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Schedule II - Valuation And Qualifying Accounts | 12 Months Ended
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Dec. 31, 2011
Schedule II - Valuation And Qualifying Accounts [Abstract] |
Schedule II - Valuation And Qualifying Accounts | SCHEDULE II VASCO DATA SECURITY INTERNATIONAL, INC. VALUATION AND QUALIFYING ACCOUNTS
|  |  |  |  | Additions |  |  | Deductions |  |  |  |
|  | Beginning balance |  |  | Bad debt expense/ (recovery) |  |  | Foreign currency translation |  |  | Accounts written off |  |  | Ending balance |
Allowance for doubtful accounts for trade accounts receivable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Year ended December 31, 2011 |  | $ | 1,274 |  |  |  | 333 |  |  |  | (22 | ) |  |  | 0 |  |  | $ | 1,585 |
Year ended December 31, 2010 |  | $ | 1,201 |  |  |  | 114 |  |  |  | (36 | ) |  |  | (5 | ) |  | $ | 1,274 |
Year ended December 31, 2009 |  | $ | 708 |  |  |  | 472 |  |  |  | 43 |  |  |  | (22 | ) |  | $ | 1,201 |

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 09 -Article 12 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e24092-122690 + Details
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