Quarterly report pursuant to Section 13 or 15(d)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Cash and Cash Equivalents, Restricted Cash and Restricted Cash, noncurrent) (Details)

v3.21.2
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Cash and Cash Equivalents, Restricted Cash and Restricted Cash, noncurrent) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents        
Cash and cash equivalents $ 63,867 $ 47,786    
Restricted cash 3,442 2,252    
Restricted cash, noncurrent 709 795    
Total Cash and cash equivalents, Restricted cash and Restricted cash, noncurrent $ 68,018 $ 50,833 $ 16,504 $ 31,964