XML 49 R22.htm IDEA: XBRL DOCUMENT
v2.4.1.9

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 of Options (in shares) |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life |  |  | Aggregate Intrinsic Value |
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 of Warrants (in shares) |  |  | Weighted Average Exercise Price Per Share |  |  | Weighted Average Remaining Contractual Life |
Outstanding at December 31, 2014 |  |  | 2,642,423 |  |  | $ | 1.50 |  |  |  |  |
Granted |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  |  |
Outstanding at March 31, 2015 |  |  | 2,642,423 |  |  | $ | 1.50 |  |  |  | 4.9 years |

X
- Definition Summary of warrant activity [Table Text Block] + References No definition available. + Details
Name: | ACFN_SummaryOfWarrantActivityTableTextBlock
Namespace Prefix: | ACFN_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration