Quarterly report pursuant to Section 13 or 15(d)

ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details)

v3.21.1
ACCOUNTS RECEIVABLE - Allowance for doubtful accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
ACCOUNTS RECEIVABLE    
Balance at beginning of period $ 500 $ 199
Provision for uncollectible accounts 72 377
Uncollectible accounts written off (208) (76)
Balance at end of period $ 364 $ 500