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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income tax benefit at federal statutory rate	$ (33,366,000)	$ (32,352,000)	$ (38,183,000)
State tax	(5,591,000)	(4,482,000)	(334,000)
Business credits	(3,065,000)	(1,960,000)	(1,950,000)
Deferred compensation charges	(1,165,000)	3,823,000	3,016,000
Change in valuation allowance	43,134,000	(109,165,000)	36,751,000
Rate change		86,943,000
Net operating loss and tax credit limitation		56,962,000
Other	53,000	231,000	700,000
Total income tax expense	$ 0	$ 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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