Schedule II - Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for accounts receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance at beginning of period	$ 602	$ 617	$ 482
Valuation Allowances and Reserves, Additions charged to costs and expenses	31	347	730
Valuation Allowances and Reserves, Deductions	(432)	(362)	(595)
Valuation Allowances and Reserves, Balance at end of period	201	602	617
Allowance for excess and obsolete inventory [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance at beginning of period	151	301	352
Valuation Allowances and Reserves, Additions charged to costs and expenses	48	124	76
Valuation Allowances and Reserves, Deductions	(41)	(274)	(127)
Valuation Allowances and Reserves, Balance at end of period	$ 158	$ 151	$ 301