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Summary of Significant Accounting Policies - Schedule of Impact of Adoption of ASU 2018-15 on Condensed Consolidated Statement of Loss and Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Summary Of Significant Accounting Policy [Line Items]
Net loss	$ 5,481	$ 752	$ (9,969)	$ (46,123)	$ 3,995	$ 770	$ (3,736)	$ (41,358)
Net cash provided by operating activities							$ (5,317)	10,082
ASU 2018-15 [Member]
Summary Of Significant Accounting Policy [Line Items]
Net loss				(46,123)				(41,358)
Net cash provided by operating activities								10,082
Pre-Adoption [Member]
Summary Of Significant Accounting Policy [Line Items]
Net loss				$ (46,123)				(41,358)
Net cash provided by operating activities								$ 10,082

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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