Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Revenue Recognition (Details)
6 Months Ended
Jun. 30, 2021
USM | Fixed price contract  
Revenue recognition  
Payment terms 30-day
Whole asset sales | Fixed price contract  
Revenue recognition  
Payment terms Payment is required in full
Leasing  
Revenue recognition  
Payment terms due upon receipt