Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards, Expire year	2028
Unrecognized tax benefits	$ 412,000	$ 428,000	$ 428,000
Cumulative loss period	3 years
Valuation allowance	$ 57,346,000	49,405,000
Increase (decrease) in valuation allowance of deferred tax assets	(7,900,000)	(1,000,000.0)
Interest and penalties	0	0
Cumulative interest and penalties	0	0
Outstanding tax audit	0
Income before provision for income taxes for foreign subsidiaries	473,000	112,000
Income related to GILTI	$ 300,000
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		180,300,000
Net operating loss carryforwards, expiry terms	Federal NOL carryforwards will expire from 2024 through 2037
Tax credit carryforwards	$ 2,500,000
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards		$ 148,600,000
Net operating loss carryforwards, expiry terms	State NOL carryforwards will expire 2018 through 2041
Tax credit carryforwards	$ 700,000
Federal income tax returns subject to examination description	The Company is no longer subject to examination for U.S. federal income tax returns for years before December 31, 2018 and for state income tax returns, the Company is no longer subject to examination for years before December 31, 2017