Provision for Income Taxes Reconciled to Amount Computed by Applying Statutory Federal Tax Rate to Loss before Income Taxes from Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax (benefit) provision at statutory federal tax rate of 21% and 34% for 2018 and 2017, respectively	$ 955	$ 2,845
State taxes, net of federal benefit	(21)	(22)
Foreign taxes provisions provided for at rates other than U.S statutory rate	222	(687)
Federal rate adjustment		(15,780)
Change in valuation allowance	(1,141)	13,931
Permanent differences	108	200
Acquisition costs	(115)
Other	(163)	(273)
Total (provision) benefit for income taxes	$ (155)	$ 214