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BALANCE SHEET DETAILS - Schedule of Other Current Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Other current liabilities:    
Accrued contract costs $ 140 $ 353
Warranty costs 90 91
Accrued professional fees 1,074 602
Accrued other taxes 1,063 1,087
Other 2,381 3,154
Total other current liabilities $ 4,748 $ 5,287