Balance Sheet Disclosures - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Depreciation expense	$ 5.9	$ 0.5
Amortization expense	$ 0.9	0.4
Weighted Average [Member]
Finite-lived intangible asset useful life	8 years 9 months 18 days
Weighted Average [Member] \| Customer Relationships [Member]
Finite-lived intangible asset useful life	8 years 9 months 18 days
Weighted Average [Member] \| Trade Names [Member]
Finite-lived intangible asset useful life	9 years 6 months
Weighted Average [Member] \| Noncompete Agreements [Member]
Finite-lived intangible asset useful life	4 years 2 months 12 days
CNG [Member]
Impairment charges of long-lived assets	$ 3.6	$ 0.2

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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