Quarterly report pursuant to Section 13 or 15(d)

Note 3 - Balance Sheet Components - Summary of Balance Sheet Amounts (Details)

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Note 3 - Balance Sheet Components - Summary of Balance Sheet Amounts (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Cash, cash equivalents and restricted cash:        
Cash $ 22,408 $ 13,720    
Cash equivalents 68,381 82,315    
Cash and cash equivalents 90,789 96,035    
Restricted cash 517 3,390    
Cash, cash equivalents and restricted cash 91,306 99,425 $ 103,994 $ 135,651
Inventories:        
Finished goods 3,844 6,142    
Raw materials 836 1,249    
Reserve for obsolescence (421) (987)    
Inventories 4,259 6,404    
Other accrued expenses:        
Sales returns 207 373    
Employee-related expense 941 1,258    
Warehousing, inventory-related and other 638 756    
Other accrued expenses 1,786 2,387    
Deferred revenue:        
Deferred revenue 3,477 4,506    
Unshipped Product [Member]        
Deferred revenue:        
Deferred revenue 1,397 2,390    
Auto ship advances [Member]        
Deferred revenue:        
Deferred revenue 1,971 1,985    
Product and Service, Other [Member]        
Deferred revenue:        
Deferred revenue $ 109 $ 131