Quarterly report pursuant to Section 13 or 15(d)

OTHER SUPPLEMENTAL INFORMATION - Other current assets (Details)

v3.21.2
OTHER SUPPLEMENTAL INFORMATION - Other current assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Unamortized commercial insurance premiums $ 3,321 $ 1,903
Prepaid expenses 1,354 432
Letters of credit 883 474
Cash collateral on commercial insurance claims 595 585
Surety bond 500 45
Workers compensation refund   265
Prepaid health insurance premiums   207
Other short-term assets 628 449
Total 11,526 6,457
Canada    
Sales tax receivable $ 4,245 $ 2,097