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Balance Sheet Components - Short-Term Line of Credit (Narrative) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Apr. 17, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]      
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 AR   80.00%  
Line of credit facility, maximum borrowing capacity under non-formula advances   $ 10,000  
Short term line of credit $ 4,329   $ 0
Weighted average interest rate 3.50%