v3.20.2
Supplemental Financial Statement Information - Schedule of Customer Deposits (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Customer Deposits [Roll Forward]      
Beginning balance   $ 3,152,000  
Increases due to deposits received, net of other adjustments   7,353,000  
Revenue recognized $ 0 (7,912,000) $ 0
Ending balance   $ 2,593,000