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Accrued Expenses (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Payables and Accruals [Abstract] |  |
Payroll taxes | $ 1,893 | $ 1,786
Payroll | 3,141 | 2,075
Bonuses | 5,778 | 2,736
Commissions | 894 | 912
Vacation | 5,066 | 4,362
Royalties | 1,368 | 1,310
Value-added tax | 1,158 | 1,018
Other accrued expenses | 7,971 | 5,998
Total | $ 27,269 | $ 20,197

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