Concentrations of Credit Risk - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Concentration Risk [Line Items]
Percentage of revenue to one customers	67.00%	80.00%
Amount of accounts receivable from one customer	$ 0	$ 100,496

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

No definition available.

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration