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Business Combinations - Additional Information (Details) - USD ($)
$ in Thousands
Nov. 09, 2018
Sep. 10, 2018
Jun. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Business Acquisition [Line Items]          
Build-to-suit property capitalized       $ 5,000  
Facility financing lease obligation recognized     $ 0   $ 46,100
Workpop Inc.          
Business Acquisition [Line Items]          
Cash paid in acquisition   $ 18,200      
Acquisition-related costs   500      
Cost basis in investment   $ 500      
Workpop Inc. | Developed Technology          
Business Acquisition [Line Items]          
Useful life of intangible asset   3 years      
Grovo Learning, Inc.          
Business Acquisition [Line Items]          
Cash paid in acquisition $ 22,900        
Acquisition-related costs 600        
Facility financing lease obligation recognized 46,100        
Grovo Learning, Inc. | Build to suit property          
Business Acquisition [Line Items]          
Build-to-suit property capitalized $ 51,100        
Grovo Learning, Inc. | Developed Technology          
Business Acquisition [Line Items]          
Useful life of intangible asset 3 years