Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising and Promotion (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advertising and Promotion (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Advertising and promotional expense $ 0 $ 78,000 $ 3,800 $ 139,000