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Other Financial Statement Data (Schedule of Other Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
OTHER FINANCIAL STATEMENT DATA [Abstract]    
Deferred rent $ 521 $ 0
Warranty liability 31 54
Contract liabilities - Topic 606 73 0
Deferred warranty revenue 4 34
Other liabilities $ 629 $ 88