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Other Current Assets (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid expenses $ 3,824 $ 3,189
Sales taxes receivable from customers 220 598
Due from prior owners of acquired businesses for working capital settlements 720 955
Research and development tax credits receivable 720 266
Other 64 108
Total $ 5,548 $ 5,116