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Supplemental Balance Sheet Disclosures - Unbilled Receivables (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jan. 31, 2016
Sep. 30, 2015
Unbilled receivables            
Unbilled receivables, net $ 1,611,357   $ 1,611,357     $ 3,920,209
Change in operating income resulting from revised estimates 232,344 $ (264,860) 1,896,726 $ (736,512)    
Inventories valuation            
Raw materials 3,151,301   3,151,301     3,346,778
Work-in-process 474,767   474,767     745,311
Finished goods 382,046   382,046     505,227
Inventory, Net, Total 4,008,114   4,008,114     4,597,316
Prepaid expenses and other current assets            
Prepaid insurance 434,017   434,017     290,543
Income tax refund receivable 380,806   380,806     386,869
Other 321,445   321,445     544,305
Total 1,136,268   1,136,268     1,221,717
Delta            
Unbilled receivables            
Provision for loss on unbilled receivables 3,600,000   3,600,000     3,600,000
Unbilled receivables, net           3,600,000
Inventories valuation            
Inventory, Net, Total           200,000
A Certain Customer            
Unbilled receivables            
Provision for loss on unbilled receivables           $ 1,300,000
Unbilled receivables that have been cancelled         $ 1,300,000  
Contracts accounted for under percentage of completion            
Unbilled receivables            
Change in operating income resulting from revised estimates $ (120,000) $ (125,000) $ 232,000 $ 595,000