Acorn Energy (ACFN) 10-Q 15 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	11-May-15
Document And Entity Information
Entity Registrant Name	ACORN ENERGY, INC.
Entity Central Index Key	880984
Document Type	10-Q
Document Period End Date	31-Mar-15
Amendment Flag	FALSE
Current Fiscal Year End Date	-19
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		26,475,591
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2015

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (Unaudited) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Current assets:
Cash and cash equivalents	$2,099	$4,821
Restricted deposit	457	467
Accounts receivable, net of provisions for doubtful accounts of $143 at December 31, 2014 and March 31, 2015	5,335	4,902
Unbilled revenue	7,685	7,890
Inventory	1,330	1,374
Other current assets	1,877	1,813
Current assets - discontinued operations	141	143
Total current assets	18,924	21,410
Property and equipment, net	1,101	1,080
Severance assets	3,261	3,256
Restricted deposits	656	650
Intangible assets, net	1,127	1,211
Goodwill	1,019	1,031
Other assets	811	905
Total assets	26,899	29,543
Current liabilities:
Short-term bank credit and current maturities of long-term debt	4,528	4,419
Accounts payable	2,511	2,187
Accrued payroll, payroll taxes and social benefits	1,642	1,584
Deferred revenue	1,177	1,634
Other current liabilities	3,518	3,028
Current liabilities - discontinued operations	4,372	4,693
Total current liabilities	17,748	17,545
Long-term liabilities:
Accrued severance	4,590	4,594
Other long-term liabilities	956	1,011
Total long-term liabilities	5,546	5,605
Commitments and contingencies
Equity:
Acorn Energy, Inc. shareholders Common stock - $0.01 par value per share: Authorized - 30,000,000 shares; Issued -27,277,511 shares at December 31, 2014 and March 31, 2015	272	272
Additional paid-in capital	97,815	97,607
Warrants	1,641	1,641
Accumulated deficit	-89,361	-86,592
Treasury stock, at cost - 801,920 shares at December 31, 2014 and March 31, 2015	-3,036	-3,036
Accumulated other comprehensive loss	-282	-212
Total Acorn Energy, Inc. shareholders' equity	7,049	9,680
Non-controlling interests	-3,444	-3,287
Total equity	3,605	6,393
Total liabilities and equity	$26,899	$29,543

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Accounts receivable, net of provisions for doubtful accounts	$143	$143
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	27,277,511	27,277,511
Treasury stock, shares	801,920	801,920

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (Unaudited) (USD $)	3 Months Ended
In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues:
Projects	$2,966	$2,792
Products	1,133	1,203
Services	519	459
Total revenues	4,618	4,454
Cost of sales:
Projects	2,179	1,960
Products	800	951
Services	120	113
Total cost of sales	3,099	3,024
Gross profit	1,519	1,430
Operating expenses:
Research and development expenses, net of credits	565	727
Selling, general and administrative expenses	2,781	3,318
Total operating expenses	3,346	4,045
Operating loss	-1,827	-2,615
Finance income (expense), net	12	-59
Loss before income taxes	-1,815	-2,674
Income tax benefit	33	55
Net loss from continuing operations	-1,782	-2,619
Loss from discontinued operations, net of income taxes	-1,152	-1,956
Net loss	-2,934	-4,575
Non-controlling interest share of net loss - continuing operations	20	25
Non-controlling interest share of net loss - discontinued operations	145	246
Net loss attributable to Acorn Energy, Inc. shareholders	($2,769)	($4,304)
Basic and diluted net loss per share attributable to Acorn Energy, Inc. shareholders:
Continuing operations	($0.07)	($0.11)
Discontinued operations	($0.04)	($0.08)
Total attributable to Acorn Energy, Inc. shareholders	($0.11)	($0.19)
Weighted average number of shares outstanding attributable to Acorn Energy, Inc. shareholders - basic and diluted	26,476	22,171

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Loss (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Condensed Consolidated Statements Of Comprehensive Loss
Net loss attributable to Acorn Energy, Inc. shareholders	($2,769)	($4,304)
Other comprehensive income (loss):
Foreign currency translation adjustments	-68	78
Comprehensive loss	-2,837	-4,226
Comprehensive income attributable to non-controlling interests	-2	2
Comprehensive loss attributable to Acorn Energy, Inc. shareholders	($2,839)	($4,224)

Condensed_Consolidated_Stateme2

Condensed Consolidated Statement of Changes in Equity (Unaudited) (USD $)	Common Stock [Member]	Additional Paid-in Capital [Member]	Warrants [Member]	Accumulated Deficit [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total Acorn Energy, Inc. Shareholders' Equity [Member]	Non-controlling Interests [Member]	Total Equity [Member]
In Thousands, except Share data
Balances at Dec. 31, 2014	$272	$97,607	$1,641	($86,592)	($3,036)	($212)	$9,680	($3,287)	$6,393
Balances, shares at Dec. 31, 2014	27,278
Net loss				-2,769			-2,769	-165	-2,934
Differences from translation of subsidiaries' financial statements						-70	-70	2	-68
Stock option compensation		208					208		208
Stock option compensation of subsidiaries								6	6
Balances at Mar. 31, 2015	$272	$97,815	$1,641	($89,361)	($3,036)	($282)	$7,049	($3,444)	$3,605
Balances, shares at Mar. 31, 2015	27,278

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Cash flows used in operating activities:
Net loss	($2,934)	($4,575)
Adjustments to reconcile net loss to net cash used in operating activities (see Schedule A)	1,826	3,398
Net cash used in operating activities - continuing operations	-1,108	-1,177
Net cash used in operating activities - discontinued operations	-1,430	-2,604
Net cash used in operating activities	-2,538	-3,781
Cash flows provided by (used in) investing activities:
Acquisitions of property and equipment	-80	-206
Restricted deposits	-98	-590
Release of restricted deposits	99	74
Amounts funded for severance assets	-91	-33
Net cash used in investing activities - continuing operations	-170	-755
Net cash used in investing activities - discontinued operations		-134
Net cash used in investing activities	-170	-889
Cash flows provided by (used in) financing activities:
Short-term bank credit, net	112	342
Repayments of long-term debt	-32
Net cash provided by financing activities - continuing operations	80	342
Net cash used in financing activities - discontinued operations		-130
Net cash provided by financing activities	80	212
Effect of exchange rate changes on cash and cash equivalents	-59	10
Net decrease in cash and cash equivalents	-2,687	-4,448
Cash and cash equivalents at the beginning of the year - discontinued operations	52	748
Cash and cash equivalents at the beginning of the year - continuing operations	4,821	16,531
Cash and cash equivalents at the end of the period - discontinued operations	87	9
Cash and cash equivalents at the end of the period - continuing operations	2,099	12,822
A. Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Loss from discontinued operations	1,152	1,956
Depreciation and amortization	132	195
Increase in accrued severance	109	39
Stock-based compensation	208	310
Deferred taxes	-33	-57
Other	10	-3
Change in operating assets and liabilities:
Decrease (increase) in accounts receivable, unbilled revenue, other current and other assets	-184	2,021
Decrease in inventory	36	37
Increase (decrease) in accounts payable, accrued payroll, payroll taxes and social benefits, deferred revenues, other current liabilities and other liabilities	396	-1,100
Adjustments to reconcile net loss to net cash provided by (used in) operating activities, total	$1,826	$3,398

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	NOTE 1—BASIS OF PRESENTATION
	The accompanying unaudited condensed consolidated financial statements of Acorn Energy, Inc. and its subsidiaries (the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Article 8 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete consolidated financial statements. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation have been included. Operating results for the three month period ended March 31, 2015 are not necessarily indicative of the results that may be expected for the year ending December 31, 2015. All dollar amounts in the notes to the condensed consolidated financial statements are in thousands except for per share data.
	Certain reclassifications have been made to the Company’s condensed consolidated financial statements for the three month period ended March 31, 2014 to conform to the current period’s condensed consolidated financial statement presentation. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and footnotes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

Recent_Authoritative_Guidance

Recent Authoritative Guidance	3 Months Ended
	Mar. 31, 2015
Accounting Changes and Error Corrections [Abstract]
Recent Authoritative Guidance	NOTE 2—RECENT AUTHORITATIVE GUIDANCE
	There have been no recent accounting pronouncements or changes in accounting pronouncements during the three months ended March 31, 2015, that are of material significance, or have potential material significance, to the Company.

Liquidity

Liquidity	3 Months Ended
	Mar. 31, 2015
Liquidity
Liquidity	NOTE 3—LIQUIDITY
	The Company believes that it will have sufficient liquidity to finance its activities and the activities of GridSense and OmniMetrix over at least the next 12 months based upon its current cash balance and the support expected to be provided by DSIT. If the support expected to be provided by DSIT (up to $5,000 in 2015) is not available in sufficient amounts, Acorn may not be able to fund its own corporate activities and Acorn may not be able to fund GridSense and OmniMetrix as it has historically which could materially impact the carrying value of these subsidiaries and their ability to continue operations.

Discontinued_Operations

Discontinued Operations	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations	NOTE 4—Discontinued Operations
	The Company’s Board of Directors recently decided that it would no longer continue to fund USSI’s activities following the recent significant decline in oil prices which led to significantly reduced demand for USSI’s products. USSI has suspended operations and terminated substantially all employees. The Company intends to sell its USSI assets and is exploring ways to maximize value for creditors and other stakeholders, expecting that most of the proceeds from any sale of its assets will be used to pay creditors. It is uncertain whether there will be any proceeds available to Acorn Energy or other USSI shareholders.
	Assets and liabilities related to the discontinued operations of USSI are as follows:
		As of
		31-Dec-14			31-Mar-15
	Cash and cash equivalents	$	52		$	87
	Other current assets		91			54
	Total assets	$	143		$	141
	Short-term bank credit	$	1,460		$	1,460
	Accounts payable		1,006			1,001
	Accrued payroll, payroll taxes and social benefits		346			90
	Other current liabilities		1,881			1,821
	Total liabilities	$	4,693		$	4,372
	USSI has granted a lien to its bank on substantially all of its assets including intellectual property. The debt due to the bank under USSI’s line-of-credit ($1,460) has matured, is currently due and is bearing interest at the default rate of 11.5% per annum. The Company has not guaranteed the line-of-credit.
	USSI’s losses for the three months ended March 31, 2014 and 2015 are included in “Loss from discontinued operations, net of income taxes” in the Company’s Condensed Consolidated Statements of Operations. Summarized financial information for USSI’s operations for the three months ended March 31, 2014 and 2015 are presented below:
		Three months ended
		March 31,
		2014			2015
	Revenues	$	—		$	—
	Gross profit	$	(188	)	$	(90	)
	Net loss	$	(1,956	)	$	(1,152	)
	Net loss attributable to non-controlling interests		246			145
	Net loss attributable to Acorn Energy Inc.	$	(1,710	)	$	(1,007	)

Restructuring_and_Related_Char

Restructuring and Related Charges	3 Months Ended
	Mar. 31, 2015
Restructuring and Related Activities [Abstract]
Restructuring and Related Charges	NOTE 5—RESTRUCTURING AND RELATED CHARGES
	(a) GridSense®
	In 2013 and 2014, the Company’s GridSense segment restructured operations in both its U.S. and Australian entities. This action was taken primarily in order to improve efficiency based on GridSense’s revenue mix and skills mix. The restructurings included terminations of employees in both the United States and Australia and a shut-down of GridSense’s Australian offices in an effort to further reduce costs and streamline operations. GridSense continues to sell its current products in Australia and the surrounding areas through a network of distributors.
	At December 31, 2014, $38 of the costs associated with employee severance and termination benefits charge remained unpaid. During the three months ended March 31, 2015, GridSense made no additional payments. The $38 of remaining accrued restructuring charge is expected to be paid in full by March 31, 2016. The balance is included in Other current liabilities in the Company’s condensed consolidated balance sheets.
	(b) OmniMetrixTM
	In 2013, OmniMetrix restructured its operations to better align expenses with revenues following a change in management. The restructuring involved employee severance and termination benefits as well as a charge for a significant reduction in the utilization of its leased facility in Buford and a write-down of a majority of the remaining book value of leasehold improvements associated with the leased facility. At December 31, 2014, $248 of lease payments associated with the reduced utilization of leased facilities remained unpaid. During the three months ended March 31, 2015, OmniMetrix paid $11 of this liability. The total remaining accrued restructuring balance of $237 is expected to be paid in full by December 31, 2019 and is included in Other current liabilities ($44) and Other liabilities ($193) in the Company’s condensed consolidated balance sheets.

Inventory_Net

Inventory, Net	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Inventory, Net	NOTE 6—INVENTORY, NET
	The composition of inventory is as follows:
		As of		As of
		31-Dec-14		31-Mar-15
	Raw materials	$	682	$	660
	Work-in-process		275		406
	Finished goods		417		264
		$	1,374	$	1,330
	At December 31, 2014 and March 31, 2015, the Company’s inventory reserve was $319 and $302, respectively.

Goodwill_and_Intangible_Assets

Goodwill and Intangible Assets	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets	NOTE 7—GOODWILL AND INTANGIBLE ASSETS
	(a) Goodwill
	The changes in the carrying amounts of goodwill by segment from December 31, 2014 to March 31, 2015 were as follows:
		Energy & Security Sonar Solutions segment			GridSense segment			Total
	Balance at December 31, 2014	$	518		$	513		$	1,031
	Translation adjustment		(12	)		—			(12	)
	Balance at March 31, 2015	$	506		$	513		$	1,019
	(b) Intangibles
	The changes in the carrying amounts and accumulated amortization of intangible assets from December 31, 2014 to March 31, 2015 were as follows:
		Cost			Accumulated amortization			Total
	Balance as of December 31, 2014	$	2,175		$	(964	)	$	1,211
	Amortization		—			(47	)		(47	)
	Cumulative translation adjustment		(74	)		37			(37	)
	Balance as of March 31, 2015	$	2,101		$	(974	)	$	1,127
	The Company’s intangibles are in its GridSense segment and include software, customer relationships and trade name. The weighted average estimated useful life of the intangibles is 11.1 years. Amortization expense for the three months ended March 31, 2014 and 2015 amounted to $70 and $47, respectively. Amortization expense with respect to intangible assets is estimated to be $185 for each of the years ending March 31, 2016 through 2020.

Equity

Equity	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Equity	NOTE 8—EQUITY
	(a) Acorn Stock Options
	A summary of stock option activity for the three months ended March 31, 2015 is as follows:
		Number			Weighted		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
		of Options			Average
		(in shares)			Exercise
					Price Per Share
	Outstanding at December 31, 2014		1,812,428		$	4.51
	Granted		662,654		$	0.77
	Exercised		—			—
	Forfeited or expired		(86,830	)	$	3.12
	Outstanding at March 31, 2015		2,388,252		$	3.52		5.8 years	$	—
	Exercisable at March 31, 2015		1,198,570		$	5.28		3.8 years	$	—
	The fair value of the options granted ($0.52 per option during the three months ended March 31, 2015) was estimated on the grant dates using the Black-Scholes option-pricing model with the following weighted average assumptions:
	Risk-free interest rate		2.1	%
	Expected term of options		8.7 years
	Expected annual volatility		63	%
	Expected dividend yield		—	%
	(b) Stock-based Compensation Expense
	Stock-based compensation expense included in Selling, general and administrative expenses in the Company’s Condensed Statements of Operations for the three month periods ended March 31, 2014 and 2015 was $310 and $208, respectively. In addition, $32 and $6 was recorded in the Company’s USSI subsidiary included in Discontinued Operations for the three month periods ended March 31, 2014 and 2015, respectively. See Note 4.
	(c) Warrants
	The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance. A summary of warrant activity follows:
		Number			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life
		of Warrants
		(in shares)
	Outstanding at December 31, 2014		2,642,423		$	1.5
	Granted		—
	Exercised		—			—
	Forfeited or expired		—			—
	Outstanding at March 31, 2015		2,642,423		$	1.5		4.9 years

Fair_Value_Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 9—FAIR VALUE MEASUREMENTS
	Financial items measured at fair value are classified in the table below in accordance with the hierarchy established in applicable accounting principles.
		As at March 31, 2015
		Level 1		Level 2		Level 3			Total
	Restricted deposits – current and non-current	$	1,113	$	—	$	—		$	1,113
	Derivative assets (liabilities)		2		—		(78	)		(76	)
	Total	$	1,115	$	—	$	(78	)	$	1,037
		As at December 31, 2014
		Level 1		Level 2		Level 3			Total
	Restricted deposits – current and non-current	$	1,117	$	—	$	—		$	1,117
	Derivative assets (liabilities)		5		—		(50	)		(45	)
	Total	$	1,122	$	—	$	(50	)	$	1,072

Segment_Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Reporting	NOTE 10—SEGMENT REPORTING
	The Company currently operates in three reportable operating segments:
		●	Energy & Security Sonar Solutions. The Company provides sonar and acoustic related solutions for energy, defense and commercial markets with a focus on underwater site security for strategic energy installations and other advanced acoustic systems and real-time embedded hardware and software development and production through its DSIT Solutions Ltd. (“DSIT”) subsidiary.
		●	Smart Grid Distribution Automation. These products and services are provided by the Company’s GridSenseTM subsidiaries (GridSense Inc. in the United States and GridSense Pty Ltd. and CHK GridSense Pty Ltd. in Australia - collectively “GridSense”) which develop, market and sell remote monitoring and control systems to electric utilities and industrial facilities worldwide.
		●	Machine-to-Machine Critical Asset Monitoring & Control (“M2M”). The M2M segment provides wireless remote monitoring and control systems and services for critical assets as well as Internet of Things applications. These activities are performed through the Company’s OmniMetrix subsidiary.
	Other operations include certain IT activities (protocol management software for cancer patients and billing software) and outsourced consulting activities performed by the Company’s DSIT subsidiary as well as pipeline monitoring activities in the Company’s OmniMetrix subsidiary (for remote monitoring of cathodic protection systems on gas pipelines for gas utilities and pipeline companies) that do not meet the quantitative thresholds under applicable accounting principles.
			Energy& Security Sonar Solutions			GridSense			M2M			Other			Total
	Three months ended March 31, 2015
	Revenues from external customers		$	2,660		$	908		$	553		$	497		$	4,618
	Intersegment revenues			—			—			—			—			—
	Segment gross profit			605			277			340			297			1,519
	Depreciation and amortization			45			57			18			11			131
	Segment net income (loss) before income taxes			(294	)		(325	)		(278	)		105			(792	)
	Three months ended March 31, 2014
	Revenues from external customers		$	2,515		$	963		$	508		$	468		$	4,454
	Intersegment revenues			—			—			—			—			—
	Segment gross profit (loss)			686			185			312			247			1,430
	Depreciation and amortization			71			65			17			14			167
	Segment net loss before income taxes			(208	)		(973	)		(403	)		(21	)		(1,605	)
	Reconciliation of Segment Income (Loss) to Consolidated Net Loss Before Income Taxes
			Three months ended
			March 31,
			2014			2015
	Total net loss before income taxes for reportable segments		$	(1,584	)	$	(897	)
	Other operational segment net income (loss) before income taxes			(21	)		105
	Total segment net loss before income taxes			(1,605	)		(792	)
	Unallocated cost of corporate headquarters*			(1,043	)		(1,033	)
	Unallocated benefit (cost) of DSIT headquarters			(26	)		10
	Consolidated loss before income taxes		$	(2,674	)	$	(1,815	)
	* Includes stock compensation expense of $310 and $208 for the three month periods ended March 31, 2014 and 2015, respectively.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	NOTE 11—SUBSEQUENT EVENTS
	Repayment of GridSense loan
	The Company’s GridSense subsidiary is a party to a Loan and Security Agreement with Square 1 Bank (the “Bank”) dated as of November 2, 2012, as amended from time to time (the “Loan Agreement”) and a related Financing Agreement (the “Financing Agreement”). The obligations of GridSense to the Bank under the Loan Agreement are guaranteed by the Company.
	As previously disclosed in the Form 8-K filed on April 13, 2015, the Company received notice stating that the Company had failed to maintain compliance with covenants thereby creating an event of default under the Loan Agreement and under the Financing Agreement and declaring all obligations of GridSense owing under the Loan Agreement and the Financing Agreement to be immediately due and payable. As of the date of the notice, GridSense owed approximately $1,480 and $158 under the Loan Agreement and the Financing Agreement, respectively.
	Effective as of April 30, 2015, GridSense and the Bank entered into an amendment to the Loan Agreement pursuant to which (i) the Bank waived events of default under the Loan Agreement and Financing Agreement, (ii) GridSense paid $500 to the Bank in reduction of its obligations under the Loan Agreement, (iii) the Company deposited $250 on May 4, 2015 into a restricted account (the “Restricted Account”) at the Bank to secure the Company’s guaranty of GridSense’s obligations under the Loan Agreement and agreed to make additional deposits into the Restricted Account of $250 by May 14, 2015 (see below) and $250 by July 31, 2015, (iv) GridSense agreed to the repayment, commencing September 1, 2015, of an aggregate of $250 of advances under the Loan Agreement in equal monthly installments through May 1, 2016, and (v) the Company is required to have an unrestricted cash balance equal to no less than the amount of all obligations of GridSense to the Bank which are not secured by the Restricted Account. The Company is currently in compliance with this requirement.
	With respect to the deposit noted above that was due by May 14, 2015, the Bank subsequently agreed to allow the Company to deposit by such date $50 of the $250 that was due, with the remaining $200 of that tranche being deposited by May 31, 2015.  The Company made the $50 deposit on May 13, 2015.

Discontinued_Operations_Tables

Discontinued Operations (Tables)	3 Months Ended
	Mar. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Assets and Liabilities Related to Discontinued Operations	Assets and liabilities related to the discontinued operations of USSI are as follows:
		As of
		31-Dec-14			31-Mar-15
	Cash and cash equivalents	$	52		$	87
	Other current assets		91			54
	Total assets	$	143		$	141
	Short-term bank credit	$	1,460		$	1,460
	Accounts payable		1,006			1,001
	Accrued payroll, payroll taxes and social benefits		346			90
	Other current liabilities		1,881			1,821
	Total liabilities	$	4,693		$	4,372
Schedule of Financial Information	Summarized financial information for USSI’s operations for the three months ended March 31, 2014 and 2015 are presented below:
		Three months ended
		March 31,
		2014			2015
	Revenues	$	—		$	—
	Gross profit	$	(188	)	$	(90	)
	Net loss	$	(1,956	)	$	(1,152	)
	Net loss attributable to non-controlling interests		246			145
	Net loss attributable to Acorn Energy Inc.	$	(1,710	)	$	(1,007	)

Inventory_Net_Tables

Inventory, Net (Tables)	3 Months Ended
	Mar. 31, 2015
Inventory Disclosure [Abstract]
Schedule of Inventory	The composition of inventory is as follows:
		As of		As of
		31-Dec-14		31-Mar-15
	Raw materials	$	682	$	660
	Work-in-process		275		406
	Finished goods		417		264
		$	1,374	$	1,330

Goodwill_and_Intangible_Assets1

Goodwill and Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Carrying Amounts of Goodwill by Segment	The changes in the carrying amounts of goodwill by segment from December 31, 2014 to March 31, 2015 were as follows:
		Energy & Security Sonar Solutions segment			GridSense segment			Total
	Balance at December 31, 2014	$	518		$	513		$	1,031
	Translation adjustment		(12	)		—			(12	)
	Balance at March 31, 2015	$	506		$	513		$	1,019
Changes in Carrying Amounts and Accumulated Amortization of Intangible Assets	The changes in the carrying amounts and accumulated amortization of intangible assets from December 31, 2014 to March 31, 2015 were as follows:
		Cost			Accumulated amortization			Total
	Balance as of December 31, 2014	$	2,175		$	(964	)	$	1,211
	Amortization		—			(47	)		(47	)
	Cumulative translation adjustment		(74	)		37			(37	)
	Balance as of March 31, 2015	$	2,101		$	(974	)	$	1,127

Equity_Tables

Equity (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Summary of Stock Option Activity	A summary of stock option activity for the three months ended March 31, 2015 is as follows:
		Number			Weighted		Weighted Average Remaining Contractual Life		Aggregate Intrinsic Value
		of Options			Average
		(in shares)			Exercise
					Price Per Share
	Outstanding at December 31, 2014		1,812,428		$	4.51
	Granted		662,654		$	0.77
	Exercised		—			—
	Forfeited or expired		(86,830	)	$	3.12
	Outstanding at March 31, 2015		2,388,252		$	3.52		5.8 years	$	—
	Exercisable at March 31, 2015		1,198,570		$	5.28		3.8 years	$	—
Schedule of Fair Value Assumptions Estimated Using Black-Scholes Pricing Model	Black-Scholes option-pricing model with the following weighted average assumptions:
	Risk-free interest rate		2.1	%
	Expected term of options		8.7 years
	Expected annual volatility		63	%
	Expected dividend yield		—	%
Summary of Warrant Activity	The Company previously issued warrants at exercise prices equal to or greater than market value of the Company’s common stock at the date of issuance. A summary of warrant activity follows:
		Number			Weighted Average Exercise Price Per Share		Weighted Average Remaining Contractual Life
		of Warrants
		(in shares)
	Outstanding at December 31, 2014		2,642,423		$	1.5
	Granted		—
	Exercised		—			—
	Forfeited or expired		—			—
	Outstanding at March 31, 2015		2,642,423		$	1.5		4.9 years

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Schedule of Fair Value Measurements	Financial items measured at fair value are classified in the table below in accordance with the hierarchy established in applicable accounting principles.
		As at March 31, 2015
		Level 1		Level 2		Level 3			Total
	Restricted deposits – current and non-current	$	1,113	$	—	$	—		$	1,113
	Derivative assets (liabilities)		2		—		(78	)		(76	)
	Total	$	1,115	$	—	$	(78	)	$	1,037
		As at December 31, 2014
		Level 1		Level 2		Level 3			Total
	Restricted deposits – current and non-current	$	1,117	$	—	$	—		$	1,117
	Derivative assets (liabilities)		5		—		(50	)		(45	)
	Total	$	1,122	$	—	$	(50	)	$	1,072

Segment_Reporting_Tables

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Summary of Segmented Data		Energy& Security Sonar Solutions			GridSense			M2M			Other			Total
	Three months ended March 31, 2015
	Revenues from external customers	$	2,660		$	908		$	553		$	497		$	4,618
	Intersegment revenues		—			—			—			—			—
	Segment gross profit		605			277			340			297			1,519
	Depreciation and amortization		45			57			18			11			131
	Segment net income (loss) before income taxes		(294	)		(325	)		(278	)		105			(792	)
	Three months ended March 31, 2014
	Revenues from external customers	$	2,515		$	963		$	508		$	468		$	4,454
	Intersegment revenues		—			—			—			—			—
	Segment gross profit (loss)		686			185			312			247			1,430
	Depreciation and amortization		71			65			17			14			167
	Segment net loss before income taxes		(208	)		(973	)		(403	)		(21	)		(1,605	)
Reconciliation of Segment Data to Consolidated Statement of Operations	Reconciliation of Segment Income (Loss) to Consolidated Net Loss Before Income Taxes
		Three months ended
		March 31,
		2014			2015
	Total net loss before income taxes for reportable segments	$	(1,584	)	$	(897	)
	Other operational segment net income (loss) before income taxes		(21	)		105
	Total segment net loss before income taxes		(1,605	)		(792	)
	Unallocated cost of corporate headquarters*		(1,043	)		(1,033	)
	Unallocated benefit (cost) of DSIT headquarters		(26	)		10
	Consolidated loss before income taxes	$	(2,674	)	$	(1,815	)
	* Includes stock compensation expense of $310 and $208 for the three month periods ended March 31, 2014 and 2015, respectively.

Liquidity_Details_Narrative

Liquidity (Details Narrative) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Cash current	$2,099	$4,821
DSIT Solutions, Ltd. [Member] | Maximum [Member]
Cash current	$5,000

Discontinued_Operations_Detail

Discontinued Operations (Details Narrative) (U.S. Seismic Systems, Inc [Member], USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
U.S. Seismic Systems, Inc [Member]
Debt due to bank	($1,460)
Debt interest rate	11.50%

Discontinued_Operations_Schedu

Discontinued Operations - Schedule of Assets and Liabilities Related to Discontinued Operations (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Cash and cash equivalents	$2,099	$4,821
Other current assets	1,877	1,813
Total assets	26,899	29,543
Accounts payable	2,511	2,187
Other current liabilities	3,518	3,028
USSI [Member] | Discontinued Operations [Member]
Cash and cash equivalents	87	52
Other current assets	54	91
Total assets	141	143
Short-term bank credit	1,460	1,460
Accounts payable	1,001	1,006
Accrued payroll, payroll taxes and social benefits	90	346
Other current liabilities	1,821	1,881
Total liabilities	$4,372	$4,693

Discontinued_Operations_Schedu1

Discontinued Operations - Schedule of Financial Information (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Revenues	$4,618	$4,454
Gross profit	1,519	1,430
Net loss	-2,934	-4,575
Net loss attributable to Acorn Energy Inc.	-2,769	-4,304
U.S. Seismic Systems, Inc [Member] | Discontinued Operations [Member]
Revenues
Gross profit	-90	-188
Net loss	-1,152	-1,956
Net loss attributable to non-controlling interests	145	246
Net loss attributable to Acorn Energy Inc.	($1,007)	($1,710)

Restructing_and_Related_Charge

Restructing and Related Charges (Details Narrative) (USD $)	12 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Mar. 31, 2015	Dec. 31, 2013
GridSense [Member]
Restructuring Cost and Reserve [Line Items]
Severance costs	$38
Restructuring charges payable		38
OmniMetrix [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges payable		237	248
Payment of lease cost		11
Expected to be paid restructuring cost date		31-Dec-19
Restructuring charges included in other current liabilities		-44
Restructuring charges included in other liabilities		($193)

Inventory_Net_Details_Narrativ

Inventory, Net (Details Narrative) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Inventory valuation reserves	$302	$319

Inventory_Net_Schedule_of_Inve

Inventory, Net - Schedule of Inventory (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Inventory Disclosure [Abstract]
Raw materials	$660	$682
Work-in-process	406	275
Finished goods	264	417
Inventory, net	$1,330	$1,374

Goodwill_and_Intangible_Assets2

Goodwill and Intangible Assets (Details Narrative) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted average estimated useful lives in years	11 years 1 month 6 days
Amortization Expense	$47	$70
Amortization expense of intangible assets, 2016	185
Amortization expense of intangible assets, 2017	185
Amortization expense of intangible assets, 2018	185
Amortization expense of intangible assets, 2019	185
Amortization expense of intangible assets, 2020	$185

Goodwill_and_Intangible_Assets3

Goodwill and Intangible Assets - Changes in Carrying Amounts of Goodwill by Segment (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Goodwill, Beginning balance	$1,031
Translation Adjustments	-12
Goodwill, Ending balance	1,019
Energy & Security Sonar Solutions [Member]
Goodwill, Beginning balance	518
Translation Adjustments	-12
Goodwill, Ending balance	506
GridSense [Member]
Goodwill, Beginning balance	513
Translation Adjustments
Goodwill, Ending balance	$513

Goodwill_and_Intagible_Assets_

Goodwill and Intagible Assets - Changes in Carrying Amounts and Accumulated Amortization of Intangible Assets (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Intangible assets, Beginning balance	$1,211
Amortization	-47
Cumulative translation adjustment	-37
Intangible assets, Ending balance	1,127
Energy & Security Sonar Solutions [Member] | Accumulated Amortization [Member]
Intangible assets, Beginning balance	-964
Amortization	-47
Cumulative translation adjustment	37
Intangible assets, Ending balance	-974
Energy & Security Sonar Solutions [Member] | Cost [Member]
Intangible assets, Beginning balance	2,175
Amortization
Cumulative translation adjustment	-74
Intangible assets, Ending balance	$2,101

Equity_Details_Narrative

Equity (Details Narrative) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Fair value of option granted per share price	$0.52
Stock based compensation expense	$208	$310
USSI Stock Option Plan [Member] | Selling General and Administrative Expenses [Member]
Stock based compensation expense	$6	$32

Equity_Summary_of_Stock_Option

Equity - Summary of Stock Option Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Number of Options, Outstanding at beginning balance	1,812,428
Number of Options, Granted	662,654
Number of Options, Exercised
Number of Options, Forfeited or expired	-86,830
Number of Options, Outstanding at end balance	2,388,252
Number of Options, Exercisable at end of period	1,198,570
Weighted Average Exercise Price, Outstanding at beginning	$4.51
Weighted Average Exercise Price, Granted	$0.77
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited or expired	$3.12
Weighted Average Exercise Price, Outstanding at end	$3.52
Weighted Average Exercise Price, Exercisable at end of Period	$5.28
Weighted Average Remaining Contractual Terms, Outstanding	5 years 9 months 18 days
Weighted Average Remaining Contractual Terms, Exercisable	3 years 9 months 18 days

Equity_Schedule_of_Fair_Value_

Equity - Schedule of Fair Value Assumptions Estimated Using Black-Scholes Pricing Model (Details)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Risk-free interest rate	2.10%
Expected term of options, in years	8 years 8 months 12 days
Expected annual volatility	63.00%
Expected dividend yield

Equity_Summary_of_Warrant_Acti

Equity - Summary of Warrant Activity (Details) (USD $)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Number of shares underlying warrants, Outstanding at beginning	2,642,423
Number of shares underlying warrants, Granted
Number of shares underlying warrants, Exercised
Number of shares underlying warrants, Forfeited Or Expired
Number of shares underlying warrants, Outstanding and exercisable at end	2,642,423
Weighted Average Exercise Price, Outstanding at beginning	$1.50
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited Or Expired
Weighted Average Exercise Price, Outstanding and exercisable at end	$1.50
Weighted Average Remaining Contractual Life, Outstanding	4 years 10 months 24 days

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Fair Value Measurements (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted deposits - current and non-current	$1,113	$1,117
Derivative assets (liabilities)	-76	-45
Total	1,037	1,072
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted deposits - current and non-current	1,113	1,117
Derivative assets (liabilities)	2	5
Total	1,115	1,122
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted deposits - current and non-current
Derivative assets (liabilities)
Total
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted deposits - current and non-current
Derivative assets (liabilities)	-78	-50
Total	($78)	($50)

Segment_Reporting_Summary_of_S

Segment Reporting - Summary of Segmented Data (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting Information [Line Items]
Revenue from external customers	$4,618	$4,454
Intersegment revenues
Segment gross profit	1,519	1,430
Depreciation and amortization	131	167
Segment net income (loss) before income taxes	-792	-1,605
Energy & Security Sonar Solutions [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	2,660	2,515
Intersegment revenues
Segment gross profit	605	686
Depreciation and amortization	45	71
Segment net income (loss) before income taxes	-294	-208
GridSense [Member]
Segment Reporting Information [Line Items]
Revenue from external customers			908	963
Intersegment revenues
Segment gross profit			277	185
Depreciation and amortization			57	65
Segment net income (loss) before income taxes			-325	-973
M2M [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	553	508
Intersegment revenues
Segment gross profit	340	312
Depreciation and amortization	18	17
Segment net income (loss) before income taxes	-278	-403
Other [Member]
Segment Reporting Information [Line Items]
Revenue from external customers	497	468
Intersegment revenues
Segment gross profit	297	247
Depreciation and amortization	11	14
Segment net income (loss) before income taxes	$105	($21)

Segment_Reporting_Reconciliati

Segment Reporting - Reconciliation of Segment Data to Consolidated Statement of Operations (Details) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015		Mar. 31, 2014
Segment Reporting [Abstract]
Total net loss before income taxes for reportable segments	($897)		($1,584)
Other operational segment net income (loss) before income taxes	105		-21
Total segment net loss before income taxes	-792		-1,605
Unallocated cost of corporate headquarters*	-1,033	[1]	-1,043	[1]
Unallocated benefit (cost) of DSIT headquarters	10		-26
Consolidated loss before income taxes	($1,815)		($2,674)
[1]	Includes stock compensation expense of $310 and $208 for the three month periods ended March 31, 2014 and 2015, respectively.

Segment_Reporting_Reconciliati1

Segment Reporting - Reconciliation of Segment Data to Consolidated Statement of Operations (Details) (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting [Abstract]
Stock compensation expense	$208	$310

Subsequent_Events_Details_Narr

Subsequent Events (Details Narrative) (Subsequent Event [Member], USD $)	0 Months Ended
In Thousands, unless otherwise specified	Sep. 01, 2015	Apr. 30, 2015	14-May-15	13-May-15	Jul. 31, 2015	4-May-15	Apr. 13, 2015
Company deposit to restricted account				$50
Subsequent agreement by the Bank to change May 14, 2015 require deposit to restricted account			50
May 31, 2015 [Member]
Subsequent agreement by the Bank to change May 14, 2015 require deposit to restricted account				200
GridSense [Member]
Repayment of debt		500
Schedule of Company deposit to restricted account			250		250	250
Company deposit to restricted account						250
Remaining debt to be repaid in equal monthly installments	250
Loan Agreement [Member]
Value owed by GridSense							1,480
Financing Agreement [Member]
Value owed by GridSense							$158