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Supplemental Consolidated Balance Sheet Information (Tables) | 12 Months Ended
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Dec. 31, 2020
Supplemental Consolidated Financial Statement Information |
Schedule of allowance for doubtful accounts | The activity in the allowance for doubtful accounts (in thousands) for the years ended December 31, 2020 and 2019 was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | ​ | 2020 | ​ | ​ | 2019
Beginning balance | ​ | $ | (250) | ​ | $ | (250)
Additional provisions to allowance | ​ | ​ | (1,625) | ​ | ​ | —
Write-offs against allowance - A/R | ​ | ​ | 191 | ​ | ​ | —
Write-offs against allowance - N/R | ​ | ​ | 1,434 | ​ | ​ | —
Recoveries collected | ​ | ​ | — | ​ | ​ | —
Ending balance | ​ | $ | (250) | ​ | $ | (250)
Schedule of other current liabilities | Other current liabilities (in thousands) consist of the following at December 31, 2020 and 2019:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Accrued self-insurance reserves | ​ | $ | 851 | ​ | $ | 2,771
Other accrued expenses and current liabilities | ​ |  | 960 | ​ |  | 828
Other current liabilities | ​ | $ | 1,811 | ​ | $ | 3,599
Schedule of operating revenues disaggregated by geographic region |
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | ​ | 2020 | ​ | ​ | 2019
Operating revenues | ​ | ​ | ​ | ​ | ​ | ​
United States | ​ | $ | 73,983 | ​ | $ | 129,452
Canada | ​ | ​ | 12,117 | ​ | ​ | 16,321
Total | ​ | $ | 86,100 | ​ | $ | 145,773

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