Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Additional Information (Details)

v3.22.2
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%