Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Inventories (Detail)

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Summary of Significant Accounting Policies - Inventories (Detail) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Accounting Policies [Abstract]    
Finished goods $ 2,405,237 $ 2,143,176
Work in process 198,030 145,156
Raw materials 972,512 862,777
Inventory $ 3,575,779 $ 3,151,109