Reconciliation of Difference Between Company's Income Tax Provision (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]
Income tax expense (benefit) at statutory federal tax rate of 34%	$ (4,711)	$ (13,247)
State taxes, net of federal benefit	17	11
Foreign taxes benefits provided for at rates other than U.S statutory rate	424	(1,349)
Change in valuation allowance	4,064	11,728
Goodwill impairment		2,646
Permanent differences		731
Other	338	(298)
Total provision for income taxes	$ 132	$ 222