Income Taxes	9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract]
Income Taxes	9. Income Taxes As of December 31, 2010, our deferred tax assets were fully reserved with a related valuation allowance. On April 6, 2011, we completed the Combination with Midas Gold Inc. that was a tax-free reorganization for U.S. tax purposes. However, upon completion of the Combination, Vista US received Midas Gold Shares with an initial fair value of $78,872. The corresponding estimated deferred tax liability of $29,675 at the time of the Combination exceeded the valuation allowance of $6,086 for Vista US. Therefore, the valuation allowance against Vista US's deferred tax asset was released upon receipt of the Midas Gold Shares. At September 30, 2011, the deferred tax asset of $6,086 has been offset against the deferred tax liability of $39,632, representing the deferred tax liability for our unrealized gain on the Midas Gold Shares, and has been recorded in the Consolidated Balance Sheet. The tax calculation is based on an effective rate of 38.01% (US Federal – 35% and state – 3.01%). As of September 30, 2011, the Company has identified an uncertain tax position of $826 related to the utilization of certain net operating loss carry forwards that are expected to be taken on future income tax returns. This uncertain tax position increased the Company's effective income tax rate for the three and nine months ended September 30, 2011 to 40.04% and 38.82%, respectively.

Income Taxes

9 Months Ended

Sep. 30, 2011

9. Income Taxes

As of December 31, 2010, our deferred tax assets were fully reserved with a related valuation allowance. On April 6, 2011, we completed the Combination with Midas Gold Inc. that was a tax-free reorganization for U.S. tax purposes. However, upon completion of the Combination, Vista US received Midas Gold Shares with an initial fair value of $78,872. The corresponding estimated deferred tax liability of $29,675 at the time of the Combination exceeded the valuation allowance of $6,086 for Vista US. Therefore, the valuation allowance against Vista US's deferred tax asset was released upon receipt of the Midas Gold Shares. At September 30, 2011, the deferred tax asset of $6,086 has been offset against the deferred tax liability of $39,632, representing the deferred tax liability for our unrealized gain on the Midas Gold Shares, and has been recorded in the Consolidated Balance Sheet. The tax calculation is based on an effective rate of 38.01% (US Federal – 35% and state – 3.01%).

As of September 30, 2011, the Company has identified an uncertain tax position of $826 related to the utilization of certain net operating loss carry forwards that are expected to be taken on future income tax returns. This uncertain tax position increased the Company's effective income tax rate for the three and nine months ended September 30, 2011 to 40.04% and 38.82%, respectively.