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Divestiture (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jan. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Date of divestiture Jan. 31, 2016      
Total selling price       $ 5,774
Purchase obligation, due in next twelve months $ 12,000      
Long-term purchase commitment, period 2 years      
Long-term purchase commitment, amount $ 24,000      
Non-interest bearing cash advance $ 2,000 $ 0 $ 0  
Number of installment payments to be received per promissory note 36      
Proceeds from Sale of Business $ 285 1,185 1,416  
Amount financed as part of selling price $ 5,489 $ 0 $ 0  
Number of installment payments to be received 16      
Loss on Sale of Business $ 149      
Relative size of the disposal group compared to the total company, in terms of revenue 2.00%