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Note 2 - Summary of Significant Accounting Policies 1 (Details Textual)
$ in Thousands, € in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 10, 2021
USD ($)
Jan. 29, 2021
USD ($)
Jan. 12, 2021
USD ($)
Apr. 27, 2020
USD ($)
Jan. 31, 2021
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Retained Earnings (Accumulated Deficit), Ending Balance             $ (785,374)   $ (722,912)  
Working Capital             103,400      
Proceeds from Warrant Exercises             30,600      
Cash, Cash Equivalents, Short-term and Long-term Investments, Excluding Restricted Cash             135,800      
Restricted Cash and Cash Equivalents, Noncurrent, Total             1,154   1,166  
Debt Securities, Available-for-sale, Total             117,697   0  
Debt Securities, Available-for-sale, Realized Gain (Loss), Total             0   0 $ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax, Total                 0 0
Accounts Receivable, Credit Loss Expense (Reversal)             144   0 1,634
Accounts Receivable, Allowance for Credit Loss, Ending Balance             1,677   1,802  
Impairment of Intangible Assets, Finite-lived             0   0 7,912
Other Income, Employer Retention Tax Credit             1,311   0 0
Business Combination, Contingent Consideration, Liability, Total             $ 2,371   3,936  
Period Of Service Sale Arrangement (Year)             5 years 5 years    
Period of Service Sale Arrangement at Stated Service Price (Year)             4 years 4 years    
Operating Lease, Lease Income, Total             $ 1,300   700 0
Revenue, Remaining Performance Obligation, Amount             3,000   3,100 3,700
Contract with Customer, Asset, after Allowance for Credit Loss, Current, Total             100   100  
Contract with Customer, Liability, Revenue Recognized             600   600 1,000
Share-based Payment Arrangement, Expense             $ 9,400   7,900 11,500
Number of Operating Segments             1 1    
Assets, Total             $ 186,473   78,258  
Non-US [Member]                    
Assets, Total             43,200   56,800  
Senhance Surgical Robotic System Acquisition[Member]                    
Business Combination, Contingent Consideration, Liability, Total             $ 2,400      
Business Combination, Contingent Consideration, Liability, Related Milestone | €               € 15    
Paycheck Protection Program CARES Act [Member]                    
Debt Instrument, Decrease, Forgiveness $ 2,800     $ 2,800            
Minimum [Member] | Senhance Surgical Robotic System Acquisition[Member]                    
Business Combination Contingent Consideration Arrangements Target Revenue | €               € 25    
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   0 0
In Process Research and Development [Member]                    
Impairment of Intangible Assets, Finite-lived           $ 7,900     $ 0 $ (7,912)
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Three Customers [Member]                    
Number of Major Customers             3 3    
Concentration Risk, Percentage             61.00% 61.00%    
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Seven Customers [Member]                    
Number of Major Customers                 7  
Concentration Risk, Percentage                 68.00%  
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]                    
Number of Major Customers             2 2    
Concentration Risk, Percentage             52.00% 52.00%    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Nine Customers [Member]                    
Number of Major Customers                 9  
Concentration Risk, Percentage                 55.00%  
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Six Customers [Member]                    
Number of Major Customers                   6
Concentration Risk, Percentage                   82.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | UNITED STATES                    
Concentration Risk, Percentage             13.00% 13.00% 27.00% 6.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Europe [Member]                    
Concentration Risk, Percentage             62.00% 62.00% 53.00% 39.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | Asia [Member]                    
Concentration Risk, Percentage             25.00% 25.00% 20.00% 55.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | GERMANY                    
Concentration Risk, Percentage             47.00% 47.00% 28.00% 23.00%
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | JAPAN                    
Concentration Risk, Percentage             22.00% 22.00% 10.00%  
Revenue Benchmark [Member] | Geographic Concentration Risk [Member] | TAIWAN, PROVINCE OF CHINA                    
Concentration Risk, Percentage                 10.00% 53.00%
Assets, Total [Member] | Geographic Concentration Risk [Member] | UNITED STATES                    
Concentration Risk, Percentage             77.00% 77.00% 27.00%  
Assets, Total [Member] | Geographic Concentration Risk [Member] | Non-US [Member]                    
Concentration Risk, Percentage             23.00% 23.00% 73.00%  
Long-lived Assets [Member] | Geographic Concentration Risk [Member] | UNITED STATES                    
Concentration Risk, Percentage             63.00% 63.00% 11.00%  
Long-lived Assets [Member] | Geographic Concentration Risk [Member] | SWITZERLAND                    
Concentration Risk, Percentage             22.00% 22.00% 41.00%  
Long-lived Assets [Member] | Geographic Concentration Risk [Member] | ITALY                    
Concentration Risk, Percentage             13.00% 13.00% 48.00%  
Public Offering [Member]                    
Proceeds from Issuance of Common Stock   $ 79,600     $ 73,400          
Registered Direct Offering [Member]                    
Proceeds from Issuance of Common Stock     $ 28,600   28,600          
ATM Offering [Member]                    
Proceeds from Issuance of Common Stock         $ 27,300          
The 2021 ATM Offering [Member]                    
Payments of Stock Issuance Costs             $ 2,800