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Equity | 3 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Equity | NOTE 9—EQUITY (a) Acorn Stock Options A summary of stock option activity for the three months ended March 31, 2016 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, 2015 |  |  | 2,364,918 |  |  | $ | 3.51 |  |  |  |  |  |  |  |  |
Granted |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |  |  |  |  |
Forfeited or expired |  |  | (66,666 | ) |  | $ | 3.70 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2016 |  |  | 2,298,252 |  |  | $ | 3.50 |  |  |  | 5.1 years |  |  | $ | — |
Exercisable at March 31, 2016 |  |  | 2,186,583 |  |  | $ | 3.58 |  |  |  | 5.0 years |  |  | $ | — |
In connection with the January 28, 2016 resignation of the Company’s then President and CEO (John A. Moore), all of Mr. Moore’s unvested options at that time became fully vested. (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, 2015 and 2016 was $208 and $220, respectively. In addition, $6 was recorded in the Company’s USSI subsidiary included in Discontinued Operations for the three month period ended March 31, 2015. See Note 3(b). (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, 2015 |  |  | 2,619,423 |  |  | $ | 1.48 |  |  |  |  |
Granted |  |  | 35,000 |  |  |  | 0.13 |  |  |  |  |
Exercised |  |  | — |  |  |  | — |  |  |  |  |
Forfeited or expired |  |  | — |  |  |  | — |  |  |  |  |
Outstanding at March 31, 2016 |  |  | 2,654,423 |  |  | $ | 1.46 |  |  |  | 3.9 years |
The fair value of the warrants granted ($0.08 per warrant during the three months ended March 31, 2016) was estimated on the grant dates using the Black-Scholes option-pricing model with the following weighted average assumptions:
Risk-free interest rate |  |  | 1.79% |
Expected term of warrants |  |  | 7.0 years |
Expected annual volatility |  |  | 78% |
Expected dividend yield |  |  | —% |
(d) Vested Share Rights – see Subsequent Events (Note 12)

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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 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 2: 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 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)) -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 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644 Reference 5: 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(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 6: 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(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 7: 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 8: 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(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: 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 10: 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 11: 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 12: 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 Reference 13: 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 14: 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 15: 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 16: 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 + Details
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