Schedule II - Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 28	$ 9	$ 134
Charged to Costs and Expenses	(6)	16	8
Deductions/ Write-offs (Recoveries)	7	(3)	133
Balance at End of Period	$ 15	$ 28	$ 9