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Intangible Assets - Estimated Amortization of Intangible Assets with Determinable Lives (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Finite Lived Intangible Assets [Line Items]    
2019 (remaining six months) $ 10,632  
2020 20,611  
2021 16,071  
2022 7,753  
2023 3,627  
2024 and beyond 4,533  
Net intangible assets 63,227 $ 74,091
Operating Expense    
Finite Lived Intangible Assets [Line Items]    
2019 (remaining six months) 2,056  
2020 3,460  
2021 2,803  
2022 2,273  
2023 1,866  
2024 and beyond 4,173  
Net intangible assets 16,631  
Cost of Revenue    
Finite Lived Intangible Assets [Line Items]    
2019 (remaining six months) 8,576  
2020 17,151  
2021 13,268  
2022 5,480  
2023 1,761  
2024 and beyond 360  
Net intangible assets $ 46,596