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Business Combinations - Summary of Fair Values of Tangible and Intangible Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Feb. 02, 2018
Business Acquisition [Line Items]    
Goodwill $ 31,004  
Useful life of acquired intangible assets 7 years  
Digital Fuel    
Business Acquisition [Line Items]    
Cash   $ 97
Accounts receivable   6,267
Other tangible assets   2,804
Accounts payable, deferred revenue and other liabilities   (16,917)
Net assets acquired   12,751
Goodwill   31,004
Total   43,755
Digital Fuel | Acquired developed technology    
Business Acquisition [Line Items]    
Purchase consideration of finite-lived intangibles   8,100
Useful life of acquired intangible assets 4 years  
Digital Fuel | Customer contracts and related relationships    
Business Acquisition [Line Items]    
Purchase consideration of finite-lived intangibles   11,400
Useful life of acquired intangible assets 10 years  
Digital Fuel | Order backlog    
Business Acquisition [Line Items]    
Purchase consideration of finite-lived intangibles   500
Useful life of acquired intangible assets 2 years  
Digital Fuel | Trademarks and trade name    
Business Acquisition [Line Items]    
Purchase consideration of finite-lived intangibles   $ 500
Useful life of acquired intangible assets 3 years