Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Intangible Assets (Details)

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Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 16,570  
Write-off Due to Disposal (332)  
Accumulated Amortization (9,687)  
Net Carrying Amount 6,551  
Amortization of Intangible Assets $ 600 $ 700
Developed technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life (Years) 6 years  
Gross Carrying Amount $ 11,630  
Write-off Due to Disposal 0  
Accumulated Amortization (5,815)  
Net Carrying Amount $ 5,815  
Trade names    
Acquired Finite-Lived Intangible Assets [Line Items]    
Estimated Useful Life (Years) 5 years  
Gross Carrying Amount $ 4,940  
Write-off Due to Disposal (332)  
Accumulated Amortization (3,872)  
Net Carrying Amount $ 736