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Summary Of Significant Accounting Policies - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash | $ 15,000,000.0 | $ 51,500,000 |
Other-than-temporary impairment losses | 0 | 0 | $ 0
Depreciation expense | $ 156,700,000 | 105,900,000 | $ 82,100,000
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 |  |
Capitalized contract costs | $ 51,500,000 | $ 34,200,000 |
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 | 85.00% | 88.00% |
Minimum |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Estimated useful life, intangible asset | 1 year |  |
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 | 66.00% | 71.00% |
Total Revenue | U.S. |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 70.00% | 71.00% | 73.00%
Total Revenue | Outside of U.S. (“OUS”) |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Concentration risk, percentage | 30.00% | 29.00% | 27.00%

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