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Recent Accounting Pronouncements - Condensed Consolidated Statements of Operations and Balance Sheets (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Cumulative effect of initial application         $ 158  
Income Statement [Abstract]            
Total sales $ 16,350   $ 35,330      
Total cost of sales 12,604 $ 12,621 27,235 $ 24,888    
Gross profit 3,746 3,983 8,095 8,346    
Operating loss (771) (864) (756) (699)    
Income tax expense (benefit) (142) (200) (140) 993    
Net loss (619) (742) (569) (1,737)    
Net loss attributable to common stockholders $ (619) $ (594) $ (569) $ (1,794)    
Basic earnings per share (usd per share) $ (0.15) $ (0.16) $ (0.15) $ (0.47)    
Diluted earnings per share (usd per share) $ (0.15) $ (0.16) $ (0.15) $ (0.47)    
Assets:            
Accounts receivable $ 16,456   $ 16,456     $ 11,980
Unbilled accounts receivable 0   0     1,166
Inventories 5,857   5,857     7,558
Other current assets 3,023   3,023     1,878
Deferred tax asset 1,837   1,837     1,895
Liabilities:            
Deferred revenue 3,111   3,111      
Shareholders' Equity:            
Retained earnings 28,291   28,291     $ 29,926
Balances without adoption of ASC 606            
Income Statement [Abstract]            
Total sales 16,357   35,231      
Total cost of sales 12,603   27,103      
Gross profit 3,754   8,128      
Operating loss (763)   (723)      
Income tax expense (benefit) (136)   (133)      
Net loss (617)   (543)      
Net loss attributable to common stockholders $ (617)   $ (543)      
Basic earnings per share (usd per share) $ 0   $ 0      
Diluted earnings per share (usd per share) $ 0   $ 0      
Assets:            
Accounts receivable $ 16,274   $ 16,274      
Unbilled accounts receivable 782   782      
Inventories 6,178   6,178      
Other current assets 2,235   2,235      
Deferred tax asset 1,903   1,903      
Liabilities:            
Deferred revenue 3,442   3,442      
Shareholders' Equity:            
Retained earnings 28,159   28,159      
Effect of change Higher/(Lower) | Accounting Standards Update 2014-09            
Income Statement [Abstract]            
Total sales (7)   99      
Total cost of sales 1   132      
Gross profit (8)   (33)      
Operating loss (8)   (33)      
Income tax expense (benefit) (6)   (7)      
Net loss (2)   (26)      
Net loss attributable to common stockholders $ (2)   $ (26)      
Basic earnings per share (usd per share) $ 0   $ 0      
Diluted earnings per share (usd per share) $ 0   $ 0      
Assets:            
Accounts receivable $ 182   $ 182      
Unbilled accounts receivable (782)   (782)      
Inventories (321)   (321)      
Other current assets 788   788      
Deferred tax asset (66)   (66)      
Liabilities:            
Deferred revenue (331)   (331)      
Shareholders' Equity:            
Retained earnings $ 132   $ 132      
Retained Earnings | Accounting Standards Update 2014-09            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Cumulative effect of initial application         $ 158