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Note 2 - Summary of Significant Accounting Policies (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
ft²
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2017
ft²
Retained Earnings (Accumulated Deficit), Ending Balance       $ (539,805) $ (500,654)  
Working Capital (Deficit)       44,800    
Cash and Cash Equivalents, at Carrying Value, Ending Balance       $ 59,424 60,541  
Number of Operating Segments       1    
Impairment, Long-Lived Asset, Held-for-Use, Total       $ 0 $ 5,784  
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]            
Operating Lease, Impairment Loss   $ 2,400 $ 2,400      
Impairment of Leasehold   $ 500 $ 500      
Impairment, Long-Lived Asset, Held-for-Use, Total       $ 5,800    
The 1020 Marsh Road Facility [Member] | Grail, Inc [Member]            
Area of Real Estate Property (Square Foot) | ft² 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      
Minimum [Member]            
Property, Plant and Equipment, Useful Life (Year)       3 years    
Maximum [Member]            
Property, Plant and Equipment, Useful Life (Year)       5 years