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Nature of Business - Schedule of Impact of Adoption of ASU 2018-15 on Consolidated Statement of Income (Loss) and Cash Flows (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policy [Line Items]
Net income (loss)	$ 6,114	$ 5,481	$ 752	$ (9,969)	$ (11,624)	$ (46,123)	$ 3,995	$ 770	$ 2,378	$ (52,982)	$ (19,342)
Net cash provided by (used in) operating activities									$ (16,518)	(2,472)	$ 55,454
ASU 2018-15 [Member]
Summary Of Significant Accounting Policy [Line Items]
Net income (loss)										(52,982)
Net cash provided by (used in) operating activities										(2,472)
Pre-Adoption [Member]
Summary Of Significant Accounting Policy [Line Items]
Net income (loss)										(52,982)
Net cash provided by (used in) operating activities										$ (2,472)

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