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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2012
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders’ Equity Preferred Stock
|  |  |  |  | Outstanding as of December 31, |
| Authorized |  | Issued |  | 2012 |  | 2011
Series A Preferred Stock, par $0.001 | 1,000 |  |  | 817 |  |  | — |  |  | — |
Series B Preferred Stock, par $0.001 | 1,000 |  |  | 750 |  |  | — |  |  | — |
Series C Preferred Stock, par $0.001 | 1,091 |  |  | 1,091 |  |  | 26 |  |  | 26 |
Series D Preferred Stock, par $0.001 | 1,966,292 |  |  | 1,966,292 |  |  | — |  |  | — |
There have been no changes in the number of outstanding shares of our preferred stock for the years ended December 31, 2012, 2011 or 2010. The shares of the Company’s outstanding Series C Preferred Stock have the following pertinent rights and privileges, as set forth in the Company’s Amended and Restated Certificate of Incorporation and its Certificates of Designations, Rights and Preferences related to the various series of preferred stock. Rights on Liquidation In the event of any voluntary or involuntary liquidation, dissolution or winding up of the Company (a “liquidation event”), before any distribution of assets of the Company shall be made to or set apart for the holders of common stock, the holders of Series C Preferred Stock, pari passu, are entitled to receive payment of such assets of the Company in an amount equal to $10,000 per share of such series of preferred stock, plus any accumulated and unpaid dividends thereon (whether or not earned or declared). If the assets of the Company available for distribution to stockholders exceed the aggregate amount of the liquidation preferences payable with respect to all shares of each series of preferred stock then outstanding, then, after the payment of such preferences is made or irrevocably set aside, the holders of the Company’s common stock are entitled to receive a pro rata portion of such assets based on the aggregate number of shares of common stock held by each such holder. The holders of the Company’s outstanding preferred stock shall participate in such a distribution on a pro-rata basis, computed based on the number of shares of common stock which would be held by such preferred holders if immediately prior to the liquidation event all of the outstanding shares of the preferred stock had been converted into shares of common stock at the then current conversion value applicable to each series. A Change of Control of the Company (as defined in the Certificates of Designations, Rights and Preferences) is not a liquidation event triggering the preferences described above, and is instead addressed by separate terms in the Series C Certificates of Designations, Rights, and Preferences. Although the liquidation preferences are in excess of the par value of $0.001 per share of the Company’s preferred stock, these preferences are equal to or less than the stated value of such shares based on their original purchase price. Voting Rights The holders of all series of the Company’s preferred stock outstanding have full voting rights and powers equal to the voting rights and powers of holders of the Company’s common stock and are entitled to notice of any stockholders’ meeting in accordance with the Company’s Bylaws. Holders of the Company’s preferred stock are entitled to vote on any matter upon which holders of the Company’s common stock have the right to vote, including, without limitation, the right to vote for the election of directors together with the holders of common stock as one class. Conversion Rights The Series C Preferred Stock each provide the holder of such shares an optional conversion right and provide a mandatory conversion upon certain triggering events. Right to Convert The holder of any share or shares of Series C Preferred Stock has the right at any time, at such holder’s option, to convert all or any lesser portion of such holder’s shares of the Preferred Stock into such number of fully paid and non-assessable shares of Common Stock as is determined by dividing (i) the aggregate Liquidation Preference applicable to the particular series of preferred shares, plus accrued and unpaid dividends thereon by (ii) the applicable Conversion Value (as defined in the relevant series’ Certificate of Designations, Rights and Preferences) then in effect for such series of preferred shares. The Company is not obligated to issue any fractional shares or scrip representing fractional shares upon such conversion and instead shall pay the holder an amount in cash equal to such fraction multiplied by the current market price per share of the Company’s common stock. Mandatory Conversion The Company has the option upon thirty (30) days prior written notice, to convert all of the outstanding shares of the Series C Preferred Stock into such number of fully paid and non-assessable shares of common stock as is determined by dividing (i) the aggregate Liquidation Preference of the shares of the relevant series of preferred stock to be converted plus accrued and unpaid dividends thereon by (ii) the applicable Conversion Value (as defined in the relevant series’ Certificate of Designations, Rights and Preferences) then in effect, if at any time after twelve months following the Original Issue Date of each such series of preferred stock all of the following triggering events occur: (i) The registration statement covering all of the shares of common stock into which the particular series of preferred stock is convertible is effective (or all of the shares of common stock into which the preferred stock is convertible may be sold without restriction pursuant to Rule 144 under the Securities Act of 1933, as amended); (ii) the Daily Market Price (as defined in the applicable Certificates of Designations, Rights and Preferences) of the common stock crosses a specified pricing threshold for twenty of the thirty consecutive trading days prior to the date the Company provides notice of conversion to the holders; and (iii) the average daily trading volume (subject to adjustment for stock dividends, subdivisions and combinations) of the common stock for at least twenty of the thirty consecutive trading days prior to the date the Company provides notice of conversion to the holders exceeds 25,000 shares. As of December 31, 2012, our outstanding shares of the Series C Preferred Stock were convertible into 38,233 shares of our common stock at a conversion price of $6.80 per share, and the applicable Daily Market Price of the common stock for triggering mandatory conversion equaled $18.00 per share. Common Stock In June 2012, the Company entered into a sales agreement (the “Sales Agreement”) with an outside placement agent (the “Placement Agent”) to sell shares of its common stock with aggregate gross proceeds of up to $25.0 million from time to time, through an “at-the-market” equity offering program under which the Placement Agent will act as sales agent. Under the Sales Agreement, the Company will set the parameters for the sale of shares, including the number of shares to be issued, the time period during which sales are requested to be made, limitation on the number of shares that may be sold in any one trading day and any minimum price below which sales may not be made. The Sales Agreement provides that the Placement Agent will be entitled to compensation for its services in an amount equal to 3.0% of the gross proceeds from the sales of shares sold through the Placement Agent under the Sales Agreement. The Company has no obligation to sell any shares under the Sales Agreement, and may at any time suspend solicitation and offers under the Sales Agreement. During the year ended December 31, 2012, the Company sold a total of 9,344,611 shares of common stock under the Sales Agreement. The sales were made at a weighted average price of $0.59 per share with net proceeds to the Company of $5.3 million. In December 2011, the Company completed an underwritten public offering relating to the sale and issuance of 7,699,712 units to certain institutional investors, consisting of 7,699,712 shares of common stock and warrants to purchase an aggregate of up to 5,774,784 additional shares of common stock. These units, which were purchased for $0.5195 per unit, include the partial exercise of the underwriter's overallotment option of 962,465 additional units at the public offering price. The units consist of one share of common stock and 0.75 of a warrant to purchase one share of common stock. The warrants have a term of five years and an exercise price of $0.65 per share. The Company may call the warrants if the closing bid price of the common stock has been at least $1.30 over 20 trading days and certain other conditions are met. The Company received net proceeds from the transaction of approximately $3.7 million, after deducting the underwriter's discounts and other offering expenses payable by the Company. The Company valued the registered warrants issued in connection with the December 2011 financing as of the issuance date using the Black Scholes pricing model and recorded a current liability on the consolidated balance sheet. The warrants were subsequently revalued and the Company recorded the change in fair value of $115,000 and $58,000 to change in fair value of common stock warrants on the consolidated statement of operations for the years ended December 31, 2012 and 2011, respectively. As of December 31, 2012, none of these warrants had been exercised. In January 2011, the Company entered into investor purchase agreements with investors relating to the issuance and sale of (a) 21,130,400 shares of common stock, and (b) warrants to purchase a total of 10,565,200 shares of common stock with an exercise price of $1.40 per share, for an aggregate purchase price of approximately $24.3 million. The shares of common stock and warrants were sold in units, consisting of one share of common stock and a warrant to purchase 0.50 of a share of common stock, at a purchase price of $1.15 per unit. The Warrants have a five-year term from the date of issuance and are first exercisable commencing on the 180 th day after the date of issuance. The Company may call the warrants if the closing bid price of the common stock has been at least $2.80 over 20 trading days and certain other conditions are met. The Company received net proceeds from the transaction of approximately $23.0 million, after deducting the placement agent's fee and estimated offering expenses payable by the Company. The Company valued the registered warrants issued in connection with the January 2011 financing as of the issuance date using the Black Scholes pricing model and recorded a current liability on the consolidated balance sheet. The warrants were subsequently revalued and the Company recorded the change in fair value of $2.4 million and $8.6 million to change in fair value of common stock warrants on the consolidated statement of operations for the years ended December 31, 2012 and 2011, respectively. As of December 31, 2012, none of these warrants had been exercised. In August 2010, the Company entered into an At-The-Market Equity Distribution Agreement (the “ ATM Agreement”) with an outside placement agent (the “Placement Agent”), under which the Company may, from time to time, offer and sell its common stock having aggregate sales proceeds of up to $25.0 million through or to the Placement Agent, for resale. Sales of the Company’s common stock through the Placement Agent, if any, will be made by means of ordinary brokers’ transactions on the NYSE MKT or otherwise at market prices prevailing at the time of sale or as otherwise agreed upon by the Company and the Placement Agent. The Placement Agent will use commercially reasonable efforts to sell the Company’s common stock from time to time, based upon instructions from the Company. The Company will pay the Placement Agent a commission, or allow a discount, as the case may be, in each case equal to 3.0% of the gross sales proceeds of any common stock sold through the Placement Agent under the ATM Agreement. The Company has agreed to reimburse the Placement Agent for certain expenses incurred by them in connection with the transactions contemplated by the ATM Agreement, up to an aggregate of $30,000, plus up to an additional $5,000 per calendar quarter related to ongoing maintenance, due diligence expenses and other expenses associated therewith. During the years ended December 31, 2011 and 2010, the Company sold an aggregate total of 3,023,577 shares of common stock under the ATM Agreement. The sales were made at a weighted average price of $1.25 per share with net proceeds to the Company of $3.7 million, after deducting commissions and other fees. The Company accounts for registered common stock warrants issued in July 2009, January 2011 and December 2011 under the authoritative guidance on accounting for derivative financial instruments indexed to, and potentially settled in, a company’s own stock, on the understanding that in compliance with applicable securities laws, the registered warrants require the issuance of registered securities upon exercise and do not sufficiently preclude an implied right to net cash settlement. The Company classifies registered warrants on the consolidated balance sheet as a current liability which is revalued at each balance sheet date subsequent to the initial issuance. Determining the appropriate fair-value model and calculating the fair value of registered warrants requires considerable judgment, including estimating stock price volatility and expected warrant life. The Company develops its estimates based on historical data. A small change in the estimates used may have a relatively large change in the estimated valuation. The Company uses the Black-Scholes pricing model to value the registered warrants. Changes in the fair market value of the warrants are reflected in the consolidated statement of operations as “Change in fair value of common stock warrants.” Warrants The following table summarizes the warrants outstanding as of December 31, 2012 and 2011:
|  |  |  |  |  | As of December 31, 2012 |  | As of December 31, 2011
Issued in Connection With: |  | Exercise Price |  | Expiration Date |  | Number of Warrants |  | Common Stock Warrant Liability |  | Number of Warrants |  | Common Stock Warrant Liability
December 2011 financing |  | $ | 0.65 |  |  | December 6, 2016 |  | 5,774,784 |  |  | $ | 2,078,921 |  |  | 5,774,784 |  |  | $ | 1,963,427 |
January 2011 financing |  | $ | 1.40 |  |  | January 27, 2016 |  | 10,565,200 |  |  | 779,711 |  |  | 10,565,200 |  |  | 3,169,560 |
July 2009 financing |  | $ | 3.38 |  |  | July 1, 2014 |  | 333,333 |  |  | 1,267 |  |  | 333,333 |  |  | 43,332 |
Warrants assumed in June 2009 Merger |  | $0.05-$1.28 |  |  | March 24, 2013- April 28, 2016 |  | 4,920,527 |  |  | — |  |  | 4,920,527 |  |  | — |
August 2007 consulting services |  | $ | 3.00 |  |  | August 3, 2012 |  | — |  |  | — |  |  | 150,000 |  |  | — |
Total |  |  |  |  |  | 21,593,844 |  |  | $ | 2,859,899 |  |  | 21,743,844 |  |  | $ | 5,176,319 |
In August 2012, warrants expired to purchase 150,000 shares of our common stock issued in connection with consulting services received in August 2007. In October 2011, warrants expired to purchase 2,364,394 shares of our common stock issued in connection with our October 2006 registered offering with foreign investors. In December 2010, warrants expired to purchase 3,462,451 shares of our common stock issued in connection with our December 2005 private placement. In September 2010, warrants expired to purchase 150,000 shares of our common stock, which were issued in connection with a license agreement with the University of South Florida Research Foundation, Inc. (USF). Stock Options The Company has one active stock and cash-based incentive plan, the Amended and Restated 2007 Omnibus Incentive Plan (the “Incentive Plan”), pursuant to which the Company has granted stock options and restricted stock awards to executive officers, directors and employees. The Incentive Plan was adopted on March 31, 2007, approved by the stockholders on May 4, 2007, approved by the stockholders as amended on May 2, 2008, and approved by the stockholders as amended and restated on August 25, 2009 and May 14, 2010. On May 14, 2010 the stockholders approved to increase the aggregate number of shares available for grant under the Incentive Plan by 2,000,000 and to provide that the aggregate number of shares available for grant under the Incentive Plan will be increased on January 1 of each year beginning in 2011 by a number of shares equal to the lesser of (1) 2,055,331 or (2) such lesser number of shares as may be determined by the Board. At December 31, 2012, the Incentive Plan reserves 9,860,662 shares of common stock for issuance as or upon exercise of incentive awards granted and to be granted at future dates. At December 31, 2012, the Company had 1,875,287 shares of common stock available for future grant under the Incentive Plan, and 240,000 shares of vested restricted stock and options to purchase 7,430,162 shares of common stock outstanding under the Incentive Plan. The awards granted and available for future grant under the Incentive Plan generally vest over three years and have a maximum contractual term of ten years. The Incentive Plan terminates by its terms on March 31, 2017. The Incentive Plan supersedes all of the Company’s previous stock option plans, which include the Amended 2000 Stock Option Plan and the VGX Equity Compensation Plan, under which the Company had options to purchase 1,371,435 and 7,455,847 shares of common stock outstanding at December 31, 2012, respectively. The terms and conditions of the options outstanding under these plans remain unchanged. Total compensation cost for our stock plans recognized in the consolidated statement of operations for the years ended December 31, 2012, 2011 and 2010 was $1.2 million, $1.6 million, and $898,000, respectively, of which $555,000, $472,000 and $281,000 was included in research and development expenses and $638,000, $1.1 million and $617,000 was included in general and administrative expenses, respectively. At December 31, 2012 and 2011, there was $944,000 and $981,000 of total unrecognized compensation cost, respectively, related to unvested stock options, which is expected to be recognized over a weighted-average period of 1.9 years and 1.7 years, respectively. The fair value of options granted to non-employees at the measurement dates were estimated using the Black-Scholes pricing model. Total stock-based compensation for options granted to non-employees for the years ended December 31, 2012, 2011 and 2010 was $153,000, $33,000 and $277,000, respectively. As of December 31, 2012, 6,704,409 non-employee options remained outstanding. The following table summarizes total stock options outstanding at December 31, 2012:
|  | Options Outstanding |  | Options Exercisable
Exercise Price |  | Options Outstanding |  | Weighted-Average Remaining Contractual Life (in Years) |  | Weighted Average Exercise Price |  | Options Exercisable |  | Weighted-Average Exercise Price
$0.00 – $1.00 |  | 4,318,101 |  |  | 7.1 |  | $ | 0.51 |  |  | 2,264,657 |  |  | $ | 0.43 |
$1.01 – $2.00 |  | 10,542,570 |  |  | 5.1 |  | $ | 1.30 |  |  | 9,576,401 |  |  | $ | 1.32 |
$2.01 – $4.00 |  | 1,108,024 |  |  | 3.2 |  | $ | 3.01 |  |  | 1,108,024 |  |  | $ | 3.01 |
$4.01 – $6.00 |  | 238,749 |  |  | 1.2 |  | $ | 4.87 |  |  | 238,749 |  |  | $ | 4.87 |
$6.01 – $6.12 |  | 50,000 |  |  | 1.2 |  | $ | 6.12 |  |  | 50,000 |  |  | $ | 6.12 |
|  | 16,257,444 |  |  | 5.4 |  | $ | 1.28 |  |  | 13,237,831 |  |  | $ | 1.39 |
At December 31, 2012, the aggregate intrinsic value of options outstanding was $1.1 million, the aggregate intrinsic value of options exercisable was $901,000, and the weighted average remaining contractual term of options exercisable was 4.7 years. At December 31, 2011, the aggregate intrinsic value of options outstanding was $294,000, the aggregate intrinsic value of options exercisable was $294,000, and the weighted average remaining contractual term of options exercisable was 5.0 years. Stock option activity under our stock option plans was as follows:
| Number of Shares |  | Weighted-Average Exercise Price
Balance, December 31, 2009 | 13,142,039 |  |  | $ | 1.54 |
Granted | 442,500 |  |  | 1.12 |
Exercised | (297,462 | ) |  | 0.57 |
Cancelled | (637,109 | ) |  | 2.75 |
Balance, December 31, 2010 | 12,649,968 |  |  | 1.49 |
Granted | 2,068,750 |  |  | 1.10 |
Exercised | (68,309 | ) |  | 0.23 |
Cancelled | (347,606 | ) |  | 2.25 |
Balance, December 31, 2011 | 14,302,803 |  |  | 1.42 |
Granted | 2,733,750 |  |  | 0.58 |
Exercised | — |  |  | — |
Cancelled | (779,109 | ) |  | 1.55 |
Balance, December 31, 2012 | 16,257,444 |  |  | $ | 1.28 |
The weighted average exercise price was $1.83 for the 207,498 options which expired during the year ended December 31, 2012, $2.08 for the 100,000 options which expired during the year ended December 31, 2011 and $15.28 for the 4,250 options which expired during the year ended December 31, 2010. The weighted average grant date fair value per share was $0.47, $0.90 and $0.93 for options granted during the years ended December 31, 2012, 2011 and 2010, respectively. The Company received $0, $16,000 and $169,000 in proceeds from the exercise of stock options during the years ended December 31, 2012, 2011 and 2010, respectively. The aggregate intrinsic value of options exercised was $0, $65,000 and $193,000 during the years ended December 31, 2012, 2011 and 2010, respectively.

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- Definition The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 5: 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 6: 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 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=6959260&loc=d3e187143-122770 Reference 8: 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 9: 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 10: 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 11: 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 12: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 7, 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 14: 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 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph d -Article 4 Reference 16: 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 17: 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=6228006&loc=d3e74512-122707 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. 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