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Supplemental Consolidated Financial Statement Information | 12 Months Ended
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Dec. 31, 2020
Supplemental Consolidated Financial Statement Information |
Supplemental Consolidated Financial Statement Information | 5. Supplemental Consolidated Financial Statement Information 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)
​ 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
​ Disaggregated Revenues The Company has one line of business, acquiring and processing seismic data in North America. Our chief operating decision maker (President, CEO, and Chairman of the Board) makes operating decisions and assesses performance based on the Company as a whole. Accordingly, the Company is considered to be in a single reportable segment. The following table presents the Company’s operating revenues (unaudited and in thousands) 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
Deferred Costs (in thousands) Deferred costs were $2,525 and $6,994 at January 1, 2020 and 2019, respectively. The Company’s prepaid expenses and other current assets at December 31, 2020 and 2019 included deferred costs incurred to fulfill contracts with customers of $1,847 and $2,525, respectively. Deferred costs at December 31, 2020 compared to January 1, 2020 and at December 31, 2019 compared to January 1, 2019 decreased primarily as a result of the completion of several projects for clients with significant deferred fulfillment costs at the beginning of each of the years. The amount of total deferred costs amortized for the years ended December 31, 2020 and 2019 was $16,130 and $38,468, respectively. There were no material impairment losses incurred during these periods. Deferred Revenue (in thousands) Deferred revenue was $3,481 and $10,501 at January 1, 2020 and 2019, respectively. The Company’s deferred revenue at December 31, 2020 and 2019 was $1,779 and $3,481, respectively. Deferred revenue at December 31, 2020 compared to January 1, 2020 and at December 31, 2019 compared to January 1, 2019 decreased primarily as a result of completing multiple large projects for clients throughout each of the years. Revenue recognized for the year ended December 31, 2020 that was included in the contract liability balance at the beginning of 2020 was $3,476. Revenue recognized for the year ended December 31, 2019 that was included in the contract liability balance at the beginning of 2019 was $10,501. Deferred revenue not recognized during 2020 relates to a project that has not yet started.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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