Quarterly report pursuant to Section 13 or 15(d)

Balance Sheet Components - Accrued liabilities (Details)

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Balance Sheet Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Balance Sheet Components    
Accrued vacation $ 309 $ 263
Customer advances 135 451
Accrued audit fees 123 140
Accrued compensation 40 38
Accrued rebate   204
Accrued other 48 50
Total accrued liabilities $ 655 $ 1,146 [1]
[1] The condensed consolidated balance sheet as of December 31, 2019 was derived from the audited consolidated balance sheet as of that date.