Summary of Revised Consolidated Statement of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	$ 13,094		$ 17,150			$ 59,676
Operating Income	25,273	$ 2,165	(4,850)	$ (2,687)	$ 63,663	65,723
Net Loss	$ 6,939	$ (17,064)	$ (21,001)	$ (38,066)	$ 8,663	$ (4,854)
Net Loss per share - basic and diluted		$ (1.58)		$ (3.47)		$ (0.75)
Earnings (loss) per share - basic	$ 0.30		$ (1.89)		$ 0.41
Earnings (loss) per share - diluted	$ 0.26		$ (1.89)		$ 0.32
As Reported
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses						$ 59,398
Gain on Sale of Investment		$ (1,600)		$ (1,600)	$ (1,600)	(1,600)
Operating Income		3,765		(1,087)	65,263	67,601
Net Loss		$ (15,464)		$ (36,466)	$ 10,263	$ (2,976)
Net Loss per share - basic and diluted		$ (1.44)		$ (3.33)		$ (0.60)
Earnings (loss) per share - basic					$ 0.54
Earnings (loss) per share - diluted					$ 0.37
Adjustments
Error Corrections And Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses						$ 278
Gain on Sale of Investment		$ 1,600		$ 1,600	$ 1,600	1,600
Operating Income		(1,600)		(1,600)	(1,600)	(1,878)
Net Loss		$ (1,600)		$ (1,600)	$ (1,600)	$ (1,878)
Net Loss per share - basic and diluted		$ (0.13)		$ (0.14)		$ (0.15)
Earnings (loss) per share - basic					$ (0.13)
Earnings (loss) per share - diluted					$ (0.05)