Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Accounts Receivable (Details)

v3.21.2
Summary of Significant Accounting Policies - Accounts Receivable (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Summary of Significant Accounting Policies    
Customer allowance for prompt payment discounts $ 113,000 $ 171,000