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Supplemental Balance Sheet Disclosures (Details) (USD $)
Dec. 31, 2012
Sep. 30, 2012
Inventory valuation    
Raw materials $ 2,610,038 $ 2,752,833
Work-in-process 580,994 555,495
Finished goods 276,662 493,219
Inventory 3,467,694 3,801,547
Prepaid expenses and other current assets    
Revenue recognized not yet invoiced 3,007,771 1,595,436
Prepaid insurance 233,075 176,340
Other 428,882 259,868
Total $ 3,669,728 $ 2,031,644