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Note 3 - Balance Sheet Components - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Property and equipment, gross $ 60,421 $ 60,217
Less: Accumulated depreciation and amortization (49,396) (48,402)
Property and equipment, net $ 11,025 11,815 [1]
Software, Including Internally Developed Software [Member]    
Estimated useful life of property and equipment (Year) 3 years  
Property and equipment, gross $ 26,000 25,518
Computer Equipment [Member]    
Property and equipment, gross $ 22,721 22,714
Computer Equipment [Member] | Minimum [Member]    
Estimated useful life of property and equipment (Year) 3 years  
Computer Equipment [Member] | Maximum [Member]    
Estimated useful life of property and equipment (Year) 4 years  
Finance Lease and Right-of-Use Assets [Member]    
Property and equipment, gross $ 5,067 5,067
Leasehold Improvements [Member]    
Property and equipment, gross 4,645 4,778
Office Equipment, Furniture and Fixtures [Member]    
Property and equipment, gross $ 1,988 $ 2,140
Office Equipment, Furniture and Fixtures [Member] | Minimum [Member]    
Estimated useful life of property and equipment (Year) 3 years  
Office Equipment, Furniture and Fixtures [Member] | Maximum [Member]    
Estimated useful life of property and equipment (Year) 5 years  
[1] Derived from the Company's audited consolidated financial statements as of December 31, 2018.