Income Taxes - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Oct. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Alternative minimum tax credit carryforwards			$ 500,000
Tax credit carryforwards, Expire year			2027
Unrecognized tax benefits			$ 428,000	$ 428,000	$ 592,000
Valuation allowance			52,948,000	76,648,000
Increase (decrease) in valuation allowance of deferred tax assets			(23,700,000)	1,700,000	$ (800,000)
Interest and penalties			0	0
Cumulative interest and penalties			$ 0	$ 0
Unrecognized tax benefits impacted due to expiration of statute of limitations	$ 164,000,000
Corporate tax rate			35.00%	35.00%	35.00%
Reduced net deferred tax assets due to change in coporate tax rate			$ 26,900,000
Income (loss) before provision for income taxes for foreign subsidiaries			(75,000)	$ (427,000)	$ 117,000
Unremitted earnings			300,000
Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items]
Corporate tax rate		21.00%
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			$ 151,000,000
Net operating loss carryforwards, expiry terms			Federal NOL carryforwards will expire from 2024 through 2037
Tax credit carryforwards			$ 2,500,000
Federal income tax returns subject to examination description			Federal income tax returns of the Company are subject to IRS examination for the 2013 – 2016 tax years
State [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards			$ 147,800,000
Net operating loss carryforwards, expiry terms			State NOL carryforwards will expire 2017 through 2037
Tax credit carryforwards			$ 700,000
Federal income tax returns subject to examination description			State income tax returns are subject to examination for a period of three to four years after filing