Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Valuation allowance	$ 62,492,000	$ 60,824,000
Corporate federal tax rate	21.00%	21.00%
GILTI income	$ 500,000	$ 0
Operating loss carryforwards, expiration end year	2039
Liabilities for unrecognized tax benefits	$ 2,700,000	2,800,000
Amount of unrecognized tax benefits, which, if recognized, would affect the tax rate	100,000	100,000
Penalties accrued related to unrecognized tax benefits	(1,000)	1,000
Interest accrued related to unrecognized tax benefits	2,000	1,000
Recognized total liability for penalties	12,000	13,000
Recognized total liability for interest	35,000	$ 33,000
Federal
Income Taxes [Line Items]
Operating loss carryforwards	117,300,000
State
Income Taxes [Line Items]
Operating loss carryforwards	42,100,000
Foreign
Income Taxes [Line Items]
Operating loss carryforwards	$ 72,200,000
Maximum
Income Taxes [Line Items]
Corporate federal tax rate			35.00%