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Summary Of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Dec. 31, 2020
USD ($)
segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Restricted cash $ 18,000,000.0 $ 15,000,000.0  
Other-than-temporary impairment losses 0 0 $ 0
Depreciation expense $ 220,600,000 $ 156,700,000 $ 105,900,000
Number of operating segments | segment 1    
Performance obligation period The Company’s system sale arrangements generally include a five-year period of service. The first year of service is generally free and included in the system sale arrangement, and the remaining four years are generally included at a stated service price.    
System sales arrangement, warranty period 1 year    
Market-based implied volatility (period) 1 year    
Market-based implied volatility (percent) 100.00%    
Cash flow hedges de-designated (period) 2 months    
Likelihood of tax benefits being realized upon ultimate settlement 50.00%    
Long-lived assets, percent 83.00% 85.00%  
Service Fee Credit $ 80,000,000    
Sales-type Lease, Lease Receivable, Extended Payment 15,000,000    
Accounts Receivable, Extended Payment 181,000,000    
Accounts Receivable, Deferred Lease Billing and Extended Payments, Outstanding $ 19,000,000    
Minimum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life, intangible asset 2 years    
Sales-type leases term 24 months    
Maximum      
Summary Of Significant Accounting Policies [Line Items]      
Estimated useful life, intangible asset 9 years    
Sales-type leases term 84 months    
Derivative, term of contract 12 months    
Maximum | Internal use software      
Summary Of Significant Accounting Policies [Line Items]      
Useful Lives 5 years    
Accounts Receivable | U.S.      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 67.00% 66.00%  
Total Revenue | U.S.      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 68.00% 70.00% 71.00%
Total Revenue | Outside of U.S. (“OUS”)      
Summary Of Significant Accounting Policies [Line Items]      
Concentration risk, percentage 32.00% 30.00% 29.00%