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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2021
USD ($)
ft²
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
ft²
Jun. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2017
ft²
Retained Earnings (Accumulated Deficit), Ending Balance $ (515,763) $ (515,763)       $ (515,763)     $ (500,654)  
Working Capital (Deficit) 68,100 68,100       68,100        
Cash and Cash Equivalents, at Carrying Value, Ending Balance $ 75,437 75,437       $ 75,437     $ 60,541  
Number of Operating Segments           1        
Impairment, Long-Lived Asset, Held-for-Use, Total   $ 0   $ 0   $ 0 $ 2,870      
Assembled Workforce [Member]                    
Finite-Lived Intangible Asset, Useful Life (Year)           3 years        
The 1020 Marsh Road Facility [Member]                    
Area of Real Estate Property (Square Foot) | ft²                   34,500
The 1020 Marsh Road Facility [Member] | EVA Automation, Inc. [Member]                    
Impairment, Long-Lived Asset, Held-for-Use, Total               $ 5,800    
Impairment, Lessor Asset under Operating Lease     $ 2,400   $ 2,400          
The 1020 Marsh Road Facility [Member] | EVA Automation, Inc. [Member] | Leasehold Improvements [Member]                    
Impairment, Long-Lived Asset, Held-for-Use, Total     $ 500   $ 500          
The 1020 Marsh Road Facility [Member] | Grail, Inc [Member]                    
Area of Real Estate Property (Square Foot) | ft² 34,464 34,464       34,464        
Sublease Income $ 7,650                  
Measurement Input, Discount Rate [Member] | Valuation Technique, Discounted Cash Flow [Member] | The 1020 Marsh Road Facility [Member] | EVA Automation, Inc. [Member]                    
Right of Use and Leasehold Improvement Assets, Measurement Input     0.095   0.095     0.095    
Minimum [Member]                    
Property, Plant and Equipment, Useful Life (Year)           3 years        
Maximum [Member]                    
Property, Plant and Equipment, Useful Life (Year)           5 years