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
Mar. 31, 2021
Dec. 31, 2020
Cash $ 23,993 $ 23,977
Cash equivalents 66,221 68,390
Cash and cash equivalents 90,214 92,367
Restricted cash 522 525
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance 90,736 92,892
Inventories:    
Finished goods 3,275 3,071
Raw materials 635 1,047
Reserve for obsolescence (283) (339)
Inventory, Net, Total 3,627 3,779
Other accrued expenses:    
Sales returns 182 189
Employee-related expense 879 1,149
Warehousing, inventory-related and other 609 584
Accrued Liabilities, Current, Total 1,670 1,922
Deferred revenue:    
Deferred revenue 4,169 3,091
Unshipped Product [Member]    
Deferred revenue:    
Deferred revenue 2,117 1,005
Auto ship advances [Member]    
Deferred revenue:    
Deferred revenue 1,946 1,977
Product and Service, Other [Member]    
Deferred revenue:    
Deferred revenue $ 106 $ 109