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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands, € in Millions
12 Months Ended
Jun. 10, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2022
EUR (€)
Dec. 31, 2021
USD ($)
Retained Earnings (Accumulated Deficit), Total   $ (860,935)   $ (785,374)
Working Capital   76,500    
Overstated Raw Materials, Amount       2,500
Restricted Cash, Total   1,100   1,100
Debt Securities, Available-for-Sale, Realized Gain (Loss), Total   0   0
Accounts Receivable, Allowance for Credit Loss, Ending Balance   1,600   1,700
Accounts Receivable, Credit Loss Expense (Reversal)   9   144
Property, Plant and Equipment, Including Purchased Software, Impairment Charges   1,400   0
Other Income, Employer Retention Tax Credit   0   1,311
Proceeds From Employee Retention Tax Credit   700    
Employer Retention Tax Credit Receivable   554   1,311
Letters of Credit Outstanding, Amount   0    
Business Combination, Contingent Consideration, Liability, Total   $ 1,256   $ 2,371
Period Of Service Sale Arrangement (Year)   5 years 5 years  
Period of Service Sale Arrangement at Stated Service Price (Year)   4 years 4 years  
Lessor, Operating Lease, Payments to be Received, Total   $ 2,200    
Number of Operating Segments   1 1  
Senhance Surgical Robotic System Acquisition[Member]        
Business Combination, Contingent Consideration, Liability, Total   $ 1,300    
Business Combination, Contingent Consideration, Liability, Related Milestone | €     € 15  
Letter of Credit [Member]        
Line of Credit Facility, Remaining Borrowing Capacity   $ 600    
Paycheck Protection Program CARES Act [Member]        
Debt Instrument, Decrease, Forgiveness $ 2,800      
Minimum [Member]        
Lessee, Operating Lease, Term of Contract (Year)   1 year    
Lessee, Operating Lease, Renewal Term (Year)   1 year    
Minimum [Member] | Senhance Surgical Robotic System Acquisition[Member]        
Business Combination Contingent Consideration Arrangements Target Revenue | €     € 25  
Maximum [Member]        
Lessee, Operating Lease, Term of Contract (Year)   10 years    
Lessee, Operating Lease, Renewal Term (Year)   6 years    
Patents [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   10 years 10 years  
Developed Technology Rights [Member] | Minimum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   5 years 5 years  
Developed Technology Rights [Member] | Maximum [Member]        
Finite-Lived Intangible Asset, Useful Life (Year)   7 years 7 years  
Intellectual Property [Member]        
Impairment of Intangible Assets, Finite-lived   $ 0    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]        
Number of Major Customers   1 1  
Concentration Risk, Percentage   69.00% 69.00%  
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Three Customers [Member]        
Number of Major Customers       3
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer One [Member]        
Concentration Risk, Percentage       26.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Two [Member]        
Concentration Risk, Percentage       20.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Customer Three [Member]        
Concentration Risk, Percentage       14.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]        
Number of Major Customers   1 1  
Concentration Risk, Percentage   47.00% 47.00%  
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer One [Member]        
Concentration Risk, Percentage       36.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Customer Two [Member]        
Concentration Risk, Percentage       16.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]        
Number of Major Customers       2