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EQUITY | 9 Months Ended
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Sep. 30, 2014
Equity [Abstract] |
Stockholders' Equity Note Disclosure | EQUITY
(a) | Acorn Stock Options
A summary of stock option activity for the nine months ended September 30, 2014 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, 2013 |  | 1,401,658 |  |  | $ | 5.49 |  |  |  |  |
Granted |  | 469,303 |  |  | $ | 2.49 |  |  |  |  |
Exercised |  | (33,938 | ) |  | $ | 2.51 |  |  |  |  |
Forfeited or expired |  | (146,062 | ) |  | $ | 3.77 |  |  |  |  |
Outstanding at September 30, 2014 |  | 1,690,961 |  |  | $ | 4.87 |  |  | 3.7 years |  | $ | — |
Exercisable at September 30, 2014 |  | 1,150,577 |  |  | $ | 5.49 |  |  | 3.7 years |  | $ | — |
During 2014, 33,938 options were exercised and 76,062 options were forfeited in connection with the “net exercise” of 110,000 options. In a net exercise of an option, the Company does not require a payment of the exercise price of the option from the optionee, but reduces the number of shares of common stock issued upon the exercise of the option by the smallest number of whole shares that has an aggregate fair market value equal to or in excess of the aggregate exercise price for the option shares covered by the option exercised. The 110,000 options which were exercised under this method had a weighted average exercise price exercise price of $2.51. The fair value of the options granted ($1.60 during the nine months ended September 30, 2014) was estimated on the grant dates using the Black-Scholes option-pricing model with the following weighted average assumptions:
Risk-free interest rate |  | 2.4 | %
Expected term of options |  | 7.2 years |
Expected annual volatility |  | 63 | %
Expected dividend yield |  | — | %
(b) | Stock-based Compensation Expense
Stock-based compensation expense included in the Company’s Condensed Statements of Operations for three and nine month periods ended September 30, 2013 and 2014 was as follows:
|  | Nine months ended September 30, |  | Three months ended September 30,
|  | 2013 |  | 2014 |  | 2013 |  | 2014
Cost of sales |  | $ | 44 |  |  | $ | 2 |  |  | $ | 44 |  |  | $ | 2 |
Research and development expenses, net of credits |  | 31 |  |  | 59 |  |  | 10 |  |  | 33 |
Selling, general and administrative expenses |  | 907 |  |  | 675 |  |  | 329 |  |  | 81 |
Total stock-based compensation expense |  | $ | 982 |  |  | $ | 736 |  |  | $ | 383 |  |  | $ | 116 |
(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 of Warrants (in shares) |  | Weighted Average Exercise Price Per Share |  | Weighted Average Remaining Contractual Life
Outstanding at December 31, 2013 |  | 285,281 |  |  | $ | 3.18 |  |  |
Granted |  | — |  |  |  |  |
Exercised |  | — |  |  | — |  |  |
Forfeited or expired |  | — |  |  | — |  |  |
Outstanding at September 30, 2014 |  | 285,281 |  |  | $ | 3.18 |  |  | 3.8 years

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d),(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB TOPIC 4.C) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29-31) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Preferred Stock -URI http://asc.fasb.org/extlink&oid=6521494 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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