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Warrants and Derivative Liability | 12 Months Ended
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Dec. 31, 2011
Warrants and Derivative Liability | (7) Warrants and Derivative Liability The Company had 21,106,363 warrants to purchase common shares outstanding at December 31, 2011 at a weighted-average exercise price of $1.48, as summarized in the following table:
Issue Date |  | Amount |  |  | Exercise Price |  |  | Expiration Date |
4/27/07 |  |  | 17,500 |  |  |  | 17.90 |  |  |  | 1/17/14 |
6/1/07 |  |  | 55,737 |  |  |  | 7.20 |  |  |  | 5/31/12 |
12/5/07 |  |  | 516,300 |  |  |  | 1.17 |  |  |  | 12/3/12 |
7/31/09 |  |  | 138,888+ |  |  |  | 1.00 |  |  |  | 7/30/14 |
7/31/09 |  |  | 1,666,000 |  |  |  | 1.00 |  |  |  | 7/30/14 |
10/16/09 |  |  | 18,064,888 |  |  |  | 1.50 |  |  |  | 10/15/14 |
10/16/09 |  |  | 647,050 |  |  |  | 1.50 |  |  |  | 10/15/14 |
|  |  | 21,106,363 |  |  | $ | 1.48 |  |  |  |  |
October 2009 Warrants On October 16, 2009, The Company completed a $70.0 million private placement with both existing and new investors resulting in $62.3 million in net proceeds and an additional $3.6 million from bridge notes converted in conjunction with the private placement (see footnote 8—Debt). In consideration for the $62.3 million in net cash proceeds Amarin issued 66.4 million units, each unit consisting of (i) one ADS (representing one ordinary share) at purchase price of $1.00 and (ii) a warrant with a five year term to purchase 0.5 of an ADS at an exercise price of $1.50 per ADS. In consideration for the conversion of $3.6 million of convertible bridge notes, Amarin issued 4.0 million units, each unit consisting of (i) one ADS (representing one ordinary share) at a purchase price of $0.90 and (ii) a warrant with a five year term to purchase 0.5 of an ADS an exercise price of $1.50 per ADS. The total number of warrants issued in conjunction with the financing was 35.2 million. The warrants issued in connection with the October 2009 financing contained a pricing variability feature which provided for an increase to the exercise price if the exchange rate between the U.S. dollar and British pound adjusts such that the warrants could be exercised at a price less than the £0.5 par value of the common stock – that is, if the exchange rate exceeded U.S. $3.00 per £1.0 sterling. Due to the potential variable nature of the exercise price, the warrants are not considered to be indexed to the Company’s common stock. Accordingly, the warrants do not qualify for the exception to classify the warrants within equity and are classified as a derivative liability. The initial fair value of these warrants was determined to be approximately $47.1 million using the Black-Scholes option pricing model. The Company recorded the warrant issuances as a reduction to additional paid-in capital. In conjunction with the October 2009 financing, the Company issued an additional 0.9 million warrants to three former officers. The initial fair value of the warrant derivative liability associated with these warrants was determined to be $1.2 million using the Black-Scholes option pricing model. The Company recorded a warrant derivative liability of $1.2 million for these warrants and a corresponding charge to compensation expense of $1.2 million for the period ended December 31, 2009. The fair value of this warrant derivative liability is remeasured at each reporting period, with changes in fair value recognized in the statement of operations. The fair value of the warrants at December 31, 2009 was determined to be approximately $41.5 million using the Black-Scholes option pricing model and the Company recognized a gain of approximately $6.6 million for a change in fair value of warrant derivative liability and a reduction to compensation expense of $0.2 million for the period ended December 31, 2009. Although the warrants contain a pricing variability feature, the number of warrants issuable remains fixed. Therefore, the maximum number of common shares issuable as a result of the October 2009 private placement is 36.1 million. During the year ended December 31, 2010, approximately 5.3 million of these October 2009 warrants were exercised, resulting in gross proceeds to the Company of approximately $8.0 million. Upon exercise, the fair value of the warrants exercised is remeasured and reclassified from warrant liability to additional paid-in capital. The $22.3 million fair value of the exercised warrants was transferred from warrant liability to additional paid in capital with the change in the fair value on the exercise date recognized in the statement of operations. The fair value of the warrant liability at December 31, 2010 for the remaining warrants was determined to be approximately $230.1 million. The Company recognized a loss on change in fair value of derivative liability of $205.2 million and compensation expense of $5.7 million for the period ended December 31, 2010. During the year ended December 31, 2011, approximately 12.1 million of these October 2009 warrants were exercised, resulting in gross proceeds to the Company of approximately $18.1 million. Upon exercise, the fair value of the warrants exercised is remeasured and reclassified from warrant liability to additional paid-in capital. The $129.5 million fair value of the exercised warrants was transferred from warrant liability to additional paid in capital with the change in the fair value on the exercise date recognized in the statement of operations. The fair value of the warrant liability at December 31, 2011 for the remaining warrants was determined to be approximately $123.1 million. The Company recognized a loss on change in fair value of derivative liability of $22.7 million and compensation income of $0.1 million for the period ended December 31, 2011. June and July 2009 Warrants In conjunction with the $2.6 million private placement of 8% convertible bridge loans due August 2009 in June 2009 the Company issued 1,444,442 warrants with an exercise price of $1.00. In July 2009, the Company completed a second private placement of $3.0 million of 8% convertible bridge loans due September 30, 2009. In conjunction with the July loan (i) $0.1 million of the June 2009 bridge notes were repaid, (ii) the maturity date of the June 2009 bridge notes was extended to September 30, 2009, (iii) the Company cancelled and reissued 1,388,887 of the June 2009 warrants with an exercise price of $1.00 and (iv) the Company issued an additional 1,666,666 warrants with an exercise price of $1.00. The initial fair value of the warrants issued in conjunction with the June 2009 and July 2009 bridge loans was approximately $1.3 million and $1.5 million, respectively. Due to the lack of a fixed conversion feature, the warrants were classified as a derivative and the fair value of these warrants of $2.8 million was recorded in warrant derivative liability at the date of the transaction, with the remaining fair value of the proceeds received of $2.8 million recorded as loan payable. The difference between the loan payable of $2.8 million and the face value of the bridge notes of $5.6 million was recognized over the remaining term of the loan as interest expense of $2.8 million, and is included in the statement of operations for the period ended December 31, 2009. In conjunction with the $70.0 million October 2009 private placement, $3.6 million of the $5.5 million outstanding bridge loan notes were converted into 3,999,996 common shares and new warrants were issued to purchase 1,999,996 common shares at an exercise price of $1.50. On October 16, 2009, the date of the conversion, the fair value of the June and July 2009 warrant derivative liability was $4.3 million. The resulting increase in the fair value of the bridge loan warrants of $1.5 million was recognized as a loss on change in fair value of derivative liabilities during the period ended December 31, 2009. At October 2009, the number and value of the underlying shares became fixed and determinable, therefore, the warrants were no longer classified as derivative liability and were remeasured to fair value and reclassified from derivative liability to additional paid-in capital with the change in the fair value on the exercise date recognized in the statement of operations. December 2007 Warrants In conjunction with a registered direct offering in December 2007, the Company issued approximately 1.0 million warrants to purchase common stock at an initial exercise price of $4.80 per share, which was later adjusted to $1.17 based on a price protection provision in the warrant. Due to the pricing variability feature, the warrants were classified as derivative liabilities. The initial fair value of these warrants at December 31, 2007 was calculated to be approximately $2.1 million. The warrant liability was re-measured at each reporting date with subsequent changes in fair value recognized in the statement of operations. At December 31, 2008, the fair value of these warrants was $0.5 million and the Company recognized a gain on change in fair value of derivative liability of approximately $1.6 million for the period ended December 31, 2008, due to the decrease in the fair value of these warrants from December 31, 2007. At December 6, 2009, in accordance with the December 2007 purchase agreement, the pricing variability feature of these warrants expired and the number and value of the underlying shares became fixed. As such, the warrants were no longer considered a derivative liability and the fair value of the warrants at December 6, 2009 was determined to be $1.0 million. The resulting increase in the fair value of the warrants of $0.5 million was recognized as a loss on change in fair value of derivative liability for the period ended December 31, 2009, and the $1.0 million fair value of the warrants was reclassified from derivative liability to additional paid-in capital. Pre-December 2007 Warrants The Company issued several warrants in January 2006, April 2007, June 2007 and November 2007. These have been classified as equity instruments and have been included in the Company’s consolidated balance sheet within equity at December 31, 2011 and 2010.

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- Definition The entire disclosure for the entity's entire derivative instruments and hedging activities. Describes an entity's risk management strategies, derivatives in hedging activities and non-hedging derivative instruments, the assets, obligations, liabilities, revenues and expenses arising therefrom, and the amounts of and methodologies and assumptions used in determining the amounts of such items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959 Reference 3: 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.(n)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5618551-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5708773-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41638-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41641-113959 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6441202&loc=d3e80720-113993 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80784-113994 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579240-113959 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6935481&loc=d3e41635-113959 Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624181-113959 Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624258-113959 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959 Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 20: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -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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