Income Taxes - Additional Information (Detail) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 22, 2017	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate				35.00%
Tax cuts and jobs act of 2017, Incomplete accounting, income tax provision		$ 1,565,000
Tax cuts and jobs act of 2017, Incomplete accounting, repatriation transition tax percentage	100.00%
Accumulated other comprehensive loss reclassified to retained earnings				$ 0
Operating loss carryforwards, limitations on use				operating losses can be carried forward indefinitely, but are limited to 80 percent of taxable income in any given year
Deferred tax liability recorded		0		$ 0	$ 0
Unrecognized tax benefits		31,000		$ 31,000
Reversal period of unrecognized tax benefits due to lapse in statue of limitations				Within the next 12 months
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		3,208,000		$ 3,208,000
Operating loss carry forwards expiration period				2035
Income tax refund received				$ 6,540,000
State [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		34,495,000		$ 34,495,000
Operating loss carry forwards expiration period				2018
Foreign Tax Authority [Member]
Income Tax Contingency [Line Items]
Net operating loss carryforwards		93,364,000		$ 93,364,000
Operating loss carry forwards expiration period				2018
Capital loss carryforwards		814,000		$ 814,000
Capital loss carry forwards expiration period				Capital loss carryforwards of $814 which do not expire
Reverse in the Next Twelve Months [Member]
Income Tax Contingency [Line Items]
Unrecognized tax benefits		$ 117,000		$ 117,000
Retained Earnings [Member]
Income Tax Contingency [Line Items]
Accumulated other comprehensive loss reclassified to retained earnings				$ 6,088,000
Scenario Forecast [Member]
Income Tax Contingency [Line Items]
U.S. corporate statutory income tax rate			21.00%