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Significant Accounting Policies - Impact of the Adoption of ASC 606 on consolidated Balance Sheet (Table) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets    
Trade accounts receivable $ 24,708 $ 18,521
Other current assets 5,638 5,157
Liabilities    
Deferred revenue 6,523 7,229
Accrued liabilities 11,475 10,521
Balances without Adoption of ASC 606    
Assets    
Trade accounts receivable 27,212  
Other current assets 3,098  
Liabilities    
Deferred revenue 5,231  
Accrued liabilities 11,495  
Effect of Adoption of ASC 606    
Assets    
Trade accounts receivable (2,504) (2,383)
Other current assets 2,540 1,660
Liabilities    
Deferred revenue (1,292) (1,137)
Accrued liabilities $ 20 $ 3