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Equity
 3 Months Ended
Mar. 31, 2013
Equity
(8) Equity

Common stock

During the three months ended March 31, 2013 and March 31, 2012, the Company issued 260,000 and 554,259 shares, respectively, as a result of the exercise of stock options, resulting in gross and net proceeds of $0.4 million and gross and net proceeds of $0.8 million, respectively. In addition, during the three months ended March 31, 2013 and March 31, 2012, the Company issued 70,000 and 40,000 shares, respectively, as a result of the exercise of warrants, resulting in gross and net proceeds of $0.1 million and gross and net proceeds of $0.1 million, respectively.

In January 2013, the Company granted 434,875 restricted stock units, or RSUs, to several employees under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest upon the achievement of certain operational milestones and expire on August 3, 2015 if none of the milestones are achieved by such date. The RSUs will become fully vested upon a change of control of the Company. Upon vesting of each RSU, the participant shall be entitled to a payment equal to the fair market value of one share of Amarin common stock. The payment shall be paid to the participant in cash, or at the sole discretion of the Compensation Committee in shares or a combination of cash or shares. The fair value of the RSUs was determined on the date of grant, and compensation expense related to the RSUs is recognized once the related milestone is deemed probable. The Company recorded no expense during the period ended March 31, 2013 related to the vesting of these RSUs.

In February 2012, the Company granted 584,400 RSUs to several employees under the Amarin Corporation plc 2011 Stock Incentive Plan. These RSUs vest upon the achievement of certain regulatory and time-based milestones and expire on February 1, 2015 if none of the milestones are achieved by such date. The RSUs will become fully vested upon a change of control of the Company. Upon vesting of each RSU, the participant shall be entitled to a payment equal to the fair market value of one share of Amarin common stock. The payment shall be paid to the participant in cash, or at the sole discretion of the Compensation Committee in shares or a combination of cash or shares. The fair value of the RSUs was determined on the date of grant, and compensation expense related to the RSUs is recognized once the related milestone is deemed probable. During the periods ended March 31, 2013 and March 31, 2012, the Company recorded expense of $0.1million and $0.4 million, respectively, related to the vesting of these RSUs.