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Capital Stock | 12 Months Ended
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Dec. 31, 2011
Capital Stock [Abstract] |
Capital Stock | 9. Capital Stock Common Shares issued and outstanding
|  | Number of shares issued |  |  | Common stock |
As of December 31. 2008 |  |  | 34,475,829 |  |  | $ | 300,657 |
Public offering (a) |  |  | 8,800,000 |  |  |  | 17,635 |
Over-allotment (a) |  |  | 1,320,000 |  |  |  | 2,734 |
Exercises of stock options, cash - Note 11 |  |  | 83,195 |  |  |  | 287 |
Issued during 2009 |  |  | 10,203,195 |  |  |  | 20,656 |
As of December 31, 2009 |  |  | 44,679,024 |  |  | $ | 321,313 |
Early extinguishment of convertible notes - Note 8 |  |  | 1,581,488 |  |  |  | 5,042 |
Interest payment on extinguished convertible notes - Note 8 |  |  | 321,196 |  |  |  | 604 |
Private placement October 2010, net (b) |  |  | 15,308,044 |  |  |  | 22,680 |
Exercises of stock options - Note 11 |  |  | 30,000 |  |  |  | 80 |
Issued during 2010 |  |  | 17,240,728 |  |  |  | 28,406 |
As of December 31, 2010 |  |  | 61,919,752 |  |  | $ | 349,719 |
Exercises of employee stock options, cash |  |  | 354,984 |  |  |  | 1,313 |
Exercises of restricted stock units, fair value - Note 11 |  |  | 140,905 |  |  |  | 392 |
Cash paid in lieu of capital stock issuances |  |  | - |  |  |  | (107 | )
April 20, 2011 equity financing (c) |  |  | 9,000,000 |  |  |  | 28,396 |
Exercises of October 22, 2010 warrants, cash |  |  | 88,242 |  |  |  | 406 |
Issued during 2011 |  |  | 9,584,131 |  |  |  | 30,400 |
As of December 31, 2011 |  |  | 71,503,883 |  |  | $ | 380,119 |
(a) | Public Offering and Over Allotment, September 2009
On September 21, 2009, we completed a public offering of Common Shares pursuant to a shelf registration statement previously filed with the United States Securities and Exchange Commission (the “SEC”) and a shelf prospectus previously filed with certain Canadian securities regulatory authorities. We offered and sold 8,800,000 Common Shares to Dahlman Rose & Company and Wellington West Capital Markets, as underwriters, at a price of $2.25 per Common Share. We granted the underwriters a 30-day option to purchase up to 1,320,000 additional Common Shares to cover over-allotments, if any. We received proceeds from the public offering, net of commissions, fees and expenses, of $17,635. On September 25, 2009, we completed the closing of the sale of 1,320,000 Common Shares pursuant to the underwriters' exercise of the over-allotment option. Consistent with the public offering of Common Shares that closed on September 21, 2009, the 1,320,000 Common Shares were sold to Dahlman Rose & Company and Wellington West Capital Markets, as underwriters, at the public offering price of $2.25 per Common Share. The over-allotment was made pursuant to our shelf registration statement filed with the SEC and a shelf prospectus filed with certain Canadian securities regulatory authorities. With the sale of the additional 1,320,000 Common Shares to the underwriters, 10,120,000 Common Shares in total were sold in connection with the offering. We received proceeds from the over-allotment, net of commissions, of $2,734.
(b) | Private Placement, October 2010
On October 22, 2010, we closed our private placement, whereby we issued an aggregate of 14,666,739 special warrants at $2.30 per special warrant, for gross proceeds of $33,733. The proceeds from the financing were placed into an escrow account with a Canadian financial institution, and upon receipt of Shareholders' Approval (as defined below), the proceeds were released to us. Upon receipt of our shareholders' approval of the private placement (“Shareholders' Approval”) on December 15, 2010, the special warrants were automatically exercised, for no additional consideration, for one Common Share of Vista and one Common Share purchase warrant (a “Warrant”). Each Warrant is exercisable over a five-year period from the closing of the private placement to purchase one Common Share (a “Warrant Share”) at a purchase price of $3.50 during the first year, $4.00 during the second year, $4.50 during the third year and $5.00 thereafter until the expiry of the Warrant. If the closing price of the Common Shares on the NYSE Amex Equities Stock Exchange is at least 35% above the current Exercise Price of the Warrants for a period of 15 consecutive trading days, then we will have the option to request that the Warrants be exercised. If the Warrants are not exercised within 25 business days following this request, they will be cancelled. See Note 10 below. We agreed to pay fees in respect of subscriptions from investors introduced to us by a finder in the United States and an agent and finder in Canada. The fees were payable in that number of special warrants equal to 5% of the number of special warrants purchased by investors introduced by that finder or agent. In addition, the finders and the agents were issued the number of compensation warrants equal to 5% of the special warrants sold to purchasers introduced by that finder or agent pursuant to the private placement with each compensation warrant being exercisable for two years from the closing of the private placement to acquire one Common Share at a price of $2.30 per Common Share. As a result, Vista issued 641,305 special warrants and 630,436 compensation warrants to the agents and finders. Vista recognized non-cash expense related to these special warrants and compensation warrants of $1,475 and $612, respectively, which was allocated pro rata between the Common Share and warrant components of the units. Upon Shareholder Approval, the special warrants issued to the finders and agents were automatically exercised and each special warrant holder received one warrant and one Common Share per special warrant. The value of the Common Shares that was recorded was $1,031. The amount allocated as cost of equity related to the special Wwarrants and compensation warrants issued to agents and finders was $1,458. See Note 10 below.
(c) | Public Offering, April 2011
On April 20, 2011, GMP Securities L.P. and Wellington West Capital Markets Inc. (collectively, the “Underwriters”) purchased, on a bought deal basis, 9,000,000 of our Common Shares at a price of C$3.30 ($3.43 based on the exchange rate on April 20, 2011) per Common Share (the “Issue Price”) for aggregate gross proceeds of C$29,700 ($30,870 based on the exchange rate on April 20, 2011) (the “Offering”). Net cash proceeds after legal and regulatory fees were $28,984. Also, in connection with the Offering, we issued 450,000 compensation options to the Underwriters with a fair value of $588 (see Note 10). The Common Shares were sold by way of a prospectus supplement to our existing base shelf prospectus dated April 27, 2009 and filed with the securities commissions in all of the provinces and territories of Canada (other than the Province of Québec) and in the United States by way of a prospectus supplement to our base shelf prospectus included in our shelf registration statement filed with the SEC on April 28, 2009. On May 20, 2011, an over-allotment option expired unexercised.

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: 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 4: 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 5: 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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 3, 4, 5, 6, 7, 8 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Article 4 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section C Reference 12: 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 13: 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 14: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 4 -Section 08 -Paragraph d Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 4 -Section E Reference 16: 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 17: 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 18: 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.(d),(e)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 1 -Section B -Paragraph 7, 11A -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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