Short-term and Other Investments	9 Months Ended
Sep. 30, 2021
Short-term and Other Investments
Short-term and Other Investments	3. Short-term and Other Investments Short-term investments As of September 30, 2021 and December 31, 2020, the amortized cost basis of our short-term investments was $nil and $400, respectively, which approximated fair value. Short-term investments at December 31, 2020 were comprised of U.S. government treasury securities, which had maturity dates on the date of purchase greater than 90 days but less than one year. Investments with maturity dates of 90 days or less were included in cash and cash equivalents. Other investments The Company’s investment in 1,333,334 common shares of Nusantara Resources Limited (“Nusantara” and “Nusantara Shares”) was recorded at fair value in the Unaudited Condensed Consolidated Balance Sheet at September 30, 2021 and December 31, 2020. Vista also held common shares of Midas Gold Corp. (“Midas Gold Shares”) during a portion of 2020; all Midas Gold Shares were sold prior to 2021. The fair value of other investments was $334 and $293 at September 30, 2021 and December 31, 2020, respectively. Changes in fair value of the Nusantara Shares and Midas Gold Shares, representing unrealized gains (losses), were recorded in the Unaudited Condensed Consolidated Statements of Income/(Loss) in the period in which the changes occurred. No listed securities in other investments were sold during the three and nine months ended September 30, 2021. During the three months ended September 30, 2020, the Company sold its remaining 4,667,615 Midas Gold Shares for net proceeds of $4,835, at a gain of $2,454 based on the most recent measurement period of June 30, 2020. During the nine months ended September 30, 2020, the Company sold 6,882,115 Midas Gold Shares for net proceeds of $5,788, at a gain of $2,574 based on the most recent measurement periods of June 30, 2020, March 31, 2020 and December 31, 2019. On September 22, 2021, the shareholders of Nusantara approved a scheme of arrangement whereby PT Indika Mineral Investindo offered to acquire all issued shares of Nusantara for A$0.35 per share. The transaction closed on October 6, 2021, resulting in Vista receiving $339 upon tendering its Nusantara Shares.

Short-term and Other Investments

9 Months Ended

Sep. 30, 2021

3. Short-term and Other Investments

Short-term investments

As of September 30, 2021 and December 31, 2020, the amortized cost basis of our short-term investments was $nil and $400, respectively, which approximated fair value. Short-term investments at December 31, 2020 were comprised of U.S. government treasury securities, which had maturity dates on the date of purchase greater than 90 days but less than one year. Investments with maturity dates of 90 days or less were included in cash and cash equivalents.

Other investments

The Company’s investment in 1,333,334 common shares of Nusantara Resources Limited (“Nusantara” and “Nusantara Shares”) was recorded at fair value in the Unaudited Condensed Consolidated Balance Sheet at September 30, 2021 and December 31, 2020. Vista also held common shares of Midas Gold Corp. (“Midas Gold Shares”) during a portion of 2020; all Midas Gold Shares were sold prior to 2021. The fair value of other investments was $334 and $293 at September 30, 2021 and December 31, 2020, respectively.

Changes in fair value of the Nusantara Shares and Midas Gold Shares, representing unrealized gains (losses), were recorded in the Unaudited Condensed Consolidated Statements of Income/(Loss) in the period in which the changes occurred. No listed securities in other investments were sold during the three and nine months ended September 30, 2021. During the three months ended September 30, 2020, the Company sold its remaining 4,667,615 Midas Gold Shares for net proceeds

of $4,835, at a gain of $2,454 based on the most recent measurement period of June 30, 2020. During the nine months ended September 30, 2020, the Company sold 6,882,115 Midas Gold Shares for net proceeds of $5,788, at a gain of $2,574 based on the most recent measurement periods of June 30, 2020, March 31, 2020 and December 31, 2019.

On September 22, 2021, the shareholders of Nusantara approved a scheme of arrangement whereby PT Indika Mineral Investindo offered to acquire all issued shares of Nusantara for A$0.35 per share. The transaction closed on October 6, 2021, resulting in Vista receiving $339 upon tendering its Nusantara Shares.