Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowances	$ (56,881,000)	$ (8,537,000)	$ 4,974,000
Statutory federal income tax rate	21.00%	21.00%	35.00%
Tax legislation impact	$ 0	$ 0	$ (21,430,000)
Federal net operating loss carryforwards for income tax purposes	391,900,000
State net operating loss carryforwards for income tax purposes	26,900,000
Unrecognized tax benefits impacting effective tax rate	6,300,000	4,700,000
Deferred tax asset subject to valuation allowance	13,200,000	17,900,000
Significant adjustments	0
Uncertain tax position, interest and penalties	(400,000)	400,000	$ 200,000
Interest and penalties accrued	$ 1,400,000	$ 1,500,000