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Balance Sheet Components - Additional Information (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Customer | Sep. 30, 2019 USD ($) Customer | Dec. 31, 2019 USD ($)
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Unbilled Receivables | $ 1,659,000 |  | $ 1,659,000 |  | $ 590,000
Accounts receivable, net | $ 31,691,000 |  | $ 31,691,000 |  | 34,325,000
Percentage of Non-US revenue invoiced in Euros | 83.40% | 70.30% | 75.60% | 71.20% |
Transfer of inventory to rental equipment |  |  | $ 1,795,000 | $ 798,000 |
Salvage value of expenditures for additions, improvements and replacements | $ 0 |  | 0 |  |
Repairs and maintenance expense | 653,000 | $ 938,000 | 1,776,000 | 2,301,000 |
Depreciation and amortization | 2,457,000 | 2,393,000 | 6,907,000 | 7,295,000 |
Impairments of long-lived assets |  |  | 0 | 0 |
Impairment of finite lived intangible assets |  |  | 0 | 0 |
Amortization of intangible assets | 2,255,000 | $ 1,269,000 | 6,747,000 | 1,921,000 |
Construction in Process and Computer Software or Development Cost |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Depreciation and amortization |  |  | 0 | $ 0 |
Other Noncurrent Assets |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Noncurrent inventories expected to be realized or consumed | 2,459,000 |  | 2,459,000 |  | 1,076,000
Customer Concentration Risk | Customer One |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | 9,386,000 |  | 9,386,000 |  | 10,695,000
Customer Concentration Risk | Customer Two |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | $ 5,568,000 |  | $ 5,568,000 |  | $ 5,228,000
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  | 1 | 0 |
Net Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  | 2 |  |
Raw materials | Supplier Concentration Risk | Vendor one |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 20.70% | 22.10% |
Raw materials | Supplier Concentration Risk | Vendor two |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 11.10% | 13.80% |
Raw materials | Supplier Concentration Risk | Vendor three |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration risk, percentage |  |  | 9.70% | 9.70% |

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