Intangible Assets - Narrative (Detail) - Micromidas, Inc. - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets weighted average useful life	5 years 2 months 12 days
Amortization expense	$ 0.0	$ 0.0

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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