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, 2021
Dec. 31, 2020
Cash $ 18,091 $ 23,977
Cash equivalents 66,549 68,390
Cash and cash equivalents 84,640 92,367
Restricted cash 524 525
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Ending Balance 85,164 92,892
Inventories:    
Finished goods 3,851 3,071
Raw materials 602 1,047
Reserve for obsolescence (63) (339)
Inventory, Net, Total 4,390 3,779
Other accrued expenses:    
Sales returns 127 189
Employee-related expense 917 1,149
Warehousing, inventory-related and other 714 584
Accrued Liabilities, Current, Total 1,758 1,922
Deferred revenue:    
Deferred revenue 6,038 3,091
Unshipped Product [Member]    
Deferred revenue:    
Deferred revenue 4,023 1,005
Auto ship advances [Member]    
Deferred revenue:    
Deferred revenue 1,909 1,977
Product and Service, Other [Member]    
Deferred revenue:    
Deferred revenue $ 106 $ 109