Quarterly report pursuant to Section 13 or 15(d)

SIGNIFICANT ACCOUNTING POLICIES - performance (Details)

v3.21.2
SIGNIFICANT ACCOUNTING POLICIES - performance (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue recognized from performance obligations satisfied $ 0 $ 0
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Revenue recognized from performance obligations satisfaction period 12 months