Annual report pursuant to Section 13 and 15(d)

Goodwill and Intangible Assets, net - Summary of Intangible Assets, Net (Details)

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Goodwill and Intangible Assets, net - Summary of Intangible Assets, Net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Cost $ 28,470 $ 28,470
Accumulated amortization (14,176) (9,971)
Carrying value 14,294 18,499
Customer relationships    
Finite-Lived Intangible Assets [Line Items]    
Cost 14,660 14,660
Accumulated amortization (6,017) (4,317)
Carrying value $ 8,643 $ 10,343
Weighted average remaining life (in years) 5 years 6 months 12 days 6 years 4 months 12 days
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 6,820 $ 6,820
Accumulated amortization (3,963) (2,600)
Carrying value $ 2,857 $ 4,220
Weighted average remaining life (in years) 2 years 2 months 12 days 3 years 1 month 12 days
Trade names    
Finite-Lived Intangible Assets [Line Items]    
Cost $ 6,990 $ 6,990
Accumulated amortization (4,196) (3,054)
Carrying value $ 2,794 $ 3,936
Weighted average remaining life (in years) 4 years 4 years 7 months 12 days