Net Operating Loss Carryforwards (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
U.S. Federal and state income tax
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 25,364
U.S. Federal and state income tax | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2018
U.S. Federal and state income tax | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2035
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 9,879
Foreign | Minimum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2018
Foreign | Maximum
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, year of expiration	2037
Indefinite
Operating Loss Carryforwards [Line Items]
Operating loss carryforward, amount	$ 47,707
Operating loss carryforward, year of expiration	Indefinite