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
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Cash, cash equivalents and restricted cash:        
Cash $ 14,020 $ 13,720    
Cash equivalents 79,186 82,315    
Cash and cash equivalents 93,206 96,035    
Restricted cash 513 3,390    
Cash, cash equivalents and restricted cash 93,719 99,425 $ 111,106 $ 135,651
Inventories:        
Finished goods 3,368 6,142    
Raw materials 1,253 1,249    
Reserve for obsolescence (507) (987)    
Inventories 4,114 6,404    
Other accrued expenses:        
Sales returns 195 373    
Employee-related expense 994 1,258    
Warehousing, inventory-related and other 574 756    
Other accrued expenses 1,763 2,387    
Deferred revenue:        
Deferred revenue 2,645 4,506    
Unshipped Product [Member]        
Deferred revenue:        
Deferred revenue 584 2,390    
Auto ship advances [Member]        
Deferred revenue:        
Deferred revenue 1,955 1,985    
Product and Service, Other [Member]        
Deferred revenue:        
Deferred revenue $ 106 $ 131