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SUPPLEMENTAL CONSOLIDATED FINANCIAL STATEMENT INFORMATION - Disaggregated Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Number of business segments | segment			1
Operating Revenues	$ 1,914	$ 8,738	$ 13,855	$ 77,216
United States
Operating Revenues	$ 1,914	$ 8,738	10,891	65,408
Canada
Operating Revenues			$ 2,964	$ 11,808

X

- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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