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Balance Sheet Components - Additional Information (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) Customer | Jun. 30, 2021 USD ($) Customer | Dec. 31, 2021 USD ($) Customer
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | $ 31,146,000 |  | $ 31,146,000 |  | $ 24,452,000
Percentage of Non-US revenue invoiced in Euros | 77.40% | 67.40% | 75.60% | 72.40% |
Transfer of inventory to rental equipment |  |  | $ 692,000 | $ 706,000 |
Salvage value of expenditures for additions, improvements and replacements | $ 0 |  | 0 |  |
Repairs and maintenance expense |  |  | 2,230,000 | 1,674,000 |
Depreciation and amortization | 3,698,000 | $ 3,038,000 | 7,311,000 | 5,872,000 |
Impairments of long-lived assets |  |  | 0 | 0 |
Goodwill impairment loss |  |  | 0 |  |
Impairment of finite lived intangible assets |  |  | 0 |  | 0
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 | 734,000 |  | 734,000 |  | 1,943,000
Prepaid Expenses and Other Current Assets |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Inventory raw materials | 12,854,000 |  | 12,854,000 |  | 15,426,000
Customer Concentration Risk | Customer One |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | 3,867,000 |  | 3,867,000 |  | 5,945,000
Customer Concentration Risk | Medicare's Service Reimbursement Programs |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Accounts receivable, net | $ 2,461,000 |  | $ 2,461,000 |  | $ 2,685,000
Sales Revenue, Net | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  |  | 1 |
Sales Revenue, Net | Customer Concentration Risk | Medicare's Service Reimbursement Programs |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 11.60% | 9.30% |
Net Accounts Receivable | Customer Concentration Risk |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Number of customers | Customer |  |  | 1 |  | 1
Net Accounts Receivable | Customer Concentration Risk | Medicare's Service Reimbursement Programs |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 7.90% |  | 11.00%
Rental Revenue | Customer Concentration Risk | Medicare's Service Reimbursement Programs |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 78.50% | 83.10% |
Raw materials | Supplier Concentration Risk | Vendor one |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 24.40% | 16.30% |
Raw materials | Supplier Concentration Risk | Vendor two |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 22.30% | 14.10% |
Raw materials | Supplier Concentration Risk | Vendor three |  |  |  |  |
Schedule Of Balance Sheet Components [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  | 8.80% | 11.70% |

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