Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Federal corporate income tax rate	21.00%	21.00%
Tax credit carryforward	$ 900,000	$ 900,000
Foreign subsidiaries undistributed earnings	13,500,000
Valuation allowance	65,228,000	51,895,000	$ 36,595,000
Unrecognized tax benefits	$ 1,000,000	0
Minimum [Member]
Operating Loss Carryforwards [Line Items]
Limitation range for income tax examination year	1 year
Maximum [Member]
Operating Loss Carryforwards [Line Items]
Limitation range for income tax examination year	4 years
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 32,100,000	31,000,000
Federal [Member] | Expire Till 2024 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,800
Federal [Member] | Expire Till 2035 [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	16,500
Federal [Member] | No Expiration [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	7,800
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	6,700,000	6,500,000
Changes in valuation allowance	3,800,000
Changes in uncertain tax positions	400,000
Foreign [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	3,100,000	$ 2,900,000
Federal And Foreign Tax [Member]
Operating Loss Carryforwards [Line Items]
Changes in valuation allowance	9,600,000
Changes in uncertain tax positions	$ 600,000