Segment and Geographic Information - Additional Information (Details) $ in Thousands	9 Months Ended
Sep. 30, 2020 USD ($) Segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| Segment	1
Number of reportable segments \| Segment	1
Lease Revenue
Segment Reporting Information [Line Items]
System sales with typical lease terms	36 months
System Revenue
Segment Reporting Information [Line Items]
Systems sales with payment terms	12 months
United States
Segment Reporting Information [Line Items]
Long-lived assets \| $	$ 20,866	$ 23,883
Foreign
Segment Reporting Information [Line Items]
Long-lived assets \| $	$ 2,600	$ 3,103

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e9038-108599

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Sales with payment terms.

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- Definition

Sales with typical lease terms.

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