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Balance Sheet Components (Short-Term Line of Credit) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Line of credit facility, maximum borrowing capacity $ 10,000  
Line of credit facility, component of calculation for maximum borrowing amount under formula advances $ 2,500  
Line of credit facility, maximum borrowing capacity, limited by eligible A/R 80.00%  
Line of credit facility, maximum borrowing capacity under non-formula advances $ 10,000  
Line of credit facility, annual interest rate equal to lender's prime rate plus 0.25%  
Line of credit facility, outstanding borrowings $ 0 $ 0