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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 9 Months Ended
Jun. 30, 2018
Sep. 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