Significant Customers and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 Customer	Dec. 31, 2012	Sep. 30, 2013 Customers One [Member]	Sep. 30, 2012 Customers One [Member]	Sep. 30, 2013 Customers One [Member]	Sep. 30, 2012 Customers One [Member]	Sep. 30, 2013 Customers Two [Member]	Sep. 30, 2012 Customers Two [Member]	Sep. 30, 2013 Customers Two [Member]	Sep. 30, 2012 Customers Two [Member]	Sep. 30, 2013 Customers Three [Member]	Sep. 30, 2012 Customers Three [Member]	Sep. 30, 2013 Customers Three [Member]	Sep. 30, 2012 Customers Three [Member]
Revenue, Major Customer [Line Items]
Percentage of sales			74.00%	62.00%	71.00%	68.00%	5.00%	5.00%	7.00%	5.00%	8.00%	7.00%	5.00%	4.00%
Accounts receivable	$ 988,304	$ 1,031,405	$ 624,000	$ 602,000	$ 624,000	$ 602,000	$ 111,000	$ 97,000	$ 111,000	$ 97,000	$ 178,000	$ 88,000	$ 178,000	$ 88,000
Number of major customers	3