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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
NGL Impact A [Member] | Research and Development Arrangement [Member]
Commitments and Contingencies [Line Items]
Payments to Navigo in connection with this program, which are recorded to research and development expenses	$ 0.2	$ 0.4

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- Definition

Commitments and Contingencies [Line Items]

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

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