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Goodwill and Intangible Assets, Net - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
reporting_segment
reporting_unit
segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]          
Number of operating segments | segment     1    
Number of reportable segments | reporting_segment     1    
Number of reporting units | reporting_unit     1    
Goodwill impairment loss $ 0   $ 0   $ 0
Impairment of intangible assets 0   0   $ 0
Amortization expense $ 119,000 $ 88,000 211,000 $ 176,000  
Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets decrease in carrying value related to foreign exchange impact     133,000    
Amortization expense period increase     197,000    
Offset to amortization expense during period related to foreign exchange impact     61,000    
SlimCut | Customer relationships          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired     2,900,000    
SlimCut | Technology          
Finite-Lived Intangible Assets [Line Items]          
Intangible assets acquired     1,000,000    
Intangible assets accumulated amortization acquired     $ 12,000