances, which might include internally generated data and assumptions being used to price the asset or liability. | ||||||||||||||
        When determining the fair value measurements for assets or liabilities required or permitted to be recorded at and/or marked to fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability. When possible, the Company looks to active and observable markets to price identical assets. When identical assets are not traded in active markets, the Company looks to market observable data for similar assets. Nevertheless, certain assets are not actively traded in observable markets and the Company must use alternative valuation techniques to derive a fair value measurement. | ||||||||||||||
        The following tables summarize the basis used to measure certain financial assets at fair value on a recurring basis in the consolidated balance sheets: | ||||||||||||||
Basis of Fair Value Measurements | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Balance at December 31, 2014 | Total | Quoted Prices | Significant | Significant | ||||||||||
in Active | Other | Other | ||||||||||||
Markets for | Observable | Unobservable | ||||||||||||
Identical Items | Inputs | Inputs | ||||||||||||
(Level 1) | (Level 2) | (Level 3) | ||||||||||||
Common stock warrant liability | $ | 9,418,413 | $ | — | $ | — | $ | 9,418,413 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
                                                                                                                                                                                    | ||||||||||||||
Balance at December 31, 2013 | Total | Quoted Prices | Significant | Significant | ||||||||||
in Active | Other | Other | ||||||||||||
Markets for | Observable | Unobservable | ||||||||||||
Identical Items | Inputs | Inputs | ||||||||||||
(Level 1) | (Level 2) | (Level 3) | ||||||||||||
Common stock warrant liability | $ | 28,829,849 | $ | — | $ | — | $ | 28,829,849 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The following tables show reconciliations of the beginning and ending balances for assets measured at fair value on a recurring basis using significant unobservable inputs (i.e. Level 3): | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Common stock warrant liability | Fair Value | |||||||||||||
Measurement | ||||||||||||||
Using Significant | ||||||||||||||
Unobservable | ||||||||||||||
Inputs | ||||||||||||||
Beginning of period—January 1, 2014 | $ | 28,829,849 | ||||||||||||
Change in fair value of common stock warrants | 52,259,898 | |||||||||||||
Issuance of common stock warrants | 11,773,240 | |||||||||||||
Exercise of common stock warrants | (83,444,574 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
Fair value of common stock warrant liability at December 31, 2014 | $ | 9,418,413 | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
​ | ​ | ​  | ​  | ​  | ||||||||||
                                                                                                                                                                                    | ||||||||||||||
Common stock warrant liability | Fair Value | |||||||||||||
Measurement | ||||||||||||||
Using Significant | ||||||||||||||
Unobservable | ||||||||||||||
Inputs | ||||||||||||||
Beginning of period—January 1, 2013 | $ | 475,825 | ||||||||||||
Change in fair value of common stock warrants | 37,101,818 | |||||||||||||
Issuance of common stock warrants | 2,451,028 | |||||||||||||
Exercise of common stock warrants | (11,198,822 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
Fair value of common stock warrant liability at December 31, 2013 | $ | 28,829,849 | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
​ | ​ | ​  | ​  | ​  | ||||||||||
        The following summarizes the valuation technique for assets measured and recorded at fair value: | ||||||||||||||
        Common stock warrant liability (Level 3):    For our common stock warrants, fair value is based on the Black-Scholes pricing model which is based, in part, upon unobservable inputs for which there is little or no market data, requiring the Company to develop its own assumptions. | ||||||||||||||
        The Company used the following assumptions for its common stock warrants issued on January 20, 2014. The risk-free interest rate for January 20, 2014 (issuance date) and December 31, 2014 was 1.65% and 1.35%, respectively. The volatility of the market price of the Company's common stock for January 20, 2014 and December 31, 2014 was 107.6% and 119.2%, respectively. The expected average term of the warrants used for January 20, 2014 and December 31, 2014 was 5.0 years and 4.0 years, respectively. | ||||||||||||||
        The Company used the following assumptions for its common stock warrants issued on February 20, 2013. The risk-free interest rate for February 20, 2013 (issuance date), December 31, 2013 and December 31, 2014 was 0.85%, 1.14% and 1.06%, respectively. The volatility of the market price of the Company's common stock for February 20, 2013, December 31, 2013, and December 31, 2014 was 102.0%, 99.0% and 126.2%, respectively. The expected average term of the warrants used for February 20, 2013, December 31, 2013 and December 31, 2014 was 5.0 years, 4.1 years and 3.1 years, respectively. | ||||||||||||||
        The Company used the following assumptions for its common stock warrants issued on May 31, 2011. The risk-free interest rate for May 31, 2011 (issuance date), December 31, 2013, and December 31, 2014 was 0.75%, 0.52% and 0.21%, respectively. The volatility of the market price of the Company's common stock for May 31, 2011, December 31, 2013 and December 31, 2014 was 94.4%, 119.3% and 136.6%, respectively. The expected average term of the warrants used for May 31, 2011, December 31, 2013 and December 31, 2014 was 2.4 years, 2.4 years and 1.4 years, respectively. | ||||||||||||||
        There was no expected dividend yield for the warrants granted. If factors change and different assumptions are used, the warrant liability and the change in estimated fair value could be materially different. Generally, as the market price of our common stock increases, the fair value of the warrant increases, and conversely, as the market price of our common stock decreases, the fair value of the warrant decreases. Also, a significant increase in the volatility of the market price of the Company's common stock, in isolation, would result in a significantly higher fair value measurement; and a significant decrease in volatility would result in a significantly lower fair value measurement. | ||||||||||||||
Income_Taxes
Income Taxes | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Income Taxes. | ||||||||||||||
Income Taxes | 15. Income Taxes | |||||||||||||
        The components of loss before income taxes and the provision for income taxes for the years ended December 31, 2014, 2013 and 2012 are as follows: | ||||||||||||||
        Loss before income taxes: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
United States | $ | (87,458,000 | ) | $ | (61,730,000 | ) | $ | (30,399,000 | ) | |||||
Foreign | (1,354,000 | ) | (1,350,000 | ) | (1,463,000 | ) | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
$ | (88,812,000 | ) | $ | (63,080,000 | ) | $ | (31,862,000 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        Income tax benefit: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
United States | $ | — | $ | — | $ | — | ||||||||
Foreign | (325,000 | ) | (410,000 | ) | —  | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
$ | (325,000 | ) | $ | (410,000 | ) | $ | —  | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        The significant components of U.S. deferred income tax expense (benefit) for the years ended December 31, 2014, 2013 and 2012 are as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Deferred tax (benefit) expense | $ | (4,282,000 | ) | $ | (3,209,000 | ) | $ | 10,661,000 | ||||||
Net operating loss carryforward (generated) expired | (8,974,000 | ) | (6,536,000 | ) | 26,924,000 | |||||||||
Valuation allowance increase (decrease) | 13,256,000 | 9,745,000 | (37,585,000 | ) | ||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Provision for income taxes | $ | — | $ | — | $ | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        The significant components of foreign deferred income tax expense (benefit) for the years ended December 31, 2014, 2013 and 2012 are as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Deferred tax expense (benefit) | $ | 194,000 | $ | 1,406,000 | $ | (1,041,000 | ) | |||||||
Net operating loss carryforward expired (generated) | 625,000 | (15,000 | ) | (79,000 | ) | |||||||||
Valuation allowance (decrease) increase | (819,000 | ) | (1,391,000 | ) | 1,120,000 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Provision for income taxes | $ | — | $ | — | $ | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        The Company's effective income tax rate differed from the federal statutory rate as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
U.S. Federal statutory tax rate | (35.0Â | )% | (35.0Â | )% | (35.0Â | )% | ||||||||
Deferred state taxes, net of federal benefit | (1.2Â | )% | (1.3Â | )% | (3.3Â | )% | ||||||||
Common stock warrant liability | 20.6Â | % | 20.6Â | % | (5.3Â | )% | ||||||||
Gain on Hypulsion transaction | 0.0Â | % | (1.8Â | )% | 0.0Â | % | ||||||||
Bargain purchase gain—ReliOn | (0.4 | )% | 0.0 | % | 0.0 | % | ||||||||
Other, net | 0.1Â | % | 0.1Â | % | 0.1Â | % | ||||||||
Change to uncertain tax positions | (0.9Â | )% | (1.3Â | )% | (1.6Â | )% | ||||||||
Foreign tax rate differential | 0.2Â | % | 0.2Â | % | 0.5Â | % | ||||||||
Expiring attribute carryforward | 0.8Â | % | 2.2Â | % | 0.0Â | % | ||||||||
Adjustments to open deferred tax balance | 0.0Â | % | (0.3Â | )% | (5.8Â | )% | ||||||||
Writeoff of tax attributes due to imposition of Section 382 limitation | 0.0 | % | 1.5 | % | 165.7 | % | ||||||||
Change in valuation allowance | 15.4Â | % | 14.5Â | % | (115.3Â | )% | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
(0.4Â | )% | (0.6Â | )% | 0.0Â | % Â | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of certain assets and liabilities for financial reporting and the amounts used for income tax purposes. Significant components of the Company's deferred tax assets and liabilities as of December 31, 2014 and 2013 are as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
U.S. Years ended December 31, | Foreign Years ended | |||||||||||||
December 31, | ||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||
Intangible assets | $ | — | $ | 59,000 | $ | 1,269,000 | $ | 999,000 | ||||||
Deferred revenue | 4,492,000 | 3,425,000 | — | — | ||||||||||
Other reserves and accruals | 1,492,000 | 1,253,000 | — | — | ||||||||||
Tax credit carryforwards | — | — | 78,000 | 84,000 | ||||||||||
Property, plant and equipment | 1,624,000 | 1,450,000 | 464,000 | 504,000 | ||||||||||
Amortization of stock-based compensation | 10,623,000 | 9,183,000 | — | — | ||||||||||
Capitalized research & development expenditures | 12,816,000 | 13,775,000 | 4,777,000 | 5,195,000 | ||||||||||
Net operating loss carryforwards | 18,857,000 | 9,883,000 | 2,931,000 | 3,556,000 | ||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total deferred tax asset | 49,904,000 | 39,028,000 | 9,519,000 | 10,338,000 | ||||||||||
Valuation allowance | (40,002,000 | ) | (26,746,000 | ) | (9,519,000 | ) | (10,338,000 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net deferred tax assets | $ | 9,902,000 | $ | 12,282,000 | $ | — | $ | —  | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Intangible assets | $ | (335,000 | ) | $ | — | $ | — | $ | — | |||||
Non-employee stock based compensation | (1,556,000 | ) | (1,556,000 | ) | — | — | ||||||||
Section 382 recognized built in loss | (8,011,000 | ) | (10,726,000 | ) | —  | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net deferred tax liability | $ | (9,902,000 | ) | $ | (12,282,000 | ) | $ | — | $ | —  | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net | $ | — | $ | — | $ | — | $ | —  | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        $1.4 million of deferred tax assets and deferred tax liabilities are included within Other Non-Current Assets and Other Current Liabilities, respectively, at December 31, 2014. | ||||||||||||||
        The Company has recorded a valuation allowance, as a result of uncertainties related to the realization of its net deferred tax asset, at December 31, 2014 and 2013 of approximately $49.5 million and $37.1 million, respectively. A reconciliation of the current year change in valuation allowance is as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Total | U.S. | Foreign | ||||||||||||
Increase in valuation allowance for current year increase in net operating losses: | $ | 8,140,000 | $ | 8,974,000 | $ | (834,000 | ) | |||||||
Increase in valuation allowance for current year net increase in deferred tax assets other than net operating losses: | 4,647,000 | 4,282,000 | 365,000 | |||||||||||
Decrease in valuation allowance as a result of foreign currency fluctuation | (829,000 | (829,000 | ||||||||||||
) | — | ) | ||||||||||||
Increase in valuation allowance due to current year change of deferred tax assets as the result of uncertain tax positions. | 479,000 | — | 479,000 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Net increase (decrease) in valuation allowance | $ | 12,437,000 | $ | 13,256,000 | $ | (819,000 | ) | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        The deferred tax assets have been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforwards and other deferred tax assets may not be realized. Included in the valuation allowance at December 31, 2014 and December 31, 2013 are $0.1 million of deferred tax assets resulting from the exercise of employee stock options, which upon subsequent realization of the tax benefits, will be allocated directly to paid-in capital. | ||||||||||||||
        Before the imposition of IRC Section 382 limitations described below, at December 31, 2014, the Company has unused federal and state net operating loss carryforwards of approximately $764 million, of which $117 million was generated from the operations of acquired companies prior to the dates of acquisition and $647 million was generated by the Company subsequent to the acquisition dates and through December 31, 2014. The net operating loss carryforwards if unused will expire at various dates from 2017 through 2034. | ||||||||||||||
        Under Internal Revenue Code (IRC) Section 382, the use of loss carryforwards may be limited if a change in ownership of a company occurs. If it is determined that due to transactions involving the Company's shares owned by its 5 percent shareholders a change of ownership has occurred under the provisions of IRC Section 382, the Company's federal and state net operating loss carryforwards could be subject to significant IRC Section 382 limitations. | ||||||||||||||
        Based upon IRC Section 382 studies, Section 382 ownership changes occurred in 2013, 2012 and 2011 that resulted in $728 million of the Company's $764 million of federal and state net operating loss carryforwards being subject to IRC Section 382 limitations. As a result of IRC Section 382 limitations, $715 million of the $728 million net operating loss carryforwards that are limited will expire prior to utilization and consequently, these net operating loss carryforwards that will expire unutilized are not reflected in the Company's gross deferred tax asset as of December 31, 2014. | ||||||||||||||
        The ownership changes also resulted in net unrealized built in losses per IRS Notice 2003-65 which should result in recognized built in losses during the five year recognition period of approximately $40.7 million. This will translate into unfavorable book to tax add backs in the Company's 2014 to 2018 U.S. corporate income tax returns that resulted in a gross deferred tax liability of $8.0 million at December 31, 2014 with a corresponding reduction to the valuation allowance. This gross deferred tax liability will offset certain existing gross deferred tax assets (i.e. capitalized research expense). This has no impact on the Company's current financial position, results of operations, or cash flows because of the full valuation allowance. | ||||||||||||||
        IRC Section 382 also limits the ability for a Company to utilize research credit carryforwards. Approximately $15.6 million of research credit carryforwards are subject to IRC Section 382 limitations and as a result of the IRC Section 382 limitations, the entire $15.6 million will expire prior to utilization. | ||||||||||||||
        At December 31, 2014, the Company has unused foreign net operating loss carryforwards of approximately $12.2 million. The net operating loss carryforwards if unused will expire at various dates from 2015 through 2031. At December 31, 2014, the Company has scientific research and experimental development expenditures of $19.1 million available to offset future taxable income. These expenditures have no expiry date. At December 31, 2014, the Company has Canadian ITC credit carryforwards of $0.5 million available to offset future income tax. These credit carryforwards if unused will expire at various dates from 2015 through 2026. Approximately $0.5 million of the foreign net operating loss carryforwards and $0.4 million of the Canadian ITC credit carryforwards represent unrecognized tax benefits and are therefore, not reflected in the Company's deferred tax assets as of December 31, 2014. | ||||||||||||||
        As of December 31, 2014, the Company has no un-repatriated foreign earnings. | ||||||||||||||
        A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows: | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Unrecognized tax benefits balance at beginning of year | $ | 1,033,000 | $ | 1,579,000 | $ | 2,046,000 | ||||||||
Reductions for tax positions of prior years | (465,000 | ) | (471,000 | ) | (503,000 | ) | ||||||||
Currency Translation | (46,000 | ) | (75,000 | ) | 36,000 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Unrecognized tax benefits balance at end of year | $ | 522,000 | $ | 1,033,000 | $ | 1,579,000 | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
        The Company recognizes accrued interest and penalties related to unrecognized tax benefits as a component of income tax expense. During the year ended December 31, 2014 the Company recognized a $0.4 million benefit due to a reduction in interest and penalties as a result of the expiration of the associated statute of limitations. The Company had $0.4 million and $0.8 million of interest and penalties accrued at December 31, 2014 and December 31, 2013, respectively. | ||||||||||||||
        The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. In the normal course of business the Company is subject to examination by taxing authorities. Open tax years in the U.S. range from 2011 to 2014, and open tax years in foreign jurisdictions range from 2007 to 2014. However, upon examination in subsequent years, if net operating losses carryforwards and tax credit carryforwards are utilized, the U.S. and foreign jurisdictions can reduce net operating loss carryforwards and tax credit carryforwards utilized in the year being examined if they do not agree with the carryforward amount. As of December 31, 2014, the Company was not under audit in the U.S. or non-U.S. taxing jurisdictions. No significant changes to the amount of unrecognized tax benefits are anticipated within the next twelve months. | ||||||||||||||
Warranty_Reserve
Warranty Reserve | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Standard Product Warranty Disclosure | ||||||||
Warranty Reserve | 16. Warranty Reserve | |||||||
        The GenDrive contracts we enter into generally provide a one to two year product warranty to customers from date of installation, and the ReliOn contracts we enter into generally provide a two to five year product warranty. The Company currently estimates the costs of satisfying warranty claims based on an analysis of past experience and provides for future claims in the period the revenue is recognized. Factors that affect the warranty liability include the number of installed units, estimated material costs, estimated travel, and labor costs. | ||||||||
        The following table summarizes product warranty activity recorded during the years ended December 31, 2014 and 2013: | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Beginning balance—January 1 | $ | 1,608,131 | $ | 2,671,409 | ||||
Additions for ReliOn acquisition | 233,528 | — | ||||||
Additions for current period deliveries | 960,894 | 970,775 | ||||||
Reductions for payments made | (1,491,111 | ) | (2,034,053 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Ending balance—December 31 | $ | 1,311,442 | $ | 1,608,131 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Commitment_and_Contingencies
Commitment and Contingencies | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Commitments and Contingencies. | ||||||||
Commitments and Contingencies | 17. Commitments and Contingencies | |||||||
Operating Leases | ||||||||
        As of December 31, 2014 and 2013, the Company has several non-cancelable operating leases that expire over the next six years. Minimum rent payments under operating leases are recognized on a straight-line basis over the term of the lease. | ||||||||
        Future minimum lease payments under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) as of December 31, 2014 are: | ||||||||
                                                                                                                                                                                    | ||||||||
Year ending December 31, | ||||||||
2015 | $ | 2,984,131Â | ||||||
2016 | 3,005,307Â | |||||||
2017 | 3,061,674Â | |||||||
2018 | 3,122,828Â | |||||||
2019 | 2,877,155Â | |||||||
2020 and thereafter | 2,526,699Â | |||||||
​ | ​ | ​  | ​  | ​ | ||||
Total future minimum lease payments | $ | 17,577,794Â | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
        Rental expense and rental income for all operating leases for the years ended December 31, 2014, and 2013 were as follows: | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
Minimum rentals | $ | 1,538,513 | $ | 769,000 | ||||
Sublease rental income | (63,242 | ) | (76,104 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 1,475,271 | $ | 692,896 | |||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Sale Leaseback transactions | ||||||||
        Under a limited number of arrangements, the Company provides its products and services to customers in the form of an operating lease that can vary in term from five to six years. For these specific transactions, the Company will complete a sale-leaseback for the related assets to a financial institution for similar five to six year terms. The Company accounts for sale-leaseback transactions in accordance with Accounting Standards Codification (ASC) Subtopic 840-40, Leases—Sale-Leaseback Transactions.  | ||||||||
Hydrogen Supply Agreements | ||||||||
        The Company has entered into hydrogen supply agreements that range from six to ten years, which include monthly service charges for hydrogen maintenance, hydrogen infrastructure and hydrogen tank rentals for use at our customers' facilities. | ||||||||
Litigation | ||||||||
        During the year ended December 31, 2014, the Company accrued a $2.4 million liability relating to litigation dating back to 2008 with Soroof Trading Development Company Ltd. | ||||||||
Concentrations of credit risk | ||||||||
        Concentrations of credit risk with respect to receivables exist due to the limited number of select customers that the Company has initial commercial sales arrangements with and government agencies. To mitigate credit risk, the Company performs appropriate evaluation of a prospective customer's financial condition. | ||||||||
        At December 31, 2014, four customers comprise approximately 69.9% of the total accounts receivable balance, with each customer individually representing 30.2%, 16.0%, 13.4% and 10.3% of total accounts receivable, respectively. At December 31, 2013, five customers comprise approximately 78.3% of the total accounts receivable balance, with each customer individually representing 30.8%, 26.9%, 10.2%, 5.8% and 4.6% of total accounts receivable, respectively. | ||||||||
        For the year ended December 31, 2014, contracts with two customers comprised 37.2% of total consolidated revenues, with each customer individually representing 24.1% and 13.1% of total consolidated revenues, respectively. | ||||||||
        For the year ended December 31, 2013, contracts with three customers comprised 33.2% of total consolidated revenues, with each customer individually representing 11.6%, 11.2% and 10.4% of total consolidated revenues, respectively. | ||||||||
Employment Agreements | ||||||||
        The Company is party to employment agreements with certain executives which provide for compensation and certain other benefits. The agreements also provide for severance payments under certain circumstances. | ||||||||
Letter of Credit | ||||||||
        In September 2011, the Company signed a letter of credit with SVB in the amount of $525,000. The standby letter of credit is required by the agreement negotiated between Air Products and Chemicals, Inc., or Air Products, and us to supply hydrogen infrastructure and hydrogen to Central Grocers at their distribution center. There are no collateral requirements associated with this letter of credit. | ||||||||
Supplemental_Disclosures_of_Ca
Supplemental Disclosures of Cash Flows Information | 12 Months Ended | ||||||||||
Dec. 31, 2014 | |||||||||||
Supplemental Disclosures of Cash Flows Information | |||||||||||
Supplemental Disclosures of Cash Flows Information | 18. Supplemental Disclosures of Cash Flow Information | ||||||||||
        The following represents required supplemental disclosures of cash flow information and non-cash financing and investing activities which occurred during the years ended December 31, 2014, 2013 and 2012: | |||||||||||
                                                                                                                                                                                    | |||||||||||
2014 | 2013 | 2012 | |||||||||
Stock-based compensation accrual impact, net | $ | (103,875 | ) | $ | (31,378 | ) | $ | (10,687 | ) | ||
Cash paid for interest | 432,826 | 474,716 | 255,896 | ||||||||
Geographic_Information
Geographic Information | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Geographic Information | ||||||||
Geographic Information | 19. Geographic Information | |||||||
        The United States was the physical location of all revenue generated for the years ended December 31, 2014, 2013 and 2012. | ||||||||
        Long-lived assets, representing the sum of net book value of property, plant, and equipment, net book value of leased property under capital leases, restricted cash, note receivable, and net book value of intangible assets, based on physical location as of December 31, 2014 and 2013, are as follows: | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
United States | $ | 12,785,115Â | $ | 11,620,594Â | ||||
Canada | 350,319Â | 1,751,595Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total | $ | 13,135,434Â | $ | 13,372,189Â | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Unaudited_Quarterly_Financial_
Unaudited Quarterly Financial Data | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Unaudited Quarterly Financial Data | ||||||||||||||
Unaudited Quarterly Financial Data | 20. Unaudited Quarterly Financial Data (in thousands, except per share data) | |||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Quarters ended | ||||||||||||||
March 31, | June 30, | September 30, | December 31, | |||||||||||
2014 | 2014 | 2014 | 2014 | |||||||||||
Product revenue | $ | 3,162 | $ | 12,579 | $ | 12,595 | $ | 12,169 | ||||||
Service revenue | 2,066 | 4,415 | 6,915 | 8,410 | ||||||||||
Research and development contract revenue | 346 | 328 | 371 | 874 | ||||||||||
Net (loss) income attributable to common shareholders | (75,909 | ) | 3,825 | (9,377 | ) | (7,183 | ) | |||||||
(Loss) income per share: | ||||||||||||||
Basic and Diluted | (0.57 | ) | 0.02 | (0.06 | ) | (0.04 | ) | |||||||
                                                                                                                                                                                    | ||||||||||||||
Quarters ended | ||||||||||||||
March 31, | June 30, | September 30, | December 31, | |||||||||||
2013 | 2013 | 2013 | 2013 | |||||||||||
Product revenue | $ | 4,672 | $ | 5,581 | $ | 2,535 | $ | 5,658 | ||||||
Service revenue | 1,373 | 1,549 | 1,630 | 2,107 | ||||||||||
Research and development contract revenue | 400 | 368 | 462 | 267 | ||||||||||
Net loss attributable to common shareholders | (8,576 | ) | (9,338 | ) | (15,948 | ) | (28,929 | ) | ||||||
Loss per share: | ||||||||||||||
Basic and Diluted | (0.18 | ) | (0.14 | ) | (0.19 | ) | (0.28 | ) | ||||||
Summary_of_Significant_Account1
Summary of Significant Accounting Policies (Policies) | 12 Months Ended | ||||||||||
Dec. 31, 2014 | |||||||||||
Summary of Significant Accounting Policies | |||||||||||
Principles of Consolidation | Principles of Consolidation | ||||||||||
        The consolidated financial statements include the financial statements of Plug Power Inc. and its wholly-owned subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. | |||||||||||
Cash Equivalents | Cash Equivalents | ||||||||||
        Cash equivalents consist of money market accounts with an initial term of less than three months. For purposes of the consolidated statements of cash flows, the Company considers all highly-liquid debt instruments with original maturities of three months or less to be cash equivalents. The Company's cash and cash equivalents are deposited with financial institutions located in the U.S. and may at times exceed insured limits. | |||||||||||
Accounts Receivable | Accounts Receivable | ||||||||||
        Accounts receivable related to product and service arrangements are recorded when products are shipped or delivered to customers, as appropriate. Accounts receivable related to contract research and development arrangements are recorded as work is completed under the applicable contract. Accounts receivable are stated at the amount billed to customers and are ordinarily due between 30 and 60 days after the issuance of the invoice. Accounts are considered delinquent when more than 90 days past due, and no extended payment agreements have been granted. Receivables are reserved or written off based on individual credit evaluation and specific circumstances of the customer. The allowance for doubtful accounts and related receivable are reduced when the amount is deemed uncollectible. As of December 31, 2014 and December 31, 2013, the allowance for doubtful accounts was $0. | |||||||||||
Inventory | Inventory | ||||||||||
        Inventories are valued at the lower of cost, determined on a first-in, first-out basis, or market. In the case of our consignment arrangements, we do not relieve inventory until the customer has accepted the product, at which time the risks and rewards of ownership have transferred. At December 31, 2014 and 2013, inventory on consignment was valued at approximately $1,611,000 and $1,178,000, respectively. | |||||||||||
Intangible Assets | Intangible Assets | ||||||||||
        Intangible assets with estimable useful lives are amortized over their respective estimated useful lives to their estimated residual values, and reviewed for impairment when certain triggering events occur. Intangible assets consist of acquired technology, customer relationships and trademarks, and are amortized using a straight-line method over their useful lives of 5-10 years. | |||||||||||
Revenue Recognition | Revenue Recognition | ||||||||||
Products and Services | |||||||||||
        The Company recognizes revenue under arrangements for products and services, which may include the sale of products and related services, including revenue from installation, service and maintenance, spare parts, hydrogen fueling services, which may include hydrogen supply as well as hydrogen fueling infrastructure, and leased units. The Company also recognizes revenue under research and development contracts, which are primarily cost reimbursement contracts associated with the development of PEM fuel cell technology. | |||||||||||
        The Company enters into revenue arrangements that may contain a combination of fuel cell systems and equipment, which may be sold, or under a limited number of arrangements leased to customers, installation, service, maintenance, spare parts, hydrogen fueling and other support services. For these multiple deliverable arrangements, the Company accounts for each separate deliverable as a separate unit of accounting if the delivered item or items have value to the customer on a standalone basis. The Company considers a deliverable to have standalone value if the item is sold separately by us or another entity or if the item could be resold by the customer. The Company allocates revenue to each separate deliverable based on its relative selling price. For a majority of our deliverables, the Company determines relative selling prices using its best estimate of the selling price as vendor-specific objective evidence and third-party evidence is generally not available for the deliverables involved in its revenue arrangements due to a lack of a competitive environment in selling fuel cell technology. When determining estimated selling prices, the Company may consider the cost to produce the deliverable, the anticipated margin on that deliverable, the selling price and profit margin for similar products and services, the Company's ongoing pricing strategy and policies, the value of any enhancements that have been built into the deliverable and the characteristics of the varying markets in which the deliverable is sold, as applicable. The Company determines estimated selling prices for deliverables in its agreements based on the specific facts and circumstances of each arrangement and analyzes the estimated selling prices used for its allocation of arrangement consideration of each arrangement. | |||||||||||
        Once relative selling prices are determined, the Company proportionately allocates the sale consideration to each element of the arrangement. The allocated sales consideration related to fuel cell systems and equipment, spare parts, and hydrogen infrastructure is recognized as revenue at shipment if title and risk of loss have passed to the customer, there is persuasive evidence of an arrangement, the sales price is fixed or determinable, collection of the related receivable is reasonably assured, and customer acceptance criteria, if any, have been successfully demonstrated. The allocated sales consideration related to installation, service, maintenance, and hydrogen molecule delivery is generally recognized as revenue when completed or on a straight-line basis over the term of the contract, as appropriate. | |||||||||||
        In the case of consignment sales, the Company does not recognize revenue until the customer has accepted the product, at which time the risks and rewards of ownership have transferred, the price is fixed, and the Company has a reasonable expectation of collection upon billing. | |||||||||||
        The Company does not include a right of return on its products other than rights related to warranty provisions that permit repair or replacement of defective goods. The Company accrues for anticipated warranty costs at the same time that revenue is recognized for the related product. | |||||||||||
        The Company has also sold extended warranty contracts that generally provide for a five to ten year warranty from the date of product installation. These types of contacts are accounted for as a separate deliverable, and accordingly, revenue generated from these transactions is deferred and recognized in income over the warranty period, generally on a straight-line basis. Additionally, the Company may enter into annual service and maintenance contracts that are billed monthly. Revenue generated from these transactions is recognized in income on a straight-line basis over the term of the contract. | |||||||||||
        At December 31, 2014 and December 31, 2013, the Company had unbilled amounts from product and service revenues of approximately $616,000 and $184,000, respectively, which is included in other current assets in the accompanying consolidated balance sheets. At December 31, 2014 and December 31, 2013, the Company had deferred product and service revenues in the amount of $11.8 million and $9.0 million, respectively. | |||||||||||
Research and Development Contracts | Research and Development Contracts | ||||||||||
        Contract accounting is used for research and development contract revenue. The Company generally shares in the cost of these programs with cost sharing percentages ranging from 30% to 50% of total project costs. Revenue from time and material contracts is recognized on the basis of hours expended plus other reimbursable contract costs incurred during the period. All allowable work performed through the end of each calendar quarter is billed, subject to limitations in the respective contracts. We expect to continue research and development contract work that is directly related to our current product development efforts. At December 31, 2014 and 2013, the Company had unbilled amounts from research and development contract revenue in the amount of approximately $1,047,000 and $111,000, respectively, which is included in other current assets in the accompanying consolidated balance sheets. Unbilled amounts at December 31, 2014 are expected to be billed during the first quarter of 2015. | |||||||||||
Product Warranty Reserve | Product Warranty Reserve | ||||||||||
        The GenDrive contracts we enter into generally provide a one to two year product warranty to customers from date of installation, and the ReliOn contracts we enter into generally provide a two to five year product warranty. We currently estimate the costs of satisfying warranty claims based on an analysis of past experience and provide for future claims in the period the revenue is recognized. Factors that affect our warranty liability include the number of installed units, estimated material costs, estimated travel, and labor costs. | |||||||||||
Sale-leaseback transactions | Sale-leaseback transactions | ||||||||||
        Under a limited number of arrangements, the Company provides its products and services to customers in the form of an operating lease that can vary in term from five to six years. For these specific transactions, the Company will complete a sale-leaseback for the related assets to a financial institution for similar five to six year terms. The Company accounts for sale-leaseback transactions in accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) Subtopic 840-40, Leases—Sale-Leaseback Transactions.  | |||||||||||
Property, Plant and Equipment | Property, Plant and Equipment | ||||||||||
        Property, plant and equipment are originally recorded at cost or, if acquired as part of business combination, at fair value. Maintenance and repairs are expensed as costs are incurred. Depreciation on plant and equipment, which includes depreciation on the Company's facility that is accounted for as a financing obligation (see Note 11, Finance Obligation), is calculated on the straight-line method over the estimated useful lives of the assets. The Company records depreciation and amortization over the following estimated useful lives: | |||||||||||
                                                                                                                                                                                    | |||||||||||
Buildings | 20Â years | ||||||||||
Building improvements | 5 - 20Â years | ||||||||||
Software, machinery and equipment | 1 - 15Â years | ||||||||||
        Gains and losses resulting from the sale of property and equipment are recorded in current operations. | |||||||||||
Leased Property Under Capital Lease | Leased Property Under Capital Lease | ||||||||||
        Leased property under capital lease is stated at the present value of minimum lease payments. Amortization expense is recorded on a straight-line basis over 6 years, the shorter of the lease term and the estimated useful life of the asset. Amortization expense amounted to $516,486 and $516,487 for the years ended December 31, 2014 and December 31, 2013, respectively, and has been included in cost of service revenue in the accompanying consolidated statements of operations. | |||||||||||
Impairment of Long-Lived Assets | Impairment of Long-Lived Assets | ||||||||||
        Long-lived assets, such as property, plant, and equipment, and purchased intangibles subject to amortization, are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to estimated undiscounted future cash flows expected to be generated by the asset. If the carrying amount of an asset exceeds its estimated undiscounted future cash flows, an impairment charge is recognized by the amount by which the carrying amount of the asset exceeds the fair value of the asset. Fair value is determined through various valuation techniques, including discounted cash flow models, quoted market values and third party independent appraisals, as considered necessary. Assets to be disposed of and considered held for sale would be separately presented in the consolidated balance sheet and reported at the lower of the carrying amount or fair value less costs to sell, and are no longer depreciated. The assets and liabilities of a disposal group classified as held for sale would be presented separately in the appropriate asset and liability sections of the consolidated balance sheet. | |||||||||||
Common Stock Warrant Accounting | Common Stock Warrant Accounting | ||||||||||
        The Company accounts for common stock warrants in accordance with applicable accounting guidance provided in ASC Subtopic 815-40, Derivatives and Hedging—Contracts in Entity's Own Equity, as either derivative liabilities or as equity instruments depending on the specific terms of the warrant agreement. In compliance with applicable securities law, registered common stock warrants that require the issuance of registered shares upon exercise and do not sufficiently preclude an implied right to cash settlement are accounted for as derivative liabilities. We currently classify these derivative warrant liabilities on the accompanying consolidated balance sheets as a long-term liability, which is revalued at each balance sheet date subsequent to the initial issuance using the Black-Scholes pricing model. The Black-Scholes pricing model, which is based, in part, upon unobservable inputs for which there is little or no market data, requires the Company to develop its own assumptions. Changes in the fair value of the warrants are reflected in the accompanying consolidated statements of operations as change in fair value of common stock warrant liability. | |||||||||||
Income Taxes | Income Taxes | ||||||||||
        Income taxes are accounted for under the asset and liability method. Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax basis and operating loss and tax credit carryforwards. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates is recognized in the period that includes the enactment date. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets if it is more likely than not that such assets will not be realized. We did not report a benefit for federal and state income taxes in the consolidated financial statements as the deferred tax asset generated from our net operating loss has been offset by a full valuation allowance because it is more likely than not that the tax benefits of the net operating loss carryforward will not be realized. | |||||||||||
        The Company accounts for uncertain tax positions in accordance with FASB ASC No. 740-10-25, Income Taxes—Overall - Recognition. The Company recognizes in its consolidated financial statements the impact of a tax position only if that position is more likely than not to be sustained on audit, based on the technical merits of the position. | |||||||||||
Foreign Currency Translation | Foreign Currency Translation | ||||||||||
        Historically, foreign currency translation adjustments arose from conversion of the Company's foreign subsidiary's financial statements to U.S. dollars for reporting purposes, and were included in accumulated other comprehensive income (loss) in stockholders' equity (deficit) on the accompanying consolidated balance sheets. As of September 30, 2013, the functional currency of our last remaining foreign subsidiary, Plug Power Canada Inc., was changed to the U.S. dollar, therefore these translation adjustments will no longer occur. Transaction gains and losses resulting from the effect of exchange rate changes on transactions denominated in currencies other than the U.S. dollar give rise to realized foreign currency transaction gains and losses, and are included in interest and other expense in the accompanying consolidated statements of operations. | |||||||||||
Research and Development | Research and Development | ||||||||||
        Costs incurred in research and development by the Company are expensed as incurred. | |||||||||||
Joint Venture | Joint Venture | ||||||||||
        On February 29, 2012 we completed the formation of our joint venture with Axane, S.A., a subsidiary of Air Liquide, under the name HyPulsion (the JV). The principal purpose of the JV is to develop and sell hydrogen fuel cell systems for the European material handling market. Axane contributed in exchange for an initial 55% ownership of the JV, subject to certain conditions. We contributed to the JV the right to use our technology, including design and technology know-how on GenDrive systems, in exchange for an initial 45% ownership of the JV. We have not contributed any cash to the JV and we are not obligated to contribute any cash. | |||||||||||
        On April 19, 2013 Axane purchased an additional 25% ownership interest in HyPulsion from the Company for a cash purchase price of $3.2 million (Euro 2.5 million). We now own 20% and Axane owns 80% of HyPulsion, and we will share in 20% of the profits from the JV. The Company has the right to purchase an additional 60% of HyPulsion from Axane at any time between January 4, 2018 and January 29, 2018 at a formula price. If the Company exercises its purchase right, Axane will have the right, at any time between February 1, 2018 and December 31, 2021, to require the Company to buy the remaining 20% interest at a formula price. | |||||||||||
        In addition, the Company and HyPulsion also entered into an engineering service agreement under which, among other things, the Company will provide HyPulsion with engineering and technical services for a new fuel cell assembly line and manufacturing execution system. Under the service agreement, HyPulsion has paid the Company approximately $659,000 (Euro 500,000) in the aggregate for services to be performed by the Company. | |||||||||||
        In accordance with the equity method of accounting, the Company will increase its investment in the JV by its share of any earnings, and decrease its investment in the JV by its share of any losses. Losses in excess of the investment are not recognized and must be restored from future profits before we can recognize our proportionate share of profits. As of December 31, 2014, the Company had a zero basis for its investment in the JV. | |||||||||||
Redeemable Preferred Stock | Redeemable Preferred Stock | ||||||||||
        On May 8, 2013, the Company entered into a Securities Purchase Agreement with Air Liquide, pursuant to which the Company agreed to issue and sell 10,431 shares of the Company's Series C Redeemable Convertible Preferred Stock, par value $0.01 per share, for an aggregate purchase price of approximately $2.6 million (Euro 2 million) in cash, as more fully discussed in Note 5, Redeemable Preferred Stock. On August 26, 2014, Air Liquide acquired 5,521,676 shares of Common Stock by converting 5,200 shares of Series C Preferred Stock at the conversion price of $0.2343. Following the conversion, Air Liquide continues to own 5,231 shares of Series C Preferred Stock. We account for preferred stock as temporary equity in accordance with applicable accounting guidance in FASB ASC Topic 480, Distinguishing Liabilities from Equity. Dividends on the redeemable preferred stock are accounted for as a reduction (increase) in the net income (loss) attributable to common shareholders. | |||||||||||
Stock-Based Compensation | Stock-Based Compensation | ||||||||||
        The Company maintains employee stock-based compensation plans, which are described more fully in Note 7, Employee Benefit Plans. | |||||||||||
        Stock-based compensation represents the cost related to stock-based awards granted to employees and directors. The Company measures stock-based compensation cost at grant date, based on the fair value of the award, and recognizes the cost as expense on a straight-line basis (net of estimated forfeitures) over the option's requisite service period. | |||||||||||
        The Company estimates the fair value of stock-based awards using a Black-Scholes valuation model. Stock-based compensation expense is recorded in cost of product revenue, cost of service revenue, research and development expense and selling, general and administrative expenses in the accompanying consolidated statements of operations based on the employees' respective function. | |||||||||||
        The Company records deferred tax assets for awards that result in deductions on the Company's income tax returns, based upon the amount of compensation cost recognized and the Company's statutory tax rate. Differences between the deferred tax assets recognized for financial reporting purposes and the actual tax deduction reported on the Company's income tax return are recorded in additional paid-in capital if the tax deduction exceeds the deferred tax asset or in the consolidated statements of operations if the deferred tax asset exceeds the tax deduction and no additional paid-in capital exists from previous awards. Excess tax benefits are recognized in the period in which the tax deduction is realized through a reduction of taxes payable. No tax benefit or expense for stock-based compensation has been recorded during the years ended December 31, 2014, 2013 and 2012 since the Company remains in a NOL position. | |||||||||||
Per Share Amounts | Per Share Amounts | ||||||||||
        Basic earnings per common share are computed by dividing net loss attributable to common shareholders by the weighted average number of common shares outstanding during the reporting period. Diluted earnings per share reflects the potential dilution that could occur if securities or other contracts to issue common stock (such as stock options, unvested restricted stock, common stock warrants, and preferred stock) were exercised or converted into common stock or resulted in the issuance of common stock (net of any assumed repurchases) that then shared in the earnings of the Company, if any. This is computed by dividing net earnings by the combination of dilutive common share equivalents, which is comprised of shares issuable under outstanding warrants, the conversion of preferred stock, and the Company's share-based compensation plans, and the weighted average number of common shares outstanding during the reporting period. Since the Company is in a net loss position, all common stock equivalents would be considered to be anti-dilutive and are, therefore, not included in the determination of diluted earnings per share. Accordingly, basic and diluted loss per share are the same. | |||||||||||
        The following table provides the components of the calculations of basic and diluted earnings per share: | |||||||||||
                                                                                                                                                                                    | |||||||||||
Year Ended December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Numerator: | |||||||||||
Net loss attributable to common shareholders | $ | (88,643,700 | ) | $ | (62,790,800 | ) | $ | (31,862,454 | ) | ||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Denominator: | |||||||||||
Weighted average number of common shares outstanding | 159,228,815 | 76,436,408 | 34,376,427 | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The dilutive potential common shares are summarized as follows: | |||||||||||
                                                                                                                                                                                    | |||||||||||
At December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Stock options outstanding | 8,367,271Â | 4,703,326Â | 1,986,255Â | ||||||||
Restricted stock outstanding | 473,336 | 650,002 | — | ||||||||
Common stock warrants(1) | 4,219,442Â | 24,137,878Â | 9,421,008Â | ||||||||
Preferred stock(2) | 5,554,594 | 10,972,859 | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Number of dilutive potential common shares | 18,614,643Â | 40,464,065Â | 11,407,263Â | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
-1 | In May 2011, the Company issued 7,128,563 warrants as part of an underwritten public offering. As a result of additional public offerings, and pursuant to the effect of the anti-dilution provisions of these warrants, the number of warrants increased to 22,995,365. Of the warrants issued in May 2011, 22,776,023 have been exercised as of December 31, 2014. In February 2013, the Company issued 23,637,500 warrants as part of an underwritten public offering. Of the warrants issued in February 2013, 23,637,400 were exercised as of December 31, 2014. In January 2014, the Company issued 4,000,000 warrants as part of an underwritten public offering. Of the warrants issued in January 2014, none have been exercised as of December 31, 2014. As of December 31, 2014, the remaining 4,219,442 warrants have a weighted average exercise price of $3.84.  | ||||||||||
-2 | The preferred stock amount represents the dilutive potential common shares of the Series C redeemable convertible preferred stock issued on May 16, 2013 based on the conversion price of the preferred stock as of December 31, 2014. Of the 10,431 preferred shares issued in May 2013, 5,200 had been converted to common stock as of December 31, 2014. | ||||||||||
Use of Estimates | Use of Estimates | ||||||||||
        The consolidated financial statements of the Company have been prepared in conformity with U.S. generally accepted accounting principles, which require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. | |||||||||||
Reclassifications | Reclassifications | ||||||||||
        Certain reclassifications have been made to prior period financial statements to conform to the current period presentation. These reclassifications did not impact the results of operations or net cash flows in the periods presented. | |||||||||||
Subsequent Events | Subsequent Events | ||||||||||
        The Company evaluates subsequent events at the date of the balance sheet as well as conditions that arise after the balance sheet date but before the consolidated financial statements are issued. The effects of conditions that existed at the balance sheet date are recognized in the consolidated financial statements. Events and conditions arising after the balance sheet date but before the consolidated financial statements are issued are evaluated to determine if disclosure is required to keep the consolidated financial statements from being misleading. To the extent such events and conditions exist, if any, disclosures are made regarding the nature of events and the estimated financial effects for those events and conditions. | |||||||||||
Recent Accounting Pronouncements | Recent Accounting Pronouncements | ||||||||||
        On May 28, 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers, which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. The ASU will replace most existing revenue recognition guidance in U.S. GAAP when it becomes effective. The new standard is effective for the Company on January 1, 2017. Early application is not permitted. The standard permits the use of either the retrospective or cumulative effect transition method. The Company is evaluating the effect that ASU 2014-09 will have on its consolidated financial statements and related disclosures. The Company has not yet selected a transition method nor has it determined the effect of the standard on its ongoing financial reporting. | |||||||||||
Summary_of_Significant_Account2
Summary of Significant Accounting Policies (Tables) | 12 Months Ended | ||||||||||
Dec. 31, 2014 | |||||||||||
Summary of Significant Accounting Policies | |||||||||||
Schedule of Property Plant and Equipment Useful Lives | |||||||||||
                                                                                                                                                                                    | |||||||||||
Buildings | 20Â years | ||||||||||
Building improvements | 5 - 20Â years | ||||||||||
Software, machinery and equipment | 1 - 15Â years | ||||||||||
Schedule of components of the calculations of basic and diluted earnings per share: | |||||||||||
                                                                                                                                                                                    | |||||||||||
Year Ended December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Numerator: | |||||||||||
Net loss attributable to common shareholders | $ | (88,643,700 | ) | $ | (62,790,800 | ) | $ | (31,862,454 | ) | ||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Denominator: | |||||||||||
Weighted average number of common shares outstanding | 159,228,815 | 76,436,408 | 34,376,427 | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Schedule of dilutive potential common shares | |||||||||||
                                                                                                                                                                                    | |||||||||||
At December 31, | |||||||||||
2014 | 2013 | 2012 | |||||||||
Stock options outstanding | 8,367,271Â | 4,703,326Â | 1,986,255Â | ||||||||
Restricted stock outstanding | 473,336 | 650,002 | — | ||||||||
Common stock warrants(1) | 4,219,442Â | 24,137,878Â | 9,421,008Â | ||||||||
Preferred stock(2) | 5,554,594 | 10,972,859 | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Number of dilutive potential common shares | 18,614,643Â | 40,464,065Â | 11,407,263Â | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
-1 | In May 2011, the Company issued 7,128,563 warrants as part of an underwritten public offering. As a result of additional public offerings, and pursuant to the effect of the anti-dilution provisions of these warrants, the number of warrants increased to 22,995,365. Of the warrants issued in May 2011, 22,776,023 have been exercised as of December 31, 2014. In February 2013, the Company issued 23,637,500 warrants as part of an underwritten public offering. Of the warrants issued in February 2013, 23,637,400 were exercised as of December 31, 2014. In January 2014, the Company issued 4,000,000 warrants as part of an underwritten public offering. Of the warrants issued in January 2014, none have been exercised as of December 31, 2014. As of December 31, 2014, the remaining 4,219,442 warrants have a weighted average exercise price of $3.84. | ||||||||||
-2 | The preferred stock amount represents the dilutive potential common shares of the Series C redeemable convertible preferred stock issued on May 16, 2013 based on the conversion price of the preferred stock as of December 31, 2014. Of the 10,431 preferred shares issued in May 2013, 5,200 had been converted to common stock as of December 31, 2014. | ||||||||||
Acquisition_of_ReliOn_Inc_Tabl
Acquisition of ReliOn Inc (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Acquisition of ReliOn Inc. | ||||||||
Summary of preliminary allocation of the purchase price to the estimated fair value of the net assets acquired | ||||||||
                                                                                                                                                                                    | ||||||||
Cash and cash equivalents | $ | 414,000 | ||||||
Accounts receivable | 315,975 | |||||||
Inventory | 5,161,223 | |||||||
Prepaid expenses and other assets | 88,894 | |||||||
Property and equipment | 162,990 | |||||||
Identifiable intangibles | 980,000 | |||||||
Accounts payable and accrued expenses | (1,682,782 | ) | ||||||
Note payable | (426,044 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ||||
Total Net Assets Acquired | $ | 5,014,256 | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
Gain on bargain purchase | (1,014,256 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ||||
Acquisition consideration | $ | 4,000,000 | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
Schedule of unaudited pro forma financial information | ||||||||
                                                                                                                                                                                    | ||||||||
Year ended | Year ended | |||||||
December 31, 2014 | December 31, 2013 | |||||||
Revenue | $ | 65,361,494 | $ | 31,190,848 | ||||
Net loss attributable to the Company | (88,925,977 | ) | (69,645,886 | ) | ||||
Basic and diluted loss per share | $ | (0.56 | ) | $ | (0.90 | ) | ||
Inventory_Tables
Inventory (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Inventory. | ||||||||
Schedule of Inventory | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | |||||||
December 31, 2014 | December 31, 2013 | |||||||
Raw materials and supplies | $ | 18,501,386Â | $ | 8,881,596Â | ||||
Work-in-process | 237,268Â | 219,327Â | ||||||
Finished goods | 5,996,947Â | 1,305,397Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 24,735,601Â | $ | 10,406,320Â | |||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Employee_Benefit_Plans_Tables
Employee Benefit Plans (Tables) | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Employee Benefit Plans | ||||||||||||||
Assumptions made for the purpose of estimating fair value | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Dividend yield: | 0% | 0% | 0% | |||||||||||
Expected term of options (years): | 6 | 6 | 6 | |||||||||||
Risk free interest rate: | 1.77% - 1.94% | 0.93% - 1.70% | 0.80% - 1.16% | |||||||||||
Volatility: | 107% - 114% | 92% - 107% | 80% | |||||||||||
Schedule of Share-based Compensation, Stock Options, Activity | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Shares | Weighted | Weighted | Aggregate | |||||||||||
Average | Average | Instrinsic | ||||||||||||
Exercise | Remaining | Value | ||||||||||||
Price | Contractual | |||||||||||||
Terms | ||||||||||||||
Options outstanding at December 31, 2013 | 4,703,326 | $ | 3.22 | 8.7 | ||||||||||
Granted | 4,246,000 | 4.86 | ||||||||||||
Exercised | (417,852 | ) | 0.97 | |||||||||||
Forfeited | (143,053 | ) | 5.25 | |||||||||||
Expired | (21,150 | ) | 77.22 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | |
Options outstanding at December 31, 2014 | 8,367,271 | $ | 3.94 | 8.7 | 7,865,235 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​ | ​ | ​ | ​ | ​ | ​  | |
Options exercisable at December 31, 2014 | 2,266,607 | 5.16 | 7 | 4,895,871 | ||||||||||
Options unvested at December 31, 2014 | 6,100,664 | $ | 3.49 | 9.3 | 2,989,325 | |||||||||
Nonvested Restricted Stock Shares Activity | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Shares | Aggregate | |||||||||||||
Instrinsic | ||||||||||||||
Value | ||||||||||||||
Unvested restricted stock at December 31, 2013 | 650,002 | |||||||||||||
Granted | 40,000 | |||||||||||||
Vested | (216,666 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |||||||
Unvested restricted stock at December 31, 2014 | 473,336 | $ | 1,420,008 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |||||||
Property_Plant_and_Equipment_T
Property, Plant and Equipment (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Property, Plant and Equipment. | ||||||||
Schedule of Property plant and equipment | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Land | $ | 90,000 | $ | 90,000 | ||||
Buildings | 15,332,232 | 15,332,232 | ||||||
Building improvements | 5,031,803 | 4,923,827 | ||||||
Software, machinery and equipment | 11,396,627 | 10,658,236 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
31,850,662 | 31,004,295 | |||||||
Less accumulated depreciation | (26,538,755 | ) | (25,726,628 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Property, plant, and equipment, net | $ | 5,311,907 | $ | 5,277,667 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Capital_Lease_Tables
Capital Lease (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Capital Lease | ||||||||
Schedule of Capital Leased Assets | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Leased property under capital lease | $ | 3,098,921 | $ | 3,098,921 | ||||
Less accumulated depreciation | (1,162,095 | ) | (645,609 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Leased property under capital lease, net | $ | 1,936,826 | $ | 2,453,312 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Finance_Obligation_Tables
Finance Obligation (Tables) | 12 Months Ended | ||||
Dec. 31, 2014 | |||||
Finance Obligation. | |||||
Schedule of Future Minimum Lease Payments for Capital Leases | |||||
                                                                                                                                                                                    | |||||
2015 | $ | 459,566Â | |||
2016 | 459,566Â | ||||
2017 | 459,566Â | ||||
2018 | 486,467Â | ||||
2019 | 494,918Â | ||||
Thereafter | 4,254,405Â | ||||
​ | ​ | ​  | ​  | ​ | |
Total future minimum financing obligation payments | $ | 6,614,488Â | |||
Less interest | 2,508,417Â | ||||
​ | ​ | ​  | ​  | ​ | |
Present value of future minimum financing obligation payments | $ | 4,106,071Â | |||
​ | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​  | |
Intangible_Assets_Tables
Intangible Assets (Tables) | 12 Months Ended | ||||||||||||
Dec. 31, 2014 | |||||||||||||
Schedule of Intangible assets: | |||||||||||||
Schedule of finite-lived intangible assets | |||||||||||||
        The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2014 are as follows: | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
Weighted | Gross Carrying | Accumulated | Total | ||||||||||
Average | Amount | Amortization | |||||||||||
Amortization | |||||||||||||
Period | |||||||||||||
Acquired technology | 8Â years | $ | 17,696,835 | $ | (16,539,683 | ) | $ | 1,157,152 | |||||
Customer relationships | 8Â years | 1,260,000 | (977,833 | ) | 282,167 | ||||||||
Trademark | 5Â years | 60,000 | (9,000 | ) | 51,000 | ||||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 19,016,835 | $ | (17,526,516 | ) | $ | 1,490,319 | |||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
        The gross carrying amount and accumulated amortization of the Company's acquired identifiable intangible assets as of December 31, 2013 are as follows: | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
Weighted | Gross Carrying | Accumulated | Total | ||||||||||
Average | Amount | Amortization | |||||||||||
Amortization | |||||||||||||
Period | |||||||||||||
Acquired technology | 8Â years | $ | 17,036,835 | $ | (14,301,907 | ) | $ | 2,734,928 | |||||
Customer relationships | 8Â years | 1,000,000 | (833,333 | ) | 166,667 | ||||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 18,036,835 | $ | (15,135,240 | ) | $ | 2,901,595 | |||||||
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Schedule of future amortization of intangible assets | |||||||||||||
                                                                                                                                                                                    | |||||||||||||
2015 | $ | 807,819Â | |||||||||||
2016 | 170,000Â | ||||||||||||
2017 | 170,000Â | ||||||||||||
2018 | 170,000Â | ||||||||||||
2019 | 62,000Â | ||||||||||||
Thereafter | 110,500Â | ||||||||||||
​ | ​ | ​  | ​  | ​ | |||||||||
Total | $ | 1,490,319Â | |||||||||||
​ | ​ | ​  | ​  | ​ | |||||||||
​ | ​ | ​  | ​  | ​  | |||||||||
Accrued_Expenses_Tables
Accrued Expenses (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Accrued Expenses | ||||||||
Schedule of Accrued Expenses | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
Accrued payroll and compensation related costs | $ | 2,517,327Â | $ | 1,531,175Â | ||||
Accrued dealer commissions and customer rebates | 621,340Â | 235,690Â | ||||||
Accrued accounts payable | 5,610,689Â | 1,301,909Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total | $ | 8,749,356Â | $ | 3,068,774Â | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Fair_Value_Tables
Fair Value (Tables) | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Fair Value Measurements. | ||||||||||||||
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Balance at December 31, 2014 | Total | Quoted Prices | Significant | Significant | ||||||||||
in Active | Other | Other | ||||||||||||
Markets for | Observable | Unobservable | ||||||||||||
Identical Items | Inputs | Inputs | ||||||||||||
(Level 1) | (Level 2) | (Level 3) | ||||||||||||
Common stock warrant liability | $ | 9,418,413 | $ | — | $ | — | $ | 9,418,413 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
                                                                                                                                                                                    | ||||||||||||||
Balance at December 31, 2013 | Total | Quoted Prices | Significant | Significant | ||||||||||
in Active | Other | Other | ||||||||||||
Markets for | Observable | Unobservable | ||||||||||||
Identical Items | Inputs | Inputs | ||||||||||||
(Level 1) | (Level 2) | (Level 3) | ||||||||||||
Common stock warrant liability | $ | 28,829,849 | $ | — | $ | — | $ | 28,829,849 | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Common stock warrant liability | Fair Value | |||||||||||||
Measurement | ||||||||||||||
Using Significant | ||||||||||||||
Unobservable | ||||||||||||||
Inputs | ||||||||||||||
Beginning of period—January 1, 2014 | $ | 28,829,849 | ||||||||||||
Change in fair value of common stock warrants | 52,259,898 | |||||||||||||
Issuance of common stock warrants | 11,773,240 | |||||||||||||
Exercise of common stock warrants | (83,444,574 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
Fair value of common stock warrant liability at December 31, 2014 | $ | 9,418,413 | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
​ | ​ | ​  | ​  | ​  | ||||||||||
                                                                                                                                                                                    | ||||||||||||||
Common stock warrant liability | Fair Value | |||||||||||||
Measurement | ||||||||||||||
Using Significant | ||||||||||||||
Unobservable | ||||||||||||||
Inputs | ||||||||||||||
Beginning of period—January 1, 2013 | $ | 475,825 | ||||||||||||
Change in fair value of common stock warrants | 37,101,818 | |||||||||||||
Issuance of common stock warrants | 2,451,028 | |||||||||||||
Exercise of common stock warrants | (11,198,822 | ) | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
Fair value of common stock warrant liability at December 31, 2013 | $ | 28,829,849 | ||||||||||||
​ | ​ | ​  | ​  | ​ | ||||||||||
​ | ​ | ​  | ​  | ​  | ||||||||||
Income_Taxes_Tables
Income Taxes (Tables) | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Income Taxes. | ||||||||||||||
Schedule of the Components of Loss Before Income Taxes | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
United States | $ | (87,458,000 | ) | $ | (61,730,000 | ) | $ | (30,399,000 | ) | |||||
Foreign | (1,354,000 | ) | (1,350,000 | ) | (1,463,000 | ) | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
$ | (88,812,000 | ) | $ | (63,080,000 | ) | $ | (31,862,000 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Components of Income Tax Expense (Benefit) | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
United States | $ | — | $ | — | $ | — | ||||||||
Foreign | (325,000 | ) | (410,000 | ) | —  | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
$ | (325,000 | ) | $ | (410,000 | ) | $ | —  | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Significant Components of U.S. Deferred Income Taxes | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Deferred tax (benefit) expense | $ | (4,282,000 | ) | $ | (3,209,000 | ) | $ | 10,661,000 | ||||||
Net operating loss carryforward (generated) expired | (8,974,000 | ) | (6,536,000 | ) | 26,924,000 | |||||||||
Valuation allowance increase (decrease) | 13,256,000 | 9,745,000 | (37,585,000 | ) | ||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Provision for income taxes | $ | — | $ | — | $ | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Significant Components of Foreign Deferred Income Taxes | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Deferred tax expense (benefit) | $ | 194,000 | $ | 1,406,000 | $ | (1,041,000 | ) | |||||||
Net operating loss carryforward expired (generated) | 625,000 | (15,000 | ) | (79,000 | ) | |||||||||
Valuation allowance (decrease) increase | (819,000 | ) | (1,391,000 | ) | 1,120,000 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Provision for income taxes | $ | — | $ | — | $ | —  | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Effective Income Tax Rate Reconciliation | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
U.S. Federal statutory tax rate | (35.0Â | )% | (35.0Â | )% | (35.0Â | )% | ||||||||
Deferred state taxes, net of federal benefit | (1.2Â | )% | (1.3Â | )% | (3.3Â | )% | ||||||||
Common stock warrant liability | 20.6Â | % | 20.6Â | % | (5.3Â | )% | ||||||||
Gain on Hypulsion transaction | 0.0Â | % | (1.8Â | )% | 0.0Â | % | ||||||||
Bargain purchase gain—ReliOn | (0.4 | )% | 0.0 | % | 0.0 | % | ||||||||
Other, net | 0.1Â | % | 0.1Â | % | 0.1Â | % | ||||||||
Change to uncertain tax positions | (0.9Â | )% | (1.3Â | )% | (1.6Â | )% | ||||||||
Foreign tax rate differential | 0.2Â | % | 0.2Â | % | 0.5Â | % | ||||||||
Expiring attribute carryforward | 0.8Â | % | 2.2Â | % | 0.0Â | % | ||||||||
Adjustments to open deferred tax balance | 0.0Â | % | (0.3Â | )% | (5.8Â | )% | ||||||||
Writeoff of tax attributes due to imposition of Section 382 limitation | 0.0 | % | 1.5 | % | 165.7 | % | ||||||||
Change in valuation allowance | 15.4Â | % | 14.5Â | % | (115.3Â | )% | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
(0.4Â | )% | (0.6Â | )% | 0.0Â | % Â | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Deferred Tax Assets and Liabilities | Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â | |||||||||||||
U.S. Years ended December 31, | Foreign Years ended | |||||||||||||
December 31, | ||||||||||||||
2014 | 2013 | 2014 | 2013 | |||||||||||
Intangible assets | $ | — | $ | 59,000 | $ | 1,269,000 | $ | 999,000 | ||||||
Deferred revenue | 4,492,000 | 3,425,000 | — | — | ||||||||||
Other reserves and accruals | 1,492,000 | 1,253,000 | — | — | ||||||||||
Tax credit carryforwards | — | — | 78,000 | 84,000 | ||||||||||
Property, plant and equipment | 1,624,000 | 1,450,000 | 464,000 | 504,000 | ||||||||||
Amortization of stock-based compensation | 10,623,000 | 9,183,000 | — | — | ||||||||||
Capitalized research & development expenditures | 12,816,000 | 13,775,000 | 4,777,000 | 5,195,000 | ||||||||||
Net operating loss carryforwards | 18,857,000 | 9,883,000 | 2,931,000 | 3,556,000 | ||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total deferred tax asset | 49,904,000 | 39,028,000 | 9,519,000 | 10,338,000 | ||||||||||
Valuation allowance | (40,002,000 | ) | (26,746,000 | ) | (9,519,000 | ) | (10,338,000 | ) | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net deferred tax assets | $ | 9,902,000 | $ | 12,282,000 | $ | — | $ | —  | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Intangible assets | $ | (335,000 | ) | $ | — | $ | — | $ | — | |||||
Non-employee stock based compensation | (1,556,000 | ) | (1,556,000 | ) | — | — | ||||||||
Section 382 recognized built in loss | (8,011,000 | ) | (10,726,000 | ) | —  | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net deferred tax liability | $ | (9,902,000 | ) | $ | (12,282,000 | ) | $ | — | $ | —  | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Net | $ | — | $ | — | $ | — | $ | —  | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Schedule of Valuation Allowance | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Total | U.S. | Foreign | ||||||||||||
Increase in valuation allowance for current year increase in net operating losses: | $ | 8,140,000 | $ | 8,974,000 | $ | (834,000 | ) | |||||||
Increase in valuation allowance for current year net increase in deferred tax assets other than net operating losses: | 4,647,000 | 4,282,000 | 365,000 | |||||||||||
Decrease in valuation allowance as a result of foreign currency fluctuation | (829,000 | (829,000 | ||||||||||||
) | — | ) | ||||||||||||
Increase in valuation allowance due to current year change of deferred tax assets as the result of uncertain tax positions. | 479,000 | — | 479,000 | |||||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Net increase (decrease) in valuation allowance | $ | 12,437,000 | $ | 13,256,000 | $ | (819,000 | ) | |||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Schedule of Unrecognized Tax Benefits | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
2014 | 2013 | 2012 | ||||||||||||
Unrecognized tax benefits balance at beginning of year | $ | 1,033,000 | $ | 1,579,000 | $ | 2,046,000 | ||||||||
Reductions for tax positions of prior years | (465,000 | ) | (471,000 | ) | (503,000 | ) | ||||||||
Currency Translation | (46,000 | ) | (75,000 | ) | 36,000 | |||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
Unrecognized tax benefits balance at end of year | $ | 522,000 | $ | 1,033,000 | $ | 1,579,000 | ||||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | ​  | ​  | ​  | ||||
Warranty_Reserve_Tables
Warranty Reserve (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Warranty Reserve. | ||||||||
Schedule of Product Warranty | ||||||||
                                                                                                                                                                                    | ||||||||
December 31, | December 31, | |||||||
2014 | 2013 | |||||||
Beginning balance—January 1 | $ | 1,608,131 | $ | 2,671,409 | ||||
Additions for ReliOn acquisition | 233,528 | — | ||||||
Additions for current period deliveries | 960,894 | 970,775 | ||||||
Reductions for payments made | (1,491,111 | ) | (2,034,053 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Ending balance—December 31 | $ | 1,311,442 | $ | 1,608,131 | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Commitment_and_Contingencies_T
Commitment and Contingencies (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Commitments and Contingencies. | ||||||||
Schedule of Future Minimum Rental Payments for Operating Leases | ||||||||
        Future minimum lease payments under non-cancelable operating leases (with initial or remaining lease terms in excess of one year) as of December 31, 2014 are: | ||||||||
                                                                                                                                                                                    | ||||||||
Year ending December 31, | ||||||||
2015 | $ | 2,984,131Â | ||||||
2016 | 3,005,307Â | |||||||
2017 | 3,061,674Â | |||||||
2018 | 3,122,828Â | |||||||
2019 | 2,877,155Â | |||||||
2020 and thereafter | 2,526,699Â | |||||||
​ | ​ | ​  | ​  | ​ | ||||
Total future minimum lease payments | $ | 17,577,794Â | ||||||
​ | ​ | ​  | ​  | ​ | ||||
​ | ​ | ​  | ​  | ​  | ||||
Schedule of Rent Expense | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
Minimum rentals | $ | 1,538,513 | $ | 769,000 | ||||
Sublease rental income | (63,242 | ) | (76,104 | ) | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
$ | 1,475,271 | $ | 692,896 | |||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Schedule_of_supplemental_discl
Schedule of supplemental disclosures of cash flows information (Tables) | 12 Months Ended | ||||||||||
Dec. 31, 2014 | |||||||||||
Supplemental Disclosures of Cash Flows Information | |||||||||||
Schedule of supplemental disclosures of cash flow information | |||||||||||
                                                                                                                                                                                    | |||||||||||
2014 | 2013 | 2012 | |||||||||
Stock-based compensation accrual impact, net | $ | (103,875 | ) | $ | (31,378 | ) | $ | (10,687 | ) | ||
Cash paid for interest | 432,826 | 474,716 | 255,896 | ||||||||
Geographic_Information_Tables
Geographic Information (Tables) | 12 Months Ended | |||||||
Dec. 31, 2014 | ||||||||
Geographic Information | ||||||||
Schedule of Geographic Information | ||||||||
                                                                                                                                                                                    | ||||||||
2014 | 2013 | |||||||
United States | $ | 12,785,115Â | $ | 11,620,594Â | ||||
Canada | 350,319Â | 1,751,595Â | ||||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
Total | $ | 13,135,434Â | $ | 13,372,189Â | ||||
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​ | |
​ | ​ | ​  | ​  | ​ | ​  | ​  | ​  | |
Unaudited_Quarterly_Financial_1
Unaudited Quarterly Financial Data (Tables) | 12 Months Ended | |||||||||||||
Dec. 31, 2014 | ||||||||||||||
Unaudited Quarterly Financial Data | ||||||||||||||
Schedule of Quarterly Financial Information | ||||||||||||||
                                                                                                                                                                                    | ||||||||||||||
Quarters ended | ||||||||||||||
March 31, | June 30, | September 30, | December 31, | |||||||||||
2014 | 2014 | 2014 | 2014 | |||||||||||
Product revenue | $ | 3,162 | $ | 12,579 | $ | 12,595 | $ | 12,169 | ||||||
Service revenue | 2,066 | 4,415 | 6,915 | 8,410 | ||||||||||
Research and development contract revenue | 346 | 328 | 371 | 874 | ||||||||||
Net (loss) income attributable to common shareholders | (75,909 | ) | 3,825 | (9,377 | ) | (7,183 | ) | |||||||
(Loss) income per share: | ||||||||||||||
Basic and Diluted | (0.57 | ) | 0.02 | (0.06 | ) | (0.04 | ) | |||||||
                                                                                                                                                                                    | ||||||||||||||
Quarters ended | ||||||||||||||
March 31, | June 30, | September 30, | December 31, | |||||||||||
2013 | 2013 | 2013 | 2013 | |||||||||||
Product revenue | $ | 4,672 | $ | 5,581 | $ | 2,535 | $ | 5,658 | ||||||
Service revenue | 1,373 | 1,549 | 1,630 | 2,107 | ||||||||||
Research and development contract revenue | 400 | 368 | 462 | 267 | ||||||||||
Net loss attributable to common shareholders | (8,576 | ) | (9,338 | ) | (15,948 | ) | (28,929 | ) | ||||||
Loss per share: | ||||||||||||||
Basic and Diluted | (0.18 | ) | (0.14 | ) | (0.19 | ) | (0.28 | ) | ||||||
Nature_of_Operations_Details
Nature of Operations (Details) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 02, 2014 | Dec. 31, 2011 | |
Description of Business | |||||||||||||
Net loss attributable to common shareholders | $7,183,000 | $9,377,000 | ($3,825,000) | $75,909,000 | $28,929,000 | $15,948,000 | $9,338,000 | $8,576,000 | $88,643,700 | $62,790,800 | $31,862,454 | ||
Cash and cash equivalents | 146,205,071 | 5,026,523 | 146,205,071 | 5,026,523 | 9,380,059 | 13,856,893 | |||||||
Accumulated deficit | 938,080,766 | 849,437,066 | 938,080,766 | 849,437,066 | |||||||||
Net cash used in operating activities | 40,779,534 | 26,880,811 | 20,164,996 | ||||||||||
Net working capital | $167,000,000 | $11,100,000 | $167,000,000 | $11,100,000 | |||||||||
ReliOn | |||||||||||||
Description of Business | |||||||||||||
Number of shares of common stock issued | 530,504 | ||||||||||||
Share price (in dollars per share) | $7.54 |
Nature_of_Operations_Details_2
Nature of Operations (Details 2) (USD $) | 0 Months Ended | 12 Months Ended | |
Apr. 30, 2014 | Mar. 11, 2014 | Dec. 31, 2014 | |
Nature Of Operations. | |||
Gross proceeds from shares of common stock sold in an underwritten public offering | $124,300,000 | $22,400,006 | $176,700,000 |
Net proceeds, after underwriting discounts and commissions and other estimated fees expenses in millions | 165,700,000 | ||
Received an additional amount from the exercise of previously issued common stock warrants in millions | $18,300,000 | ||
Minimum period for which we believe that our current cash, cash equivalents, cash generated from future sales, and cash generated from the exercise of outstanding warrants will provide sufficient liquidity to fund operations | 12 months |
Summary_of_Significant_Account3
Summary of Significant Accounting Policies (Details) (USD $) | 12 Months Ended | |
Dec. 31, 2014 | Dec. 31, 2013 | |
Accounts Receivable | ||
Minimum number of days after an invoice is issued when accounts receivable is considered due | 30 days | |
Maximum number of days after an invoice is issued when accounts receivable is considered due | 60 days | |
Number of days past due when accounts receivable are considered delinquent | 90 days | |
Allowance for doubtful accounts receivable | $0 | $0 |
Inventory | ||
Inventory on consignment | 1,611,000 | 1,178,000 |
Revenue Recognition | ||
Minimum term of extended warranty contracts sold | 5 years | |
Maximum term of extended warranty contracts sold | 10 years | |
Deferred product and service revenues | 11,800,000 | 9,000,000 |
Leased Property Under Capital Lease | ||
Amortization period of capital lease | 6 years | |
Amortization expense of property under capital leases | 516,486 | 516,487 |
Minimum | ||
Intangible Assets | ||
Intangible asset useful lives | 5 years | |
Research and Development Contracts | ||
Cost Sharing Percentages of research and development contracts | 0.3 | |
Sale-leaseback transactions | ||
Lease Term | 5 years | |
Maximum | ||
Intangible Assets | ||
Intangible asset useful lives | 10 years | |
Research and Development Contracts | ||
Cost Sharing Percentages of research and development contracts | 0.5 | |
Sale-leaseback transactions | ||
Lease Term | 6 years | |
Products and Services Arrangements | ||
Revenue Recognition | ||
Unbilled amounts | 616,000 | 184,000 |
Research and Development Contracts | ||
Revenue Recognition | ||
Unbilled amounts | $1,047,000 | $111,000 |
Buildings. | ||
Property, Plant and Equipment. | ||
Estimated useful life | 20 years | |
Building improvements | Minimum | ||
Property, Plant and Equipment. | ||
Estimated useful life | 5 years | |
Building improvements | Maximum | ||
Property, Plant and Equipment. | ||
Estimated useful life | 20 years | |
Software, machinery and equipment | Minimum | ||
Property, Plant and Equipment. | ||
Estimated useful life | 1 year | |
Software, machinery and equipment | Maximum | ||
Property, Plant and Equipment. | ||
Estimated useful life | 15 years |
Summary_of_Significant_Account4
Summary of Significant Accounting Policies (Details 2) (HyPulsion) | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||
Dec. 31, 2014 | Feb. 29, 2012 | Apr. 19, 2013 | Apr. 19, 2013 | Dec. 31, 2014 | Apr. 19, 2013 | Feb. 29, 2012 | Dec. 31, 2014 | Dec. 31, 2014 | |
USD ($) | Axane, S.A. | Axane, S.A. | Axane, S.A. | Axane, S.A. | Axane, S.A. | Engineering Service Agreement | Engineering Service Agreement | ||
USD ($) | EUR (€) | USD ($) | EUR (€) | ||||||
Joint Venture | |||||||||
Ownership interest percentage | 20.00% | 45.00% | 80.00% | 55.00% | |||||
Additional ownership interest purchased by counterparty from the Company | 25.00% | ||||||||
Cash purchase price of interest in JV | $3,200,000 | € 2,500,000 | |||||||
Percentage of share in profits of joint venture | 20.00% | ||||||||
Additional ownership interest that can be purchased by entity from counterparty at any time between January 4, 2018 and January 29, 2018 at a formula price | 60.00% | ||||||||
Remaining ownership interest to be acquired by Company upon exercise of its purchase right | 20.00% | ||||||||
Payments made by JV for services to be performed | 659,000 | 500,000 | |||||||
Investment in JV | $0 |
Summary_of_Significant_Account5
Summary of Significant Accounting Policies (Details 3) | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Aug. 26, 2014 | 8-May-13 | 8-May-13 | Dec. 31, 2014 | Aug. 26, 2014 | 8-May-13 | Aug. 26, 2014 |
USD ($) | USD ($) | Common Stock | Air Liquide | Air Liquide | Air Liquide | Air Liquide | Air Liquide | Air Liquide | Air Liquide | |
Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | ||||
USD ($) | EUR (€) | USD ($) | USD ($) | Common Stock | ||||||
Redeemable preferred stock | ||||||||||
Redeemable stock issued (in shares) | 5,231 | 10,431 | 5,231 | 10,431 | ||||||
Redeemable stock issued, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | |||||||
Aggregate purchase price of shares issued | $2,595,400 | € 2,000,000 | ||||||||
Shares issued upon conversion of redeemable stock (in shares) | 5,521,676 | -5,200 | 5,521,676 | |||||||
Conversion price per share (in dollars per share) | $0.23 |
Summary_of_Significant_Account6
Summary of Significant Accounting Policies (Details 4) (USD $) | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | |||||||||||
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | 31-May-11 | Dec. 31, 2011 | Feb. 28, 2013 | Jan. 31, 2014 | Jan. 15, 2014 | |
Stock-Based Compensation | ||||||||||||||||
Tax benefit (expense) for stock-based compensation | $0 | $0 | $0 | |||||||||||||
Numerator | ||||||||||||||||
Net loss attributable to common shareholders | ($7,183,000) | ($9,377,000) | $3,825,000 | ($75,909,000) | ($28,929,000) | ($15,948,000) | ($9,338,000) | ($8,576,000) | ($88,643,700) | ($62,790,800) | ($31,862,454) | |||||
Denominator | ||||||||||||||||
Weighted Average Number of Shares Outstanding, Basic and Diluted | 159,228,815 | 76,436,408 | 34,376,427 | |||||||||||||
Number of dilutive potential common shares | 18,614,643 | 40,464,065 | 11,407,263 | |||||||||||||
Common stock warrants | 4,219,442 | 4,219,442 | ||||||||||||||
Weighted average exercise price of warrants (in dollars per share) | $3.84 | $3.84 | $4 | |||||||||||||
Stock options | ||||||||||||||||
Denominator | ||||||||||||||||
Number of dilutive potential common shares | 8,367,271 | 4,703,326 | 1,986,255 | |||||||||||||
Restricted stock | ||||||||||||||||
Denominator | ||||||||||||||||
Number of dilutive potential common shares | 473,336 | 650,002 | ||||||||||||||
Warrants | ||||||||||||||||
Denominator | ||||||||||||||||
Number of dilutive potential common shares | 4,219,442 | 24,137,878 | 9,421,008 | |||||||||||||
Preferred stock | ||||||||||||||||
Denominator | ||||||||||||||||
Number of dilutive potential common shares | 5,554,594 | 10,972,859 | ||||||||||||||
Warrants issued in May, 2011 | ||||||||||||||||
Denominator | ||||||||||||||||
Common stock warrants (in shares) | 22,995,365 | |||||||||||||||
Number of warrants issued (in shares) | 7,128,563 | |||||||||||||||
Number of warrants exercised (in shares) | 22,776,023 | |||||||||||||||
Warrants issued in February, 2013 | ||||||||||||||||
Denominator | ||||||||||||||||
Number of warrants issued (in shares) | 23,637,500 | |||||||||||||||
Number of warrants exercised (in shares) | 23,637,400 | |||||||||||||||
Warrants issued in January, 2014 | ||||||||||||||||
Denominator | ||||||||||||||||
Number of warrants issued (in shares) | 4,000,000 | |||||||||||||||
Number of warrants exercised (in shares) | 0 |
Acquisition_of_ReliOn_Inc_Deta
Acquisition of ReliOn Inc (Details) (USD $) | 12 Months Ended | 0 Months Ended | |
Dec. 31, 2014 | Dec. 31, 2013 | Apr. 02, 2014 | |
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired | |||
Gain on bargain purchase | ($1,014,256) | ||
Unaudited pro forma financial information | |||
Revenue | 65,361,494 | 31,190,848 | |
Net loss attributable to the Company | -88,925,977 | -69,645,886 | |
Basic and diluted loss per share (in dollars per share) | ($0.56) | ($0.90) | |
ReliOn | |||
Description of Business | |||
Purchase price | 4,000,000 | ||
Number of shares of common stock issued | 530,504 | ||
Closing price of the company's stock | $7.54 | ||
Preliminary allocation of the purchase price to the estimated fair value of the net assets acquired | |||
Cash and cash equivalents | 414,000 | ||
Accounts receivable, net | 315,975 | ||
Inventory | 5,161,223 | ||
Prepaid expenses and other assets | 88,894 | ||
Property and equipment | 162,990 | ||
Identifiable intangibles | 980,000 | ||
Accounts payable and accrued expenses | -1,682,782 | ||
Note payable | -426,044 | ||
Total Net Assets Acquired | 5,014,256 | ||
Gain on bargain purchase | -1,014,256 | ||
Acquisition consideration | $4,000,000 |
Inventory_Details
Inventory (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Inventory. | ||
Raw materials and supplies | $18,501,386 | $8,881,596 |
Work-in-process | 237,268 | 219,327 |
Finished goods | 5,996,947 | 1,305,397 |
Total inventory | $24,735,601 | $10,406,320 |
Stockholders_Equity_Details
Stockholders' Equity (Details) (USD $) | 0 Months Ended | 12 Months Ended | ||||||||||||
Apr. 30, 2014 | Mar. 11, 2014 | Jan. 15, 2014 | Sep. 16, 2013 | Feb. 22, 2013 | Feb. 20, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014 | Mar. 11, 2014 | Sep. 16, 2013 | Mar. 29, 2012 | Mar. 28, 2012 | |
Stockholders' equity | ||||||||||||||
Common Stock, par value (in dollars per share) | $0.01 | $0.01 | ||||||||||||
Common Stock, shares issued | 173,644,532 | 106,356,558 | ||||||||||||
Common Stock, Shares, Outstanding | 173,266,416 | 106,190,652 | ||||||||||||
Preferred Stock, Shares Authorized | 5,000,000 | |||||||||||||
Preferred Stock, Par or Stated Value Per Share | $0.01 | |||||||||||||
Shares of common stock issued in an underwritten public offering | 22,600,000 | 3,902,440 | 10,000,000 | 18,600,000 | 18,910,000 | |||||||||
Per share price of shares of common stock sold in an underwritten public offering | $5.50 | $5.74 | $0.54 | $5.50 | $5.74 | $0.54 | $1.15 | $1.15 | ||||||
Gross proceeds from shares of common stock sold in an underwritten public offering | $124,300,000 | $22,400,006 | $176,700,000 | |||||||||||
Net proceeds from shares of common stock sold | 116,443,375 | 21,308,987 | 9,151,221 | 400,000 | 176,700,006 | 14,807,718 | 17,192,500 | |||||||
Warrants | ||||||||||||||
Stockholders' equity | ||||||||||||||
Increase in additional paid-in capital | $83,444,574 | |||||||||||||
Series A Junior Participating Cumulative Preferred Stock | ||||||||||||||
Stockholders' equity | ||||||||||||||
Preferred Stock, Par or Stated Value Per Share | $0.01 | $0.01 | ||||||||||||
Shares, Outstanding | 0 | 0 |
Stockholders_Equity_Details_2
Stockholders' Equity (Details 2) (USD $) | 0 Months Ended | 1 Months Ended | 12 Months Ended | ||||||||||||||||
Apr. 30, 2014 | Mar. 11, 2014 | Jan. 15, 2014 | Sep. 16, 2013 | Feb. 22, 2013 | Feb. 20, 2013 | Mar. 29, 2012 | Mar. 28, 2012 | Feb. 28, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Apr. 30, 2014 | Mar. 11, 2014 | Jan. 15, 2014 | Sep. 16, 2013 | Feb. 20, 2013 | Mar. 29, 2012 | Mar. 28, 2012 | |
Stockholders' equity | |||||||||||||||||||
Shares of common stock issued | 22,600,000 | 3,902,440 | 10,000,000 | 18,600,000 | 18,910,000 | ||||||||||||||
Shares of common stock that can be purchased from warrants issued in an underwritten public offering | 4,000,000 | 18,910,000 | 13,000,000 | 4,000,000 | 18,910,000 | 13,000,000 | |||||||||||||
Number of shares of common stock in each fixed combination of shares and the warrants sold | 1 | 1 | |||||||||||||||||
Number of warrants in each fixed combination of shares and the warrants sold to purchase one share of common stock | 0.4 | 1 | |||||||||||||||||
Price of per fixed combination of the shares and the warrants sold | $3 | $0.15 | $3 | $0.15 | |||||||||||||||
Gross proceeds from sales of fixed combination of the shares and the warrants | $30,000,000 | ||||||||||||||||||
Exercise price of warrants (in dollars per share) | $4 | $3.84 | $4 | ||||||||||||||||
Net proceeds from public offering | 27,970,256 | 10,600,000 | 1,900,000 | 2,085,525 | 13,704,745 | 2,300,000 | 165,722,618 | 12,873,452 | |||||||||||
Per share price of shares of common stock sold in an underwritten public offering | $5.50 | $5.74 | $0.54 | $1.15 | $1.15 | $5.50 | $5.74 | $0.54 | $1.15 | $1.15 | |||||||||
Net proceeds from shares of common stock sold | 116,443,375 | 21,308,987 | 9,151,221 | 400,000 | 176,700,006 | 14,807,718 | 17,192,500 | ||||||||||||
Warrants with exercise price of $0.15 | |||||||||||||||||||
Stockholders' equity | |||||||||||||||||||
Exercise price of warrants (in dollars per share) | $0.15 | ||||||||||||||||||
Warrants with exercise price of $0.18 | |||||||||||||||||||
Stockholders' equity | |||||||||||||||||||
Exercise price of warrants (in dollars per share) | $0.18 | ||||||||||||||||||
Over-allotment option | |||||||||||||||||||
Stockholders' equity | |||||||||||||||||||
Shares of common stock issued | 2,790,000 | 2,801,800 | 1,950,000 | ||||||||||||||||
Per share price of shares of common stock sold in an underwritten public offering | $0.54 | $0.54 | |||||||||||||||||
Net proceeds from shares of common stock sold | $1,408,671 | ||||||||||||||||||
Over-allotment option | Warrants with exercise price of $0.15 | |||||||||||||||||||
Stockholders' equity | |||||||||||||||||||
Exercise price of warrants (in dollars per share) | $0.15 | $0.15 | |||||||||||||||||
Warrants issued | 2,836,500 | ||||||||||||||||||
Over-allotment option | Warrants with exercise price of $0.18 | |||||||||||||||||||
Stockholders' equity | |||||||||||||||||||
Exercise price of warrants (in dollars per share) | $0.18 | $0.18 | |||||||||||||||||
Warrants issued | 1,891,000 |
Redeemable_Preferred_Stock_Det
Redeemable Preferred Stock (Details) | 0 Months Ended | 12 Months Ended | 0 Months Ended | 0 Months Ended | ||||||||||||
Aug. 26, 2014 | Dec. 31, 2014 | Jan. 15, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 26, 2014 | Jun. 30, 2014 | Aug. 26, 2014 | 8-May-13 | 8-May-13 | Dec. 31, 2014 | 8-May-13 | Aug. 26, 2014 | |
USD ($) | USD ($) | USD ($) | Common Stock | Warrants with exercise price of $0.15 | Warrants with exercise price of $0.18 | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Air Liquide | Air Liquide | Air Liquide | Air Liquide | Air Liquide | Air Liquide | ||
USD ($) | USD ($) | USD ($) | USD ($) | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | Series C redeemable convertible preferred stock | |||||||
USD ($) | EUR (€) | USD ($) | Common Stock | |||||||||||||
item | ||||||||||||||||
Redeemable preferred stock | ||||||||||||||||
Redeemable stock issued (in shares) | 5,231 | 10,431 | 5,231 | 10,431 | ||||||||||||
Redeemable stock issued, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | |||||||||||||
Aggregate purchase price of shares issued | $2,595,400 | € 2,000,000 | ||||||||||||||
Temporary Equity, Shares Outstanding | 5,231 | 10,431 | 5,231 | |||||||||||||
Net proceeds, after fees and expenses | $2,371,080 | |||||||||||||||
Number of directors entitled to designate on board under Securities Purchase Agreement | 1 | 1 | ||||||||||||||
Minimum percentage holding of common stock on conversion of preferred stock | 5.00% | 5.00% | ||||||||||||||
Minimum percentage holding of on an as-converted basis of preferred stock | 50.00% | 50.00% | ||||||||||||||
Dividend rate | 8.00% | |||||||||||||||
Conversion price per share | $0.23 | $0.25 | ||||||||||||||
Number of warrants | 18,846,400 | 1,891,000 | ||||||||||||||
Weighted average exercise price of warrants (in dollars per share) | $3.84 | $4 | $0.15 | $0.18 | ||||||||||||
Shares issued upon conversion of redeemable stock (in shares) | 5,521,676 | -5,200 | 5,521,676 | |||||||||||||
Stock Repurchased and Retired During Period, Shares | 5,200 | |||||||||||||||
Adjusted conversion price per share | $0.23 |
Employee_Benefit_Plans_Details
Employee Benefit Plans (Details) (USD $) | 12 Months Ended | ||||||||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Jul. 23, 2014 | Jul. 22, 2014 | 16-May-12 | 15-May-12 | 12-May-11 | |
Employee Benefit Plans | |||||||||
Compensation cost | $4,200,000 | $2,200,000 | $2,000,000 | ||||||
Stock options | |||||||||
Employee Benefit Plans | |||||||||
Number of options outstanding (in shares) | 8,367,271 | 4,703,326 | |||||||
Compensation cost | $3,374,000 | ||||||||
Number of options granted in period (in shares) | 4,246,000 | 3,090,900 | 78,400 | ||||||
Assumptions for estimating fair value | |||||||||
Dividend Yield | 0.00% | 0.00% | 0.00% | ||||||
Expected term of options (years) | 6 years | 6 years | 6 years | ||||||
Risk Free interest rate, minimum | 1.77% | 0.93% | 0.80% | ||||||
Risk Free interest rate, maximum | 1.94% | 1.70% | 1.16% | ||||||
Volatility, minimum (as a percent): | 107.00% | 92.00% | |||||||
Volatility (as a percent): | 80.00% | ||||||||
Volatility, maximum (as a percent): | 114.00% | 107.00% | |||||||
the 2011 Plan | Stock options | |||||||||
Employee Benefit Plans | |||||||||
Maximum number of common stock shares available for issuance | 17,000,000 | 6,500,000 | 6,500,000 | 1,000,000 | 1,000,000 | ||||
Aggregate number of options granted (in shares) | 8,400,000 | ||||||||
Number of options outstanding (in shares) | 8,400,000 | ||||||||
Number of options available for issuance (in shares) | 8,200,000 | ||||||||
Expiration period | 10 years | ||||||||
the 2011 Plan | Stock options | Minimum | |||||||||
Employee Benefit Plans | |||||||||
Vesting period | 1 year | ||||||||
the 2011 Plan | Stock options | Maximum | |||||||||
Employee Benefit Plans | |||||||||
Vesting period | 3 years | ||||||||
the 2011 Plan | Employees | Stock options | |||||||||
Employee Benefit Plans | |||||||||
Vesting period | 3 years | ||||||||
Expiration period | 10 years | ||||||||
the 2011 Plan | Board of Directors | Stock options | |||||||||
Employee Benefit Plans | |||||||||
Vesting period | 1 year |
Employee_Benefit_Plans_Details1
Employee Benefit Plans (Details 2) (Stock options, USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Shares | |||
Options outstanding, beginning balance (in shares) | 4,703,326 | ||
Granted (in shares) | 4,246,000 | 3,090,900 | 78,400 |
Exercised (in shares) | -417,852 | ||
Forfeited (in shares) | -143,053 | ||
Expired (in shares) | -21,150 | ||
Options outstanding, end balance (in shares) | 8,367,271 | 4,703,326 | |
Options exercisable (in shares) | 2,266,607 | ||
Options unvested (in shares) | 6,100,664 | ||
Weighted Average Exercise Price | |||
Options outstanding, beginning balance, weighted-average exercise price | $3.22 | ||
Granted, weighted-average exercise price | $4.86 | ||
Exercised, weighted-average exercise price | $0.97 | ||
Forfeited, weighted-average exercise price | $5.25 | ||
Expired, weighted-average exercise price | $77.22 | ||
Options outstanding, end balance, weighted-average exercise price | $3.94 | $3.22 | |
Options exercisable, weighted-average exercise price | $5.16 | ||
Options unvested, weighted-average exercise price | $3.49 | ||
Stock option activity additional disclosures | |||
Options outstanding, weighted-average remaining contractual term | 8 years 8 months 12 days | 8 years 8 months 12 days | |
Options exercisable, weighted-average remaining contractual term | 7 years | ||
Options unvested, weighted-average remaining contractual term | 9 years 3 months 18 days | ||
Options outstanding, aggregate intrinsic value | $7,865,235 | ||
Options exercisable, aggregate intrinsic value | 4,895,871 | ||
Options unvested, aggregate intrinsic value | 2,989,325 | ||
Weighted-average grant date fair value of options granted (per share) | $4.05 | $0.32 | $0.83 |
Unrecognized compensation cost | 15,252,000 | ||
Period for recognition | 3 years | ||
Fair value of stock options that vested during the period | $3,374,000 | $1,445,000 | |
the 2011 Plan | |||
Shares | |||
Options outstanding, end balance (in shares) | 8,400,000 |
Employee_Benefit_Plans_Details2
Employee Benefit Plans (Details 3) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Employee Benefit Plans | |||
Compensation cost | $4,200,000 | $2,200,000 | $2,000,000 |
Restricted stock | |||
Employee Benefit Plans | |||
Compensation cost | 84,000 | ||
Unrecognized compensation cost | 265,000 | ||
Period for recognition | 3 years | ||
Shares | |||
Unvested restricted stock, beginning balance (in shares) | 650,002 | ||
Granted (in shares) | 40,000 | ||
Vested (in shares) | -216,666 | ||
Unvested restricted stock, end balance (in shares) | 473,336 | ||
Aggregate Intrinsic Value | |||
Unvested restricted stock aggregate intrinsic value | $1,420,008 | ||
Restricted stock | Minimum | |||
Employee Benefit Plans | |||
Vesting period | 1 year | ||
Restricted stock | Maximum | |||
Employee Benefit Plans | |||
Vesting period | 3 years |
Employee_Benefit_Plans_Details3
Employee Benefit Plans (Details 4) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Non-Employee Director Compensation | |||
Compensation cost | $4,200,000 | $2,200,000 | $2,000,000 |
Non Employee Director Member | |||
Non-Employee Director Compensation | |||
Granted (in shares) | 71,311 | ||
Compensation cost | 331,000 | ||
401(k) Savings & Retirement Plan | |||
401(K) Savings & Retirement Plan | |||
Percent of salary employee is permitted to contribute | 100.00% | ||
Vesting period | 3 years | ||
Common stock, shares issued | 74,863 | 1,319,914 | 403,579 |
Total expense (including issuance of shares) | $367,000 | $371,000 | $436,000 |
Employee_Benefit_Plans_Details4
Employee Benefit Plans (Details 5) | 12 Months Ended | 1 Months Ended | ||||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | 31-May-11 | Feb. 28, 2013 | Jan. 31, 2014 | |
Earnings Per Share | ||||||
Antidilutive shares excluded from calculation of diluted earnings per share | 18,614,643 | 40,464,065 | 11,407,263 | |||
Warrants outstanding (in shares) | 4,219,442 | |||||
Warrants issued in May, 2011 | ||||||
Earnings Per Share | ||||||
Number of warrants issued (in shares) | 7,128,563 | |||||
Number of warrants exercised (in shares) | 22,776,023 | |||||
Warrants issued in February, 2013 | ||||||
Earnings Per Share | ||||||
Number of warrants issued (in shares) | 23,637,500 | |||||
Number of warrants exercised (in shares) | 23,637,400 | |||||
Warrants issued in January, 2014 | ||||||
Earnings Per Share | ||||||
Number of warrants issued (in shares) | 4,000,000 | |||||
Number of warrants exercised (in shares) | 0 | |||||
Restricted stock | ||||||
Earnings Per Share | ||||||
Antidilutive shares excluded from calculation of diluted earnings per share | 473,336 | 650,002 | ||||
Warrants | ||||||
Earnings Per Share | ||||||
Antidilutive shares excluded from calculation of diluted earnings per share | 4,219,442 | 24,137,878 | 9,421,008 | |||
Preferred stock | ||||||
Earnings Per Share | ||||||
Antidilutive shares excluded from calculation of diluted earnings per share | 5,554,594 | 10,972,859 | ||||
Stock options | ||||||
Earnings Per Share | ||||||
Antidilutive shares excluded from calculation of diluted earnings per share | 8,367,271 | 4,703,326 | 1,986,255 |
Note_Receivable_Details
Note Receivable (Details) (USD $) | 0 Months Ended | 12 Months Ended | |
25-May-12 | Dec. 31, 2014 | Dec. 31, 2013 | |
Promissory Note | |||
Company executed a Promissory Note with Forem Energy | $663,359 | ||
This note is unsecured and bears interest at an annual rate | 2.9 | ||
Receivables relating to this agreement in the amount recorded as note receivable | 447,408 | 509,945 | |
Prepaid expenses and other current assets recorded as current portion of note receivable | $67,667 | $65,735 |
Property_Plant_and_Equipment_D
Property, Plant and Equipment (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Property, plant and equipment | |||
Property, plant, and equipment, gross | $31,850,662 | $31,004,295 | |
Less accumulated depreciation | -26,538,755 | -25,726,628 | |
Property, plant, and equipment, net | 5,311,907 | 5,277,667 | |
Property, plant and equipment consist of the following | |||
Depreciation expense | -1,400,000 | -1,400,000 | -1,900,000 |
Land. | |||
Property, plant and equipment | |||
Property, plant, and equipment, gross | 90,000 | 90,000 | |
Buildings. | |||
Property, plant and equipment | |||
Property, plant, and equipment, gross | 15,332,232 | 15,332,232 | |
Building improvements | |||
Property, plant and equipment | |||
Property, plant, and equipment, gross | 5,031,803 | 4,923,827 | |
Software, machinery and equipment | |||
Property, plant and equipment | |||
Property, plant, and equipment, gross | $11,396,627 | $10,658,236 |
Capital_Lease_Details_2
Capital Lease (Details 2) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Capital Lease | ||
Leased property under capital lease | $3,098,921 | $3,098,921 |
Less accumulated depreciation | -1,162,095 | -645,609 |
Leased property under capital lease, net | $1,936,826 | $2,453,312 |
Finance_Obligation_Details
Finance Obligation (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Mar. 27, 2013 | |
Finance Obligation. | |||
Aggregate sale price in sale-leaseback transaction | $4,500,000 | ||
Cash received in sale-leaseback transaction | 2,750,000 | ||
Amount receivable under sale-leaseback transaction | 1,750,000 | ||
Annual interest rate (as a percent) | 5.00% | ||
Term of equal monthly installments | 15 years | ||
Amount of equal monthly installments | 13,839 | ||
Current portion of finance obligation in sale-leaseback transaction | 64,511 | 59,375 | |
Lease term | 15 years | ||
Future minimum financing obligation payments 2015 | 459,566 | ||
Future minimum financing obligation payments 2016 | 459,566 | ||
Future minimum financing obligation payments 2017 | 459,566 | ||
Future minimum financing obligation payments 2018 | 486,467 | ||
Future minimum financing obligation payments 2019 | 494,918 | ||
Future minimum financing obligation payments Thereafter | 4,254,405 | ||
Total future minimum financing obligation payments | 6,614,488 | ||
Lease interest | 2,508,417 | ||
Present value of future minimum financing obligation payments | 4,106,071 | ||
Standby letter of credit amount | 500,000 | ||
Percentage of collateralization of standby letter of credit | 100.00% | ||
Period of renewal of standby letter of credit | 10 years | ||
Restricted cash | $500,000 | $500,000 |
Intangible_Assets_Details
Intangible Assets (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets | |||
Gross Carrying Amount | $19,016,835 | $18,036,835 | |
Accumulated amortization | -17,526,516 | -15,135,240 | |
Total | 1,490,319 | 2,901,595 | |
Amortization expense for Acquired Identifiable Intangible Assets Abstract | |||
Amortization expense for acquired identifiable intangible assets for 2014 in millions | 2,400,000 | ||
Amortization expense for acquired identifiable intangible assets for 2013 in millions | 2,300,000 | ||
Amortization expense for acquired identifiable assets for 2012 in Millions | 2,300,000 | ||
Estimated Amortization Expense Abstract | |||
2015 | 807,819 | ||
2016 | 170,000 | ||
2017 | 170,000 | ||
2018 | 170,000 | ||
2019 | 62,000 | ||
Thereafter | 110,500 | ||
Total | 1,490,319 | ||
Acquired technology | |||
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets | |||
Weighted Average Amortization Period | 8 years | 8 years | |
Gross Carrying Amount | 17,696,835 | 17,036,835 | |
Accumulated amortization | -16,539,683 | -14,301,907 | |
Total | 1,157,152 | 2,734,928 | |
Customer relationships | |||
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets | |||
Weighted Average Amortization Period | 8 years | 8 years | |
Gross Carrying Amount | 1,260,000 | 1,000,000 | |
Accumulated amortization | -977,833 | -833,333 | |
Total | 282,167 | 166,667 | |
Trademark | |||
Gross carrying amount and accumulated amortization of acquired identifiable intangible assets | |||
Weighted Average Amortization Period | 5 years | ||
Gross Carrying Amount | 60,000 | ||
Accumulated amortization | -9,000 | ||
Total | $51,000 |
Accrued_expenses_Details
Accrued expenses (Details) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Accrued Expenses | ||
Accrued payroll and compensation related costs | $2,517,327 | $1,531,175 |
Accrued dealer commissions and customer rebates | 621,340 | 235,690 |
Accrued accounts payable | 5,610,689 | 1,301,909 |
Total | $8,749,356 | $3,068,774 |
Fair_Value_Details
Fair Value (Details) (Recurring basis, Warrants, USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Significant Other Unobservable Inputs (Level 3) | ||
Fair Value | ||
Financial liabilities | $9,418,413 | $28,829,849 |
Total. | ||
Fair Value | ||
Financial liabilities | $9,418,413 | $28,829,849 |
Fair_Value_Details_2
Fair Value (Details 2) (Recurring basis, Significant Other Unobservable Inputs (Level 3), Warrants, USD $) | 12 Months Ended | |
Dec. 31, 2014 | Dec. 31, 2013 | |
Recurring basis | Significant Other Unobservable Inputs (Level 3) | Warrants | ||
Reconciliations of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (i.e. Level 3) | ||
Balance at the beginning of the period | $28,829,849 | $475,825 |
Change in fair value of common stock warrants | 52,259,898 | 37,101,818 |
Issuance of common stock warrants | 11,773,240 | 2,451,028 |
Exercise of common stock warrants | -83,444,574 | -11,198,822 |
Balance at the end of the period | $9,418,413 | $28,829,849 |
Fair_Value_Details_3
Fair Value (Details 3) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | ||
Dec. 31, 2014 | Jan. 20, 2014 | Feb. 20, 2013 | Feb. 20, 2013 | Dec. 31, 2013 | 31-May-11 | |
Valuation technique for assets measured and recorded at fair value | ||||||
Expected dividend yield (as a percent) | 0.00% | |||||
Common stock warrants issued on January 20, 2014 | ||||||
Valuation technique for assets measured and recorded at fair value | ||||||
Risk-free interest rate (as a percent) | 1.35% | 1.65% | ||||
Volatility (as a percent) | 119.20% | 107.60% | ||||
Expected average term | 4 years | 5 years | ||||
Common stock warrants issued on February 20, 2013 | ||||||
Valuation technique for assets measured and recorded at fair value | ||||||
Risk-free interest rate (as a percent) | 1.06% | 0.85% | 1.14% | |||
Volatility (as a percent) | 126.20% | 102.00% | 99.00% | |||
Expected average term | 3 years 1 month 6 days | 5 years | 4 years 1 month 6 days | |||
Common stock warrants issued on May 31, 2011 | ||||||
Valuation technique for assets measured and recorded at fair value | ||||||
Risk-free interest rate (as a percent) | 0.21% | 0.52% | 0.75% | |||
Volatility (as a percent) | 136.60% | 119.30% | 94.40% | |||
Expected average term | 1 year 4 months 24 days | 2 years 4 months 24 days | 2 years 4 months 24 days |
Income_Taxes_Details
Income Taxes (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Loss before income taxes | |||
United States | ($87,458,000) | ($61,730,000) | ($30,399,000) |
Foreign | -1,354,000 | -1,350,000 | -1,463,000 |
Loss before income taxes | -88,812,503 | -63,079,941 | -31,862,454 |
Income tax benefit | |||
Foreign | -325,000 | -410,000 | |
Current Income Tax Expense (Benefit), Total | -325,000 | -410,000 | |
Significant component of U.S. deferred income tax expense (benefit) | |||
Valuation allowance increase (decrease) | 12,437,000 | ||
Provision for income taxes | -324,680 | -410,259 | |
U.S. | |||
Significant component of U.S. deferred income tax expense (benefit) | |||
Deferred tax (benefit) expense | -4,282,000 | -3,209,000 | 10,661,000 |
Net operating loss carryforward (generated) expired | -8,974,000 | -6,536,000 | 26,924,000 |
Valuation allowance increase (decrease) | 13,256,000 | 9,745,000 | -37,585,000 |
Foreign | |||
Significant component of U.S. deferred income tax expense (benefit) | |||
Deferred tax (benefit) expense | 194,000 | 1,406,000 | -1,041,000 |
Net operating loss carryforward (generated) expired | 625,000 | -15,000 | -79,000 |
Valuation allowance increase (decrease) | ($819,000) | ($1,391,000) | $1,120,000 |
Income_Taxes_Details_2
Income Taxes (Details 2) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Effective income tax rate reconciliation | |||
U.S. Federal statutory tax rate | -35.00% | -35.00% | -35.00% |
Deferred state taxes, net of federal benefit | -1.20% | -1.30% | -3.30% |
Common stock warrant liability | 0.206 | 0.206 | -0.053 |
Gain on Hypulsion transaction | -0.018 | ||
Bargain purchase gain - ReliOn | -0.004 | ||
Other, net | 0.10% | 0.10% | 0.10% |
Change to uncertain tax positions | -0.009 | -0.013 | -0.016 |
Foreign tax rate differential | 0.20% | 0.20% | 0.50% |
Expiring attribute carryforward | 0.008 | 0.022 | |
Adjustments to open deferred tax balance | -0.30% | -5.80% | |
Writeoff of tax attributes due to imposition of Section 382 limitation | 0.015 | 1.657 | |
Tax credits | 0.00% | 0.00% | |
Change in valuation allowance | 15.40% | 14.50% | -115.30% |
Total effective income tax rate | -0.40% | -0.60% |
Income_Taxes_Details_3
Income Taxes (Details 3) (USD $) | Dec. 31, 2014 | Dec. 31, 2013 |
Significant components of the Company's deferred tax assets and liabilities | ||
Valuation allowance | ($49,500,000) | ($37,100,000) |
Section 382 recognized built in loss | 8,000,000 | |
Deferred tax assets included in other noncurrent assets | 1,400,000 | |
Deferred tax liabilities included in other current liabilities | 1,400,000 | |
U.S. | ||
Significant components of the Company's deferred tax assets and liabilities | ||
Intangible assets | 59,000 | |
Deferred revenue | 4,492,000 | 3,425,000 |
Other reserves and accruals | 1,492,000 | 1,253,000 |
Property, plant and equipment | 1,624,000 | 1,450,000 |
Amortization of stock-based compensation | 10,623,000 | 9,183,000 |
Capitalized research & development expenditures | 12,816,000 | 13,775,000 |
Net operating loss carryforwards | 18,857,000 | 9,883,000 |
Total deferred tax asset | 49,904,000 | 39,028,000 |
Valuation allowance | -40,002,000 | -26,746,000 |
Net deferred tax assets | 9,902,000 | 12,282,000 |
Intangible assets | -335,000 | |
Non-employee stock based compensation | -1,556,000 | -1,556,000 |
Section 382 recognized built in loss | -8,011,000 | -10,726,000 |
Net deferred tax liability | -9,902,000 | -12,282,000 |
Foreign | ||
Significant components of the Company's deferred tax assets and liabilities | ||
Intangible assets | 1,269,000 | 999,000 |
Tax credit carryforwards | 78,000 | 84,000 |
Property, plant and equipment | 464,000 | 504,000 |
Capitalized research & development expenditures | 4,777,000 | 5,195,000 |
Net operating loss carryforwards | 2,931,000 | 3,556,000 |
Total deferred tax asset | 9,519,000 | 10,338,000 |
Valuation allowance | ($9,519,000) | ($10,338,000) |
Income_Taxes_Details_4
Income Taxes (Details 4) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
A reconciliation of the current year change in valuation allowance | |||
Increase in valuation allowance for current year increase in net operating losses | $8,140,000 | ||
Increase in valuation allowance for current year net increase in deferred tax assets other than net operating losses | 4,647,000 | ||
Decrease in valuation allowance as a result of foreign currency fluctuation | -829,000 | ||
Increase in valuation allowance due to current year change of deferred tax assets as the result of uncertain tax positions | 479,000 | ||
Net increase (decrease) in valuation allowances | 12,437,000 | ||
U.S. | |||
A reconciliation of the current year change in valuation allowance | |||
Increase in valuation allowance for current year increase in net operating losses | 8,974,000 | ||
Increase in valuation allowance for current year net increase in deferred tax assets other than net operating losses | 4,282,000 | ||
Net increase (decrease) in valuation allowances | 13,256,000 | 9,745,000 | -37,585,000 |
Foreign | |||
A reconciliation of the current year change in valuation allowance | |||
Increase in valuation allowance for current year increase in net operating losses | -834,000 | ||
Increase in valuation allowance for current year net increase in deferred tax assets other than net operating losses | 365,000 | ||
Decrease in valuation allowance as a result of foreign currency fluctuation | -829,000 | ||
Increase in valuation allowance due to current year change of deferred tax assets as the result of uncertain tax positions | 479,000 | ||
Net increase (decrease) in valuation allowances | ($819,000) | ($1,391,000) | $1,120,000 |
Income_Taxes_Details_5
Income Taxes (Details 5) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Income taxes | |||
Deferred tax assets resulting from the exercise of employee stock options, which will be allocated to paid-in capial | $100,000 | $100,000 | |
Unrecognized loss recognition period | 5 years | ||
Unrecognized loss from change in ownership that should be recognized during the recognition period | 40,700,000 | ||
Section 382 recognized built in loss | 8,000,000 | ||
Amount of research credit carryforwards subject to IRC Section 382 limitations | 15,600,000 | ||
Research and experimental development expenditure carryforwards | 19,100,000 | ||
Canadian ITC credit carryforwards | 500,000 | ||
Un-repatriated foreign earnings | 0 | ||
Reconciliation of the beginning and ending amount of unrecognized tax benefits | |||
Unrecognized tax benefits balance at beginning of year | 1,033,000 | 1,579,000 | 2,046,000 |
Reductions for tax positions of prior years | -465,000 | -471,000 | -503,000 |
Reductions for currency translations | -46,000 | -75,000 | |
Increases for currency translations | 36,000 | ||
Unrecognized tax benefits balance at end of year | 522,000 | 1,033,000 | 1,579,000 |
Interest and penalties benefit recognized due to expiration of statute of limitations | 400,000 | ||
Accrued interest and penalties | 400,000 | ||
Unrecognized tax benefits | |||
Income taxes | |||
Canadian ITC credit carryforwards | 400,000 | ||
U.S. | |||
Income taxes | |||
Section 382 recognized built in loss | -8,011,000 | -10,726,000 | |
Net operating loss carryforwards | 18,857,000 | 9,883,000 | |
Foreign | |||
Income taxes | |||
Unused net operating loss carryforwards | 12,200,000 | ||
Net operating loss carryforwards | 2,931,000 | 3,556,000 | |
Foreign | Unrecognized tax benefits | |||
Income taxes | |||
Net operating loss carryforwards | 500,000 | ||
Federal and state | |||
Income taxes | |||
Unused net operating loss carryforwards | 764,000,000 | ||
Net operating loss carryforwards assumed during acquisition | 117,000,000 | ||
Net operating loss carryforwards generated by the Company subsequent to acquisition | 647,000,000 | ||
Net operating loss carryforwards subject to IRC Section 382 limitations | 728,000,000 | ||
Amount of net operating loss carryforwards that will expire due to IRC Section 382 limitations | $715,000,000 |
Warranty_Reserve_Details
Warranty Reserve (Details) (USD $) | 0 Months Ended | 12 Months Ended | ||
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | |
Warranty Reserve. | ||||
Beginning balance - January 1 | $1,608,131 | $2,671,409 | ||
Addition for Relion acquisition | 233,528 | |||
Additions for current year deliveries | 960,894 | 970,775 | ||
Reductions for payments made | 1,491,111 | 2,034,053 | ||
Ending balance - December 31 | $1,311,442 | $1,608,131 |
Commitment_and_Contingencies_D
Commitment and Contingencies (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011 | |
Commitments and Contingencies. | |||
Letter of credit with Silicon Valley Bank | $525,000 | ||
Rental Expense And Rental Income For All Operating Leases Abstract | |||
Minimum rentals | 1,538,513 | 769,000 | |
Sublease rental income | -63,242 | -76,104 | |
Total Rental expense | 1,475,271 | 692,896 | |
Summary Of Future Minimum LeasePayments Under Non Cancelable Operating Leases Abstract | |||
2015 | 2,984,131 | ||
2016 | 3,005,307 | ||
2017 | 3,061,674 | ||
2018 | 3,122,828 | ||
2019 | 2,877,155 | ||
2020 and thereafter | 2,526,699 | ||
Total future minimum lease payments | $17,577,794 | ||
Accounts receivable | Credit risk | Customers | |||
Customer Concentration | |||
Number of customers | 4 | 5 | |
Concentration risk (as a percent) | 69.90% | 78.30% | |
Accounts receivable | Credit risk | Customer one | |||
Customer Concentration | |||
Concentration risk (as a percent) | 30.20% | 30.80% | |
Accounts receivable | Credit risk | Customer two | |||
Customer Concentration | |||
Concentration risk (as a percent) | 16.00% | 26.90% | |
Accounts receivable | Credit risk | Customer three | |||
Customer Concentration | |||
Concentration risk (as a percent) | 13.40% | 10.20% | |
Accounts receivable | Credit risk | Customer four | |||
Customer Concentration | |||
Concentration risk (as a percent) | 10.30% | 5.80% | |
Accounts receivable | Credit risk | Customer five | |||
Customer Concentration | |||
Concentration risk (as a percent) | 4.60% | ||
Revenues. | Customer concentration | Customers | |||
Customer Concentration | |||
Number of customers | 2 | 3 | |
Concentration risk (as a percent) | 37.20% | 33.20% | |
Revenues. | Customer concentration | Customer one | |||
Customer Concentration | |||
Concentration risk (as a percent) | 24.10% | 11.60% | |
Revenues. | Customer concentration | Customer two | |||
Customer Concentration | |||
Concentration risk (as a percent) | 13.10% | 11.20% | |
Revenues. | Customer concentration | Customer three | |||
Customer Concentration | |||
Concentration risk (as a percent) | 10.40% |
Commitment_and_Contingencies_D1
Commitment and Contingencies (Details 2) (USD $) | 12 Months Ended |
In Millions, unless otherwise specified | Dec. 31, 2014 |
Soroof Trading Company Ltd. | |
Commitments and Contingencies | |
Liability related to litigation | 2.4 |
Minimum | |
Commitments and Contingencies | |
Lease Term | 5 years |
Hydrogen supply agreement terms | 6 years |
Maximum | |
Commitments and Contingencies | |
Lease Term | 6 years |
Hydrogen supply agreement terms | 10 years |
Supplemental_Disclosures_of_Ca1
Supplemental Disclosures of Cash Flows Information (Details) (USD $) | 12 Months Ended | ||
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Supplemental Disclosures of Cash Flows Information | |||
Stock-based compensation accrual impact, net | ($103,875) | ($31,378) | ($10,687) |
Cash paid for interest | $432,826 | $474,716 | $255,896 |
Supplemental_Disclosures_of_Ca2
Supplemental Disclosures of Cash Flows Information (Details 2) (ReliOn, USD $) | 0 Months Ended |
Apr. 02, 2014 | |
ReliOn | |
Supplemental disclosures of cash flows information | |
Stock issued for net assets | ($4,000,000) |
Geographic_Information_Details
Geographic Information (Details) (USD $) | 12 Months Ended | |
Dec. 31, 2014 | Dec. 31, 2013 | |
Geographic Information | ||
United States | $12,785,115 | $11,620,594 |
Canada | 350,319 | 1,751,595 |
Total | $13,135,434 | $13,372,189 |
Unaudited_Quarterly_Financial_2
Unaudited Quarterly Financial Data (Details) (USD $) | 3 Months Ended | 12 Months Ended | |||||||||
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | |
Unaudited Quarterly Financial Data | |||||||||||
Product revenue | $12,169,000 | $12,595,000 | $12,579,000 | $3,162,000 | $5,658,000 | $2,535,000 | $5,581,000 | $4,672,000 | $40,504,929 | $18,446,082 | $20,791,874 |
Service Revenue | 8,410,000 | 6,915,000 | 4,415,000 | 2,066,000 | 2,107,000 | 1,630,000 | 1,549,000 | 1,373,000 | 1,918,731 | 1,496,530 | 1,701,330 |
Service revenue | 874,000 | 371,000 | 328,000 | 346,000 | 267,000 | 462,000 | 368,000 | 400,000 | 21,806,224 | 6,658,816 | 3,615,253 |
Net loss attributable to common shareholders | ($7,183,000) | ($9,377,000) | $3,825,000 | ($75,909,000) | ($28,929,000) | ($15,948,000) | ($9,338,000) | ($8,576,000) | ($88,643,700) | ($62,790,800) | ($31,862,454) |
Basic and diluted (in dollars per share) | ($0.04) | ($0.06) | $0.02 | ($0.57) | ($0.28) | ($0.19) | ($0.14) | ($0.18) | ($0.56) | ($0.82) | ($0.93) |