Significant Customers and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013 Customer	Dec. 31, 2012	Jun. 30, 2013 Customers One [Member]	Jun. 30, 2012 Customers One [Member]	Jun. 30, 2013 Customers One [Member]	Jun. 30, 2012 Customers One [Member]	Jun. 30, 2013 Customers Two [Member]	Jun. 30, 2012 Customers Two [Member]	Jun. 30, 2013 Customers Two [Member]	Jun. 30, 2012 Customers Two [Member]	Jun. 30, 2013 Customers Three [Member]	Jun. 30, 2012 Customers Three [Member]	Jun. 30, 2013 Customers Three [Member]	Jun. 30, 2012 Customers Three [Member]
Revenue, Major Customer [Line Items]
Percentage of sales			62.00%	70.00%	71.00%	70.00%	11.00%	0.00%	5.00%	0.00%	9.00%	5.00%	8.00%	5.00%
Accounts receivable	$ 1,598,782	$ 1,031,405	$ 845,000	$ 945,000	$ 845,000	$ 945,000	$ 284,000	$ 0	$ 284,000	$ 0	$ 243,000	$ 150,000	$ 243,000	$ 150,000
Number of major customers	3