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Business Combinations - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Oct. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
[1]
Dec. 31, 2016
Business Acquisition [Line Items]        
Goodwill   $ 148,845 $ 128,728 $ 82,534
SkyGiraffe Inc.        
Business Acquisition [Line Items]        
Net tangible assets acquired $ 675      
Goodwill 19,386      
Net deferred tax liabilities (3,341)      
Total purchase price 32,320      
Developed technology | SkyGiraffe Inc.        
Business Acquisition [Line Items]        
Developed technology $ 15,600      
Useful Life (in years) 5 years      
[1] As adjusted to reflect the impact of the full retrospective adoption of Topic 606.