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Difference between Consolidated Income Tax Benefit and Amount Computed by Federal Statutory Income Tax Rate (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ 16,397,000	$ (15,756,000)	$ (32,046,000)
State tax	3,576,000	(3,194,000)	(3,153,000)
Business credits	(982,000)	(773,000)	(1,757,000)
Uncertain tax positions	424,000	193,000	5,426,000
Deferred compensation charges	131,000	809,000	4,600,000
Change in valuation allowance	(86,847,000)	19,009,000	22,715,000
Section 162(m) limitation	1,241,000	473,000	2,439,000
Mark-to-market of warrants	10,364,000	(866,000)	1,575,000
Net operating loss and tax credit limitation	56,459,000	0	0
Other	45,000	105,000	201,000
Total income tax expense	$ 808,000	$ 0	$ 0

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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