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Provision for Income Taxes on Earnings Subject to Income Taxes Differs from Statutory Federal Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal income taxes at 21% for 2018 and 35% for 2017 and 2016	$ 4,587	$ (49,889)	$ (49,383)
State income tax, net of federal benefit	361	(4,013)	2
Tax effect on non-deductible expenses	446	433	(321)
Share-based compensation expense	(9,778)	(19,589)	(5,077)
Officer compensation	915	2,163	0
Change in tax rate	(198)	154,415	0
Expired tax attributes	13,874	2,998	6,708
Research credits	(13,526)	(5,596)	(5,554)
Change in valuation allowance	4,306	(79,966)	53,414
Other	(257)	(956)	211
Income Tax Expense (Benefit), Total	$ 730	$ 0	$ 0

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