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Summary of Significant Accounting Policies - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2019
USD ($)
customer
group
event
segment
shares
Sep. 30, 2018
USD ($)
customer
segment
shares
Oct. 01, 2019
USD ($)
Accounting Policies [Line Items]        
Number of operating segments | segment   1 1  
Allowance for doubtful accounts   $ 592 $ 520  
Accounts receivable, written off   33 186  
Bad debt expense   $ 39 $ 415  
Percentage of inventory estimated using LIFO method   27.00% 54.00%  
Reserve for obsolete and excess inventory   $ 3,335 $ 3,979  
Depreciation expense   $ 5,877 6,754  
Number of asset impairment triggering events | event   3    
Number of long-lived asset groups under impairment review | group   2    
Assets held for sale   $ 0 35  
Gain on disposal and impairment of assets $ 282 282 905  
Proceeds from sale of building, machinery and equipment $ 317      
Other receivables   $ 3,500 $ 0  
Restricted shares included in calculation of net loss per share (in shares) | shares   196,000 144,000  
Performance obligation, description of timing   one year or less    
Research and development expense   $ 0 $ 0  
Restricted Stock        
Accounting Policies [Line Items]        
Restricted shares included in calculation of net loss per share (in shares) | shares   0 0  
Subsidiaries        
Accounting Policies [Line Items]        
Rental income   $ 78 $ 413  
Minimum        
Accounting Policies [Line Items]        
Intangible assets amortized over useful lives (in years)   1 year    
Minimum | Subsequent event | Accounting Standards Update 2016-02        
Accounting Policies [Line Items]        
Right-of-use assets       $ 16,106
Operating lease liability       16,106
Maximum        
Accounting Policies [Line Items]        
Intangible assets amortized over useful lives (in years)   10 years    
Maximum | Subsequent event | Accounting Standards Update 2016-02        
Accounting Policies [Line Items]        
Right-of-use assets       20,218
Operating lease liability       $ 20,218
Building and Building Improvements | Minimum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   5 years    
Building and Building Improvements | Maximum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   40 years    
Machinery and Equipment | Minimum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   3 years    
Machinery and Equipment | Maximum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   20 years    
Computer Software | Minimum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   3 years    
Computer Software | Maximum        
Accounting Policies [Line Items]        
Property, plant and equipment, useful life (in years)   7 years    
Customer Concentration Risk | Sales Revenue, Net        
Accounting Policies [Line Items]        
Percentage of concentration risk   44.00% 31.00%  
Number of major customers | customer   3 2  
Customer Concentration Risk | Sales Revenue, Net | Total Customers And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   50.00% 38.00%  
Number of major customers | customer   4 3  
Customer Concentration Risk | Sales Revenue, Net | Major Customer One And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   14.00% 14.00%  
Customer Concentration Risk | Sales Revenue, Net | Major Customer Two And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   13.00% 12.00%  
Customer Concentration Risk | Sales Revenue, Net | Major Customer Three And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   12.00% 12.00%  
Customer Concentration Risk | Sales Revenue, Net | Major Customer Four And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   11.00%    
Customer Concentration Risk | Accounts Receivable        
Accounting Policies [Line Items]        
Number of major customers | customer   2 3  
Customer Concentration Risk | Accounts Receivable | Total Customers And Their Subcontractors        
Accounting Policies [Line Items]        
Number of major customers | customer   3 5  
Customer Concentration Risk | Accounts Receivable | Major Customer One And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   15.00% 16.00%  
Customer Concentration Risk | Accounts Receivable | Major Customer Two And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   14.00% 14.00%  
Customer Concentration Risk | Accounts Receivable | Major Customer Three And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk   12.00% 12.00%  
Customer Concentration Risk | Accounts Receivable | Major Customer Four And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk     11.00%  
Customer Concentration Risk | Accounts Receivable | Major Customer Five And Their Subcontractors        
Accounting Policies [Line Items]        
Percentage of concentration risk     11.00%  
Customer Concentration Risk | Accounts Receivable | Customer One        
Accounting Policies [Line Items]        
Percentage of concentration risk   10.00% 10.00%  
Customer Concentration Risk | Accounts Receivable | Customer Two        
Accounting Policies [Line Items]        
Percentage of concentration risk   10.00% 10.00%  
Customer Concentration Risk | Accounts Receivable | Customer Three        
Accounting Policies [Line Items]        
Percentage of concentration risk     10.00%  
Effect of Accounting Changes | Accounting Standards Update 2014-09        
Accounting Policies [Line Items]        
Reserve for obsolete and excess inventory   $ 366    
LIFO reserve   $ 508