Significant Customers and Contingencies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Number of major customers	3
Accounts receivable	$ 52	$ 1,031
Customers One [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	(308)	420
Customers One [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue from top customers	72.00%	67.00%
Customers Two [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	46	46
Customers Two [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue from top customers	6.00%	4.00%
Customers Three [Member]
Revenue, Major Customer [Line Items]
Accounts receivable	$ 111	$ 173
Customers Three [Member] | Sales [Member]
Revenue, Major Customer [Line Items]
Revenue from top customers	5.00%	5.00%