Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Contract Balances (Details)

v3.20.2
Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Summary of Significant Accounting Policies      
Contract liabilities $ (218,000) $ (218,000) $ (451,000)
Revenue included in contract balances $ 0 $ 436,000