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Acquisitions - Additional Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Nov. 30, 2018
USD ($)
Dec. 31, 2019
USD ($)
businessCombination
Dec. 31, 2018
USD ($)
businessCombination
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Business Acquisition [Line Items]          
Future obligation to purchase capital equipment   $ 292,299   $ 292,299  
Motivate          
Business Acquisition [Line Items]          
Cash consideration transferred in acquisition $ 250,900        
Acquisition costs         $ 2,600
Revenue of acquiree       0 0
Net loss of acquiree       $ 0 $ 0
Purchase obligation commitment period       5 years  
Future obligation to purchase capital equipment $ 100,000        
Motivate | Minimum | Contractual Relationships - Cities          
Business Acquisition [Line Items]          
Weighted-average remaining useful life 3 years        
Motivate | Maximum | Contractual Relationships - Cities          
Business Acquisition [Line Items]          
Weighted-average remaining useful life 12 years        
Other Acquisitions          
Business Acquisition [Line Items]          
Cash consideration transferred in acquisition     $ 62,000    
Number of business combinations completed | businessCombination   2 2    
Cash paid for acquisitions     $ 35,000    
Value of redeemable convertible preferred stock issued in acquisitions     25,300    
Liabilities incurred related to indemnification     $ 1,700