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Note 4 - Balance Sheet Details - Property and Equipment (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property and equipment, gross $ 22,772 $ 13,840
Less: accumulated depreciation and amortization (8,095) (7,859)
Property and equipment, gross 14,677 5,981
Equipment [Member]    
Property and equipment, gross 18,077 9,742
Leasehold Improvements [Member]    
Property and equipment, gross 1,783 1,654
Computer Equipment [Member]    
Property and equipment, gross 1,190 1,420
Furniture and Fixtures [Member]    
Property and equipment, gross $ 1,722 $ 1,024