American DG Energy (ADGE) 10-Q 12 May 17 2017 Q1 Quarterly report Financial data

DOCUMENT AND ENTITY INFORMATION

DOCUMENT AND ENTITY INFORMATION - shares	3 Months Ended
	Mar. 31, 2017	May 12, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	AMERICAN DG ENERGY INC
Entity Central Index Key	1,378,706
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	adge
Entity Common Stock, Shares Outstanding		50,684,095
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2,017

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,127,252	$ 338,627
Accounts receivable, net	778,044	815,748
Unbilled revenue	17,079	18,797
Due from related party	71,468	87,845
Inventory	109,823	128,680
Assets held for sale	0	946,883
Prepaid and other current assets	356,496	299,667
Total current assets	2,460,162	2,636,247
Property and equipment, net	15,548,797	15,831,160
Investment securities	519,568	637,651
TOTAL ASSETS	18,528,527	19,105,058
Current liabilities:
Accounts payable	257,100	270,078
Accrued expenses and other current liabilities	635,238	522,525
Due to related party	183,030	127,904
Total current liabilities	1,075,368	920,507
Long-term liabilities:
Loan due to related party	850,000	850,000
Total liabilities	1,925,368	1,770,507
Commitments and contingencies
Stockholders' equity:
Common stock, $0.001 par value; 100,000,000 shares authorized; 50,684,095 issued and outstanding at March 31, 2017 and December 31, 2016, respectively	50,684	50,684
Additional paid-in capital	58,852,221	58,823,704
Accumulated other comprehensive loss-investment securities	(254,931)	(136,848)
Accumulated deficit	(42,025,342)	(41,381,221)
Total American DG Energy Inc. stockholders’ equity	16,622,632	17,356,319
Noncontrolling interest	(19,473)	(21,768)
Total stockholders' equity	16,603,159	17,334,551
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 18,528,527	$ 19,105,058

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) [Parenthetical] - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	100,000,000	100,000,000
Common stock,shares issued	50,684,095	50,684,095
Common stock, shares outstanding	50,684,095	50,684,095

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Revenues
Energy revenues	$ 1,627,498	$ 1,364,285
Turnkey & other revenues	90,666	150,164
Sales Revenue, Net, Total	1,718,164	1,514,449
Cost of sales
Fuel, maintenance and installation	1,131,104	1,051,261
Depreciation expense	524,835	438,081
Cost of Goods and Services Sold, Total	1,655,939	1,489,342
Gross profit	62,225	25,107
Operating expenses
General and administrative	442,795	377,638
Selling	1,704	20,524
Engineering	154,578	161,002
Operating Expenses, Total	599,077	559,164
Loss from operations	(536,852)	(534,057)
Other income (expense), net
Interest and other income	4,716	12,715
Interest expense	(13,215)	(324,332)
Other income (expense), total	(8,499)	(311,617)
Loss from continuing operations before provision for income taxes	(545,351)	(845,674)
Provision for income taxes	(87,365)	(66,427)
Loss from continuing operations	(632,716)	(912,101)
Income attributable to the noncontrolling interest	11,405	1,036
Loss attributable to American DG Energy Inc. from continuing operations	(644,121)	(913,137)
Loss from discontinued operations (Note 4)	0	(188,058)
Loss attributable to American DG Energy Inc. from continuing operations	(644,121)	(1,101,195)
Other comprehensive loss - unrealized loss on securities	(118,083)	0
Comprehensive loss	$ (762,204)	$ (1,101,195)
Loss per share from continuing operations attributable to American DG Energy Inc. - basic and diluted (in dollars per share)	$ (0.01)	$ (0.02)
Loss per share from discontinued operations attributable to American DG Energy Inc. - basic and diluted (in dollars per share)	0	0
Net loss per share - basic and diluted (in dollars per share)	$ (0.01)	$ (0.02)
Weighted average shares outstanding - basic and diluted (in shares)	50,684,095	50,684,095

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss attributable to American DG Energy, Inc.	$ (644,121)	$ (1,101,195)
Income attributable to noncontrolling interest	11,405	1,036
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation	531,867	449,075
Loss from discontinued operations	0	188,058
Amortization of deferred financing costs	0	10,141
Non-cash interest expense	0	282,072
Stock-based compensation	28,517	42,303
Changes in operating assets and liabilities:
Accounts receivable and unbilled revenue	39,422	(249,147)
Due from related party	16,377	(1,104)
Inventory	18,857	110,633
Assets held for sale	946,883	0
Prepaid and other current assets	(56,829)	(71,153)
Increase (decrease) in:
Accounts payable	(12,978)	(4,306)
Accrued expenses and other current liabilities	112,713	92,226
Due to related party	55,126	(641,982)
Net cash provided by (used in) operating activities	1,047,239	(893,343)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment	(249,504)	(529,251)
Net cash used in investing activities	(249,504)	(529,251)
CASH FLOWS FROM FINANCING ACTIVITIES:
Distributions to noncontrolling interest	(9,110)	(13,258)
Net cash used in financing activities	(9,110)	(13,258)
Net increase (decrease) in cash and cash equivalents	788,625	(1,435,852)
Cash and cash equivalents, beginning of the period	338,627	4,999,709
Cash and cash equivalents, end of the period	1,127,252	3,563,857
Supplemental disclosures of cash flows information:
Income taxes	1,800	48,824
Non-cash investing and financing activities:
Distribution of nonmonetary assets	$ 0	$ 340,069

Description of Business and Bas

Description of Business and Basis of Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business and Basis of Presentation	Description of Business and Basis of Presentation Description of Business American DG Energy Inc., or the Company, we, our or us, distributes, owns, operates and maintains clean, on-site energy systems that produce electricity, hot water, heat and cooling. The Company's business model is to own the equipment that it installs at customers' facilities and to sell the energy produced by these systems to its customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. The Company calls this business the American DG Energy “On-Site Utility”. The Company was incorporated as a Delaware corporation on July 24, 2001 to install, own, operate and maintain complete DG systems, or energy systems, and other complementary systems at customer sites and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates. The Company derives revenues from selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term energy sales agreements (with a typical term of 10 to 15 years). The energy systems are generally owned by the Company and are installed in its customers’ buildings. Each month the Company obtains readings from energy meters to determine the amount of energy produced for each customer. The Company multiplies these readings by the appropriate published price of energy (electricity, natural gas or oil) from its customers’ local energy utility, to derive the value of its monthly energy sale, less the applicable negotiated discount. The Company’s revenues per customer on a monthly basis vary based on the amount of energy produced by its energy systems and the published price of energy (electricity, natural gas or oil) from its customers’ local energy utility that month. The Company’s revenues commence as new energy systems become operational. As of March 31, 2017 , the Company had 92 energy systems operational. In some cases the customer may choose to own the system rather than have it owned by American DG Energy. The Company has experienced total net losses since inception of approximately $42 million . For the next twelve months, the Company expects to experience continuing net losses as its management executes the current business plan. The Company believes that its existing resources, including cash and cash equivalents and future cash flow from operations, plus cash provided by the sale of certain inventory are sufficient to meet the working capital requirements of its existing business for the next twelve months; however, as the Company continues to grow its business by adding more energy systems, the cash requirements will increase, and the Company may need to raise additional capital through debt financings or equity offerings to meet its operating and capital needs. There can be no assurance, however, that the Company will be successful in its fundraising efforts or that additional funds will be available on acceptable terms, if at all. In 2015, the Company began executing the "Initiative". The Initiative is focused on effectively investing the Company’s capital by increasing the performance of its existing sites. The goal of the Initiative is to make strategic capital improvements aimed at increasing productivity of the existing portfolio while optimizing the Company’s margins and increasing cash flow. The Company continues to expect that the Initiative will provide a strong foundation of high performing assets that may be used to fund future growth. Stock-for-Stock Merger On November 1, 2016, the Company's Board of Directors approved a definitive agreement whereby Tecogen Inc would acquire all of the outstanding shares of American DG in a stock-for-stock merger. Under the agreement, each share of American DG common stock will be exchanged for 0.092 shares of Tecogen common stock, valuing American DG at an approximately 27% premium to the Company's closing share price on that day. This agreement is subject to a vote of security holders of both companies. The transaction is expected to close in the second quarter of 2017. On April 12, 2017, the Securities and Exchange Commission ("SEC") declared the registration statement on SEC Form S-4 filed with the SEC in connection with its merger with Tecogen Inc. effective. Notice of the Special Meeting and a definitive proxy statement/prospectus was mailed on or about April 27, 2017, to stockholders of the Company as of April 24, 2017. The Special Meeting will be held at the Company's principal executive offices at 45 First Avenue, Waltham, Massachusetts 02451, on Thursday, May 18, 2017, at 1 p.m., Eastern Time. Exchange of Shares of Subsidiary in Satisfaction of Indebtedness During the second and third quarters of 2016, the Company settled approximately $16 million of its $19.4 million 6% convertible debentures due May 2018, reducing future debt service requirements of the Company (see Note 5 "Convertible Debentures and Other Debt") by transferring ownership to the holders of the debt, shares of EuroSite Power, reducing the Company's ownership in EuroSite from 48% to just over 2% (see Note 4 "Investment in EuroSite Power and Discontinued Operations"). Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 . The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in American DG Energy Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016 . There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's 51.0% owned joint venture, American DG New York, LLC, or ADGNY. Investments in partnerships and companies in which the Company does not have a controlling financial interest but where we have significant influence are accounted for under the equity method. The Company’s operations are comprised of one business segment. The Company’s business is selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements. Reclassification Certain prior year amounts have been reclassified to conform with current year presentation.

Income (Loss) Per Common Share

Income (Loss) Per Common Share	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
Income (Loss) Per Common Share	Income (Loss) Per Common Share The Company computes basic income (loss) per share by dividing net income (loss) for the period by the weighted average number of shares of common stock outstanding during the period. The Company computes diluted earnings per common share using the treasury stock method. For purposes of calculating diluted earnings per share, the Company considers its shares issuable in connection with convertible debentures, stock options and warrants to be dilutive common stock equivalents when the exercise price is less than the average market price of its common stock for the period. For the three months ended March 31, 2017 , the Company excluded 4,739,270 potentially dilutive shares because such shares would be anti-dilutive. For the three months ended March 31, 2016 , the Company excluded 14,428,583 potentially dilutive shares because such shares would be anti-dilutive as a result of the reported net loss.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes in the accompanying unaudited condensed consolidated statements of operations for the three months ended March 31, 2017 and 2016 differ from that which would be expected by applying the federal statutory tax rate primarily due to losses and nontaxable income for which no benefit is recognized.

Investment in EuroSite Power an

Investment in EuroSite Power and Discontinued Operations	3 Months Ended
	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Investment in Eurosite Power and Discontinued Operations	Investment in EuroSite Power and Discontinued Operations During the second and third quarters of 2016, the Company settled approximately $16 million of the $19.4 million of its 6% convertible debentures due May 2018 (see Note 5 "Convertible Debentures and Other Debt") by transferring ownership of shares it owned of EuroSite Power Inc to the holders of the debt. As a result, the Company's ownership in EuroSite decreased from 48.04% to just over 2% . Prior to the foregoing exchanges, the Company consolidated the results of EuroSite under the variable interest model as it was determined to be the primary beneficiary of EuroSite. The exchanges were undertaken primarily as a plan to reduce future debt service requirements of the Company, however they also resulted in a disposition of all foreign operations of the Company, representing a strategic shift that will have a major effect on the Company's operations and financial results. Accordingly, amounts related to this component have been reported in discontinued operations in the accompanying condensed consolidated financial statements. As of June 30, 2016, the Company owned a 20.5% interest in the common stock of EuroSite Power which it accounted for using the equity method. Prior to June 28, 2016, the Company accounted for its investment in EuroSite Power as a consolidated subsidiary as it determined it was the primary beneficiary of EuroSite under the variable interest model. That determination included consideration of an implicit variable interest held by the Company in the form of a guarantee of the long-term convertible indebtedness of EuroSite Power. On June 28, 2016, substantially all of that convertible indebtedness was converted by the holders into shares of EuroSite Power, rendering the Company’s guarantee inconsequential in the determination. As a result, the Company concluded it no longer held a variable interest in EuroSite Power. The Company deconsolidated EuroSite Power in its consolidated financial statements. This required recording the remaining shares held at fair value as an equity method investment, which resulted in a gain of approximately $3.9 million . The Company utilized a market approach in determining the fair value of the shares retained which incorporated the quoted market price of the shares at the date of deconsolidation adjusted for volatility. As of September 30, 2016, the Company owned a 2.03% interest in the common stock of EuroSite Power. As such, the equity method of accounting was no longer appropriate in that the ability to exercise significant influence over EuroSite no longer exists at this level of ownership. The investment, since September 30, 2016 is accounted for as an available-for-sale security (see Note 7 "Fair Value Measurements"). The following is a reconciliation of the major line items comprising loss from discontinued operations for the three months ended March 31, 2016 : Revenue $ 687,032 Cost of sales $ 544,392 Operating expenses $ 521,511 Other expenses, net $ 12,590 Pretax loss from discontinued operations $ 391,461 Income tax benefit $ — Loss from discontinued operations $ 391,461 Loss from discontinued operations attributable to noncontrolling interest $ 203,403 Loss from discontinued operations attributable to American DG Energy Inc. $ 188,058 The total operating and investing cash flows of the discontinued operation for the three months ended March 31, 2016 is as follows: Net cash provided by operating activities $ 62,576 Net cash used in investing activities $ (211,453 )

Convertible Debentures (Notes)

Convertible Debentures (Notes)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Convertible Debentures	Convertible Debentures and Other Debt Convertible debenture 2016 transactions On May 4, 2016, the Company settled $9.3 million of its $19.4 million outstanding 6% convertible debentures due May 2018 (“convertible debentures” or “debt”) by transferring ownership of approximately 14.72 million shares it owned of EuroSite Power to the holders of the debt. As the shares used to extinguish the debt are considered nonmonetary assets, the overall gain realized of approximately $7.2 million is composed of two elements: (1) the gain resulting from the difference between the carrying value and the fair value of the shares transferred, of approximately $7.7 million and (2) the loss from the debt extinguishment of approximately $500,000 . As the Company retained its controlling financial interest in EuroSite Power following the transaction, no gain was recognized on the transaction, rather the gain was credited to additional paid-in capital in accordance with ASC 810-10-45-23. On September 30, 2016, the Company settled $6.7 million of its $10.1 million outstanding 6% convertible debentures due May 2018 by transferring ownership of 15.2 million shares it owned of EuroSite Power in exchange for the debt. A new note evidencing the remaining balance of the debt outstanding of $3,418,681 was issued, replacing the previous note. Interest on the debt was previously prepaid through maturity and the prepayment is reflected as a discount against the debt which is amortized to interest expense over the life of the debt. (see Note 4 "Investment in EuroSite Power and Discontinued Operations"). As the shares used to extinguish the debt are considered nonmonetary assets, the overall gain realized of $182,887 is composed of two elements: (1) the gain resulting from the difference between the carrying value and the fair value of the shares transferred, of $107,688 and, (2) the gain from the debt extinguishment of $75,199 . The total gain is recorded as a gain on extinguishment of debt in the consolidated statement of operations. On December 23, 2016, the Company repaid the remaining outstanding balance of its 2014 Convertible Debentures for $3,058,943 , representing payment in full of the remaining $3,418,681 net of remaining interest through maturity which had been previously prepaid. Loan due to related party On December 22, 2016, the Company entered into a Revolving Line of Credit Agreement ("Agreement") with John Hatsopoulos, the Company's co-Chief Executive Officer and member of the Company's board of directors. Under the terms of the Agreement, Mr. Hatsopoulos had agreed to lend the Company up to an aggregate of $3,000,000 , upon written request. On February 27, 2017, Mr. Hatsopoulos terminated the Revolving Line of Credit Agreement, allowing for payment of the outstanding balance of $850,000 to be made on the Maturity date. The borrowing bears interest at 6% , payable quarterly and matures on May 25, 2018. The Company may prepay any amount of the borrowing at any time without penalty. See Note 5 "Convertible Debentures and Other Debt".

Related parties

Related parties	3 Months Ended
	Mar. 31, 2017
Related Party Transactions [Abstract]
Related Parties	Related Parties EuroSite Power, Tecogen, Ilios Inc., or Ilios are affiliated companies by virtue of common ownership and/or common leadership. The Company purchases the majority of its cogeneration units from Tecogen, a related party sharing similar management. In addition, Tecogen pays certain operating expenses, including benefits and payroll, on behalf of the Company, and the Company leases office space from Tecogen. These costs were reimbursed by the Company. As of March 31, 2017 , the Company owed Tecogen $183,030 , and Tecogen owed the Company $52,067 . On December 22, 2016, the Company entered into a Revolving Line of Credit Agreement ("Agreement") with John Hatsopoulos, the Company's co-Chief Executive Officer and member of the Company's board of directors. Under the terms of the Agreement, Mr. Hatsopoulos had agreed to lend the Company up to an aggregate of $3,000,000 , upon written request. On February 27, 2017, Mr. Hatsopoulos terminated the Revolving Line of Credit Agreement, allowing for payment of the outstanding balance of $850,000 to be made on the Maturity date. The borrowing bears interest at 6% , payable quarterly and matures on May 25, 2018. The Company may prepay any amount of the borrowing at any time without penalty. See Note 5 "Convertible Debentures and Other Debt". On January 13, 2017, the Company sold certain items of equipment and a substantial portion of its parts inventory to Tecogen, which is a major supplier to the Company, at Tecogen's cost, which is generally manufacturer or wholesale cost rather than a retail cost. The sale was prompted out of a need for funds to retire existing long-term indebtedness of the Company. As a result, the Company has classified these items as assets held for sale at December 31, 2016 at fair value (see Note 7 "Fair Value Measurements"). For further description of certain related party transactions see Note 4 "Investment in EuroSite Power and Discontinued Operations" and Note 5 "Convertible Debentures and Other Debt".

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value topic of the FASB Accounting Standards Codification defines fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The accounting guidance also establishes a fair value hierarchy which requires an entity to maximize the use of observable inputs, where available, and minimize the use of unobservable inputs when measuring fair value. There are three levels of inputs that may be used to measure fair value: Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. The Company currently does not have any Level 1 financial assets or liabilities. Level 2 - Observable inputs other than quoted prices included in Level 1. Level 2 inputs include quoted prices for identical assets or liabilities in non-active markets, quoted prices for similar assets or liabilities in active markets and inputs other than quoted prices that are observable for substantially the full term of the asset or liability. Level 3 - Unobservable inputs reflecting management’s own assumptions about the input used in pricing the asset or liability. The following table presents the assets reported on the consolidated balance sheets measured at their fair value on both a recurring basis and a nonrecurring basis as of March 31, 2017 and December 31, 2016 by level within the fair value hierarchy. March 31, 2017 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs Total Level 1 Level 2 Level 3 Total gains (losses) Description Recurring fair value measurements Available-for-sale equity securities EuroSite Power Inc. $ 519,568 $ — $ — $ 519,568 $ (118,083 ) Total recurring fair value measurements $ 519,568 $ — $ — $ 519,568 $ (118,083 ) December 31, 2016 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs Total Level 1 Level 2 Level 3 Total gains (losses) Description Recurring fair value measurements Available-for-sale equity securities EuroSite Power Inc. $ 637,651 $ — $ — $ 637,651 $ (136,848 ) Total recurring fair value measurements $ 637,651 $ — $ — $ 637,651 $ (136,848 ) Nonrecurring fair value measurements Long-lived assets held and used(a) $ 681,577 $ — $ — $ 681,577 $ (503,072 ) Assets held for sale(b) 946,883 — — 946,883 (743,770 ) Total nonrecurring fair value measurements $ 1,628,460 $ — $ — $ 1,628,460 $ (1,246,842 ) (a) Long-lived assets held and used with a carrying amount of $1,184,649 were written down to their fair value of $681,577 , resulting in an impairment charge of $503,072 , which was included in earnings for the year ended December 31, 2016. (b) Assets held for sale with a carrying amount of $1,690,653 were written down to their fair value of $946,883 , resulting in a loss of $743,770 , which was included in earnings for the year ended December 31, 2016. In connection with the sale of certain equipment and inventory to Tecogen (see Note 6 "Related Parties"), the Company utilized a Level 3 category fair value measurement to value the assets classified as held for sale at December 31, 2016. That measurement was based on the manufactured or wholesale cost of such assets as this is the level at which the Company determined such assets could be sold in the market given the level of both functional and economic obsolescence, which results from the existence of newer, less expensive and more effective and efficient replacements. The Company utilizes a Level 3 category fair value measurement to value its investment in EuroSite Power as an available-for-sale security at period end (see Note 4 "Investment in EuroSite Power and Discontinued Operations"). That measurement is determined by management based on the average closing sales price in a 24 day trading period within quarter end, which is discounted by 10% to account for volatility. The following table summarizes changes in level 3 assets which are comprised of available-for-sale securities for the period: Initial establishment of fair value at September 30, 2016 - Carryover basis from equity method investment $ 624,499 Purchase of 300,000 shares at $0.50 per share 150,000 Unrealized loss recognized in other comprehensive income (136,848 ) Fair value at December 31, 2016 637,651 Unrealized loss recognized in other comprehensive income (118,083 ) Fair value at March 31, 2017 $ 519,568

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies The Company guarantees certain obligations of its former subsidiary EuroSite Power Inc. These guarantees include certain long term unsecured convertible indebtedness, with a remaining principal amount outstanding subject to the guarantee at March 31, 2017 of $300,000 with a maturity date of June 17, 2017; a payment performance guarantee in respect of collateralized equipment financing loans, with a remaining principal amount outstanding subject to the guarantee at March 31, 2017 is approximately $313,000 due ratably in equal installments through September 2021; and certain guarantees of performance in respect of certain customer contracts. Based on current conditions, the Company does not believe there to be any amounts probable of payment by the Company under any of the guarantees and has determined that the value associated with the non-contingent aspect of the guarantees is not significant. At this time the Company believes these guarantees are not material to its financial statements. In the ordinary course of its business, ADGE is involved in various legal proceedings involving a variety of matters. On or about February 6, 2017, ADGE, John Hatsopoulos, George N. Hatsopoulos, Charles T. Maxwell, Deanna M. Petersen, Christine Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen, and ADGE.Acquisition Corp., were served with a Verified Complaint by William C. May ("May"), individually and on behalf of the other shareholders of ADGE as a class. The action was commenced in the Business Litigation Session of the Superior Court of the Commonwealth of Massachusetts, Civil Action No. 17-0390. The complaint alleges the proposed Merger is subject to certain conflicts of interest; that ADGE's board failed to protect our stockholders by failing to conduct an auction or market check; that the Exchange Ratio undervalues ADGE's outstanding shares; that ADGE's directors breached their fiduciary duties in approving the Merger proposal; that Tecogen’s registration statement on Form S-4 contained material omissions; that Tecogen aided and abetted ADGE's board’s breaches of its fiduciary duties; and other claims. The plaintiff is seeking preliminary and permanent injunctions related to the Merger, rescissory damages, compensatory damages, accounting, and other relief. The May action is in its earliest stages. The state court denied plaintiff’s motion for expedited discovery. The defendants have not yet answered or otherwise responded to the complaint, and plaintiff has not yet filed a motion for injunctive relief. On or about February 15, 2017, a lawsuit was filed in the United States District Court for the District of Massachusetts by Lee Vardakas (“Vardakas”), individually and on behalf of other shareholders of ADGE, naming ADGE, John N. Hatsopoulos, George N. Hatsopoulos, Benjamin Locke, Charles T. Maxwell, Deanne M. Petersen, Christine M. Klaskin, John Rowe, Joan Giacinti, Elias Samaras, Tecogen Inc., Tecogen.ADGE Acquisition Corp., and Cassel Salpeter & Co., LLC, as defendants. Among other things, the complaint alleges (1) the merger is the result of a flawed and conflicted sales process and that the Exchange Ratio undervalues ADGE’s outstanding shares and (2) the registration statement on Form S-4 contains materially incomplete and misleading information concerning: (a) the financial analyses performed by ADGE’s financial advisor, (b) financial projections for ADGE and Tecogen, and (c) conflicts of interest in the sales process. The complaint asserts that defendants violated Section 14(a)(1) of the Securities Exchange Act of 1934, as amended (“Exchange Act”), and Rule 14a-9 thereunder, as a result of the alleged materially incomplete and misleading information; that the directors and officers of ADGE have control person liability for the alleged material misstatements and omissions pursuant to Section 20(a) of the Exchange Act; that the directors of ADGE breached their fiduciary duties to ADGE’s stockholders related to the merger, including that they failed to take steps to obtain the highest possible consideration for ADGE shareholders in the transaction; that Mr. John Hatsopoulos and Mr. George Hatsopoulos, acting in concert and as a group, as controlling shareholders of ADGE, violated their fiduciary duties to the shareholders of ADGE; and that Mr. George Hatsopoulos, Tecogen.ADGE Acquisition Corp., and ADGE’s financial advisor aided and abetted breaches of fiduciary duties by the directors and officers of ADGE. Vardakas is seeking to certify a class action, a preliminary injunction, damages, costs and disbursements, including reasonable attorneys’ fees, and such other relief as the court deems just and proper. The Vardakas action is in its earliest phase. The defendants have not yet answered or otherwise responded to the complaint, and plaintiff has not yet filed a motion for injunctive relief.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 12, 2017, the Securities and Exchange Commission ("SEC") declared the registration statement on Form S-4 filed with the SEC in connection with its merger with Tecogen Inc. effective. Notice of the Special Meeting and a definitive proxy statement/prospectus was mailed on or about April 27, 2017, to stockholders of the Company as of April 24, 2017. The Special Meeting will be held at the Company's principal executive offices at 45 First Avenue, Waltham, Massachusetts 02451, on Thursday, May 18, 2017, at 1 p.m., Eastern Time. The Company has evaluated subsequent events through the date of this filing and determined that no other subsequent events occurred that would require recognition in the condensed consolidated financial statements or disclosure in the notes thereto other than those disclosed in the notes to these condensed consolidated financial statements.

Description of Business and B15

Description of Business and Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of Business	American DG Energy Inc., or the Company, we, our or us, distributes, owns, operates and maintains clean, on-site energy systems that produce electricity, hot water, heat and cooling. The Company's business model is to own the equipment that it installs at customers' facilities and to sell the energy produced by these systems to its customers on a long-term contractual basis at prices guaranteed to the customer to be below conventional utility rates. The Company calls this business the American DG Energy “On-Site Utility”. The Company was incorporated as a Delaware corporation on July 24, 2001 to install, own, operate and maintain complete DG systems, or energy systems, and other complementary systems at customer sites and sell electricity, hot water, heat and cooling energy under long-term contracts at prices guaranteed to the customer to be below conventional utility rates. The Company derives revenues from selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term energy sales agreements (with a typical term of 10 to 15 years). The energy systems are generally owned by the Company and are installed in its customers’ buildings. Each month the Company obtains readings from energy meters to determine the amount of energy produced for each customer. The Company multiplies these readings by the appropriate published price of energy (electricity, natural gas or oil) from its customers’ local energy utility, to derive the value of its monthly energy sale, less the applicable negotiated discount. The Company’s revenues per customer on a monthly basis vary based on the amount of energy produced by its energy systems and the published price of energy (electricity, natural gas or oil) from its customers’ local energy utility that month. The Company’s revenues commence as new energy systems become operational. As of March 31, 2017 , the Company had 92 energy systems operational. In some cases the customer may choose to own the system rather than have it owned by American DG Energy. The Company has experienced total net losses since inception of approximately $42 million . For the next twelve months, the Company expects to experience continuing net losses as its management executes the current business plan. The Company believes that its existing resources, including cash and cash equivalents and future cash flow from operations, plus cash provided by the sale of certain inventory are sufficient to meet the working capital requirements of its existing business for the next twelve months; however, as the Company continues to grow its business by adding more energy systems, the cash requirements will increase, and the Company may need to raise additional capital through debt financings or equity offerings to meet its operating and capital needs. There can be no assurance, however, that the Company will be successful in its fundraising efforts or that additional funds will be available on acceptable terms, if at all. In 2015, the Company began executing the "Initiative". The Initiative is focused on effectively investing the Company’s capital by increasing the performance of its existing sites. The goal of the Initiative is to make strategic capital improvements aimed at increasing productivity of the existing portfolio while optimizing the Company’s margins and increasing cash flow. The Company continues to expect that the Initiative will provide a strong foundation of high performing assets that may be used to fund future growth.
Basis of Presentation	The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation have been included. Operating results for the three months ended March 31, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 . The condensed consolidated balance sheet at December 31, 2016 has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by generally accepted accounting principles for complete financial statements. For further information, refer to the consolidated financial statements and footnotes thereto included in American DG Energy Inc.’s Annual Report on Form 10-K for the year ended December 31, 2016 . There have been no significant changes in accounting principles, practices or methods for making estimates. The accompanying unaudited condensed consolidated financial statements include the accounts of the Company and entities in which it has a controlling financial interest. Those entities include the Company's 51.0% owned joint venture, American DG New York, LLC, or ADGNY. Investments in partnerships and companies in which the Company does not have a controlling financial interest but where we have significant influence are accounted for under the equity method. The Company’s operations are comprised of one business segment. The Company’s business is selling energy in the form of electricity, heat, hot water and cooling to its customers under long-term sales agreements.

Investment in Eurosite Power 16

Investment in Eurosite Power and Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Activity of Discontinued Operations	The following is a reconciliation of the major line items comprising loss from discontinued operations for the three months ended March 31, 2016 : Revenue $ 687,032 Cost of sales $ 544,392 Operating expenses $ 521,511 Other expenses, net $ 12,590 Pretax loss from discontinued operations $ 391,461 Income tax benefit $ — Loss from discontinued operations $ 391,461 Loss from discontinued operations attributable to noncontrolling interest $ 203,403 Loss from discontinued operations attributable to American DG Energy Inc. $ 188,058 The total operating and investing cash flows of the discontinued operation for the three months ended March 31, 2016 is as follows: Net cash provided by operating activities $ 62,576 Net cash used in investing activities $ (211,453 )

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis	The following table presents the assets reported on the consolidated balance sheets measured at their fair value on both a recurring basis and a nonrecurring basis as of March 31, 2017 and December 31, 2016 by level within the fair value hierarchy. March 31, 2017 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs Total Level 1 Level 2 Level 3 Total gains (losses) Description Recurring fair value measurements Available-for-sale equity securities EuroSite Power Inc. $ 519,568 $ — $ — $ 519,568 $ (118,083 ) Total recurring fair value measurements $ 519,568 $ — $ — $ 519,568 $ (118,083 ) December 31, 2016 Quoted prices in active markets for identical assets Significant other observable inputs Significant unobservable inputs Total Level 1 Level 2 Level 3 Total gains (losses) Description Recurring fair value measurements Available-for-sale equity securities EuroSite Power Inc. $ 637,651 $ — $ — $ 637,651 $ (136,848 ) Total recurring fair value measurements $ 637,651 $ — $ — $ 637,651 $ (136,848 ) Nonrecurring fair value measurements Long-lived assets held and used(a) $ 681,577 $ — $ — $ 681,577 $ (503,072 ) Assets held for sale(b) 946,883 — — 946,883 (743,770 ) Total nonrecurring fair value measurements $ 1,628,460 $ — $ — $ 1,628,460 $ (1,246,842 ) (a) Long-lived assets held and used with a carrying amount of $1,184,649 were written down to their fair value of $681,577 , resulting in an impairment charge of $503,072 , which was included in earnings for the year ended December 31, 2016. (b) Assets held for sale with a carrying amount of $1,690,653 were written down to their fair value of $946,883 , resulting in a loss of $743,770 , which was included in earnings for the year ended December 31, 2016.
Fair Value of Investments	The following table summarizes changes in level 3 assets which are comprised of available-for-sale securities for the period: Initial establishment of fair value at September 30, 2016 - Carryover basis from equity method investment $ 624,499 Purchase of 300,000 shares at $0.50 per share 150,000 Unrealized loss recognized in other comprehensive income (136,848 ) Fair value at December 31, 2016 637,651 Unrealized loss recognized in other comprehensive income (118,083 ) Fair value at March 31, 2017 $ 519,568

Description of Business and B18

Description of Business and Basis of Presentation (Details)	Nov. 01, 2016	Sep. 30, 2016USD ($)	May 04, 2016USD ($)	Mar. 31, 2017USD ($)segmentenergy_system	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Jun. 30, 2016	Mar. 31, 2016
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Number of energy systems installed | energy_system				92
Accumulated deficit				$ (42,025,342)		$ (41,381,221)
Premium over share closing price (percent)	27.00%
Number of operating segments | segment				1
American DG New York, LLC
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Percentage of owned subsidiary				51.00%
6% Convertible Debentures | EuroSite Power Inc.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Amount of debt converted to equity		$ 6,700,000	$ 9,300,000		$ 16,000,000
Convertible debentures		$ 10,100,000	$ 19,400,000		$ 10,100,000
Interest rate on convertible debt (percent)		6.00%	6.00%	6.00%
Minimum
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Length of long term energy sales agreement				10 years
Maximum
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Length of long term energy sales agreement				15 years
Common Stock
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Conversion ratio of Amercan DG shares to Tecogen shares	0.092
EuroSite Power, Inc.
Subsidiary of Limited Liability Company or Limited Partnership [Line Items]
Ownership interest in EuroSite Power as equity method investment (percent)				48.04%			20.50%	48.00%
Ownership interest in Eurosite Power after debt settlement (percent)		2.03%		2.00%	2.03%

Income (Loss) Per Common Share

Income (Loss) Per Common Share (Details) - shares	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Potentially dilutive securities excluded from computation of earnings per share	4,739,270	14,428,583

Investment in EuroSite Power 20

Investment in EuroSite Power and Discontinued Operations (Details) - USD ($) $ in Millions	Sep. 30, 2016	Jun. 28, 2016	May 04, 2016	Mar. 31, 2017	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016
Schedule of Equity Method Investments [Line Items]
Gain on deconsolidation		$ 3.9
EuroSite Power, Inc.
Schedule of Equity Method Investments [Line Items]
Ownership interest in EuroSite Power as equity method investment (percent)				48.04%		20.50%	48.00%
Ownership interest in Eurosite Power after debt settlement (percent)	2.03%			2.00%	2.03%
6% Convertible Debentures | EuroSite Power Inc.
Schedule of Equity Method Investments [Line Items]
Amount of debt converted to equity	$ 6.7		$ 9.3		$ 16
Convertible debentures	$ 10.1		$ 19.4		$ 10.1
Interest rate on convertible debt (percent)	6.00%		6.00%	6.00%

Investment in EuroSite Power 21

Investment in EuroSite Power and Discontinued Operations - Activity of Discontinued Operation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Revenue		$ 687,032
Cost of sales		544,392
Operating expenses		521,511
Other expenses, net		12,590
Pretax loss from discontinued operations		391,461
Income tax benefit		0
Loss from discontinued operations		391,461
Loss from discontinued operations attributable to noncontrolling interest		203,403
Loss from discontinued operations attributable to American DG Energy Inc.	$ 0	188,058
Net cash provided by operating activities		62,576
Net cash used in investing activities		$ (211,453)

Convertible Debentures (Details

Convertible Debentures (Details) - USD ($) shares in Thousands	Feb. 27, 2017	Sep. 30, 2016	May 04, 2016	Mar. 31, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 22, 2016
Debt Instrument [Line Items]
Proceeds from Convertible Debt						$ 3,058,943
EuroSite Power Inc. | 6% Convertible Debentures
Debt Instrument [Line Items]
Amount of debt converted to equity		$ 6,700,000	$ 9,300,000		$ 16,000,000
Convertible debentures		$ 10,100,000	$ 19,400,000		10,100,000
Interest rate on convertible debt (percent)		6.00%	6.00%	6.00%
Shares issued in conversion of debt (shares)		15,200	14,720
Gain on conversion of debt			$ 7,200,000	$ 182,887
Gain on shares transferred			7,700,000	107,688
Loss on extinguishment of debt			$ 500,000	$ 75,199
Debt outstanding		$ 3,418,681			$ 3,418,681
Chief Executive Officer
Debt Instrument [Line Items]
Proceeds from related party debt	$ 850,000
Annual interest percentage (percent)				6.00%
Revolving Credit Facility | Chief Executive Officer
Debt Instrument [Line Items]
Revolving line of credit maximum borrowing capacity							$ 3,000,000

Related parties (Details)

Related parties (Details) - USD ($)	Feb. 27, 2017	Mar. 31, 2017	Dec. 22, 2016
Affiliated Entity | Tecogen
Related Party Transaction [Line Items]
Due to related parties		$ 183,030
Due from related parties		$ 52,067
Chief Executive Officer
Related Party Transaction [Line Items]
Proceeds from related party debt	$ 850,000
Annual interest percentage (percent)		6.00%
Chief Executive Officer | Revolving Credit Facility
Related Party Transaction [Line Items]
Revolving line of credit maximum borrowing capacity			$ 3,000,000

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses) on available-for-sale equity securities	$ (118,083)	$ 0	$ (136,848)
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses) on available-for-sale equity securities	(118,083)		(136,848)
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	0		0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	0		0
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	519,568		637,651
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains and losses on long-lived assets held-for-use			(503,072)
Total gains (losses) on assets held-for-sale			(743,770)
Total nonrecurring fair value measurements			(1,246,842)
Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements			0
Long-lived assets held and used			0
Assets held-for-sale			0
Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements			0
Long-lived assets held and used			0
Assets held-for-sale			0
Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements			1,628,460
Long-lived assets held and used			681,577
Assets held-for-sale			946,883
Eurosite Power Inc. | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total gains (losses) on available-for-sale equity securities	(118,083)		(136,848)
Eurosite Power Inc. | Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0		0
Eurosite Power Inc. | Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	0		0
Eurosite Power Inc. | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	519,568		637,651	$ 624,499
Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used			1,184,649
Assets held-for-sale			1,690,653
Fair Value | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements	519,568		637,651
Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total recurring fair value measurements			1,628,460
Long-lived assets held and used			681,577
Assets held-for-sale			946,883
Fair Value | Eurosite Power Inc. | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale equity securities	$ 519,568		$ 637,651

Fair Value Measurements - Narr

Fair Value Measurements - Narrative (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2017trading_day	Dec. 31, 2016USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Volatility factor (percent)	10.00%
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets held-for-use		$ 503,072
Impairment of long-lived assets held-for-sale		743,770
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used		681,577
Assets held-for-sale		946,883
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 | Eurosite Power Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of trading days included in fair value measurement | trading_day	24
Carrying Amount | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used		1,184,649
Assets held-for-sale		1,690,653
Fair Value | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets held and used		681,577
Assets held-for-sale		$ 946,883

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 Assets (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Fair Value, Changes in Level 3 Assets [Roll Forward]
Unrealized loss recognized in other comprehensive income	$ (118,083)	$ 0	$ (136,848)
Fair Value, Measurements, Recurring
Fair Value, Changes in Level 3 Assets [Roll Forward]
Unrealized loss recognized in other comprehensive income	(118,083)		(136,848)
Eurosite Power Inc.
Fair Value, Changes in Level 3 Assets [Roll Forward]
Purchase of 300,000 shares at $0.50 per share			$ 150,000
Shares purchased (shares)			300,000
Shares purchased (in USD per share)			$ 0.50
Eurosite Power Inc. | Fair Value, Measurements, Recurring
Fair Value, Changes in Level 3 Assets [Roll Forward]
Unrealized loss recognized in other comprehensive income	(118,083)		$ (136,848)
Eurosite Power Inc. | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Changes in Level 3 Assets [Roll Forward]
Available-for-sale securities, beginning of period	637,651
Available-for-sale securities, end of period	$ 519,568		$ 637,651

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	Mar. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
Guarantee of long-term unsecured convertible debt of EuroSite Power, Inc.	$ 300
Payment performance guarantee for equipment loans for Eurosite Power, Inc.	$ 313