Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Contract Balances (Details)

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Summary of Significant Accounting Policies - Contract Balances (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Summary of Significant Accounting Policies    
Contract liabilities $ 715,000 $ 373,000
Revenue included in contract balances $ 373,000