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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 01, 2016
Feb. 27, 2012
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Concentration Risk [Line Items]                  
Increase (decrease) in accounts payable             $ (3,945) $ (1,964)  
Increase (decrease) in net inventory             6,444 2,569  
Net sales     $ 8,261     $ 18,335 $ 23,812 47,154  
Securities excluded from net loss per share calculation (in shares)     74       150    
Warranty service periods 10 years                
Interest expense     $ 0     22 $ 0 71  
Communal                  
Concentration Risk [Line Items]                  
Recorded expenses under agreement           $ 56   $ 169  
Chief Executive Officer                  
Concentration Risk [Line Items]                  
Ownership interest   50.00%              
Minimum                  
Concentration Risk [Line Items]                  
Warranty service periods         1 year        
Maximum                  
Concentration Risk [Line Items]                  
Warranty service periods         5 years        
Immediate family member of management                  
Concentration Risk [Line Items]                  
Ownership interest   50.00%              
Geographic concentration risk | United States                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)             99.00%    
Revenue | Customer concentration risk                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)             11.00%    
Revenue | Customer concentration risk | LED Lighting Solutions Global, LLC                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)     12.00%     74.00%   79.00%  
Revenue | Geographic concentration risk | Countries outside of the United States                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)     1.00%     1.00% 2.00% 1.00%  
Atlantic Diving Supply, Inc. | Revenue | Customer concentration risk                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)     40.00%       32.00%    
Atlantic Diving Supply, Inc. | Accounts receivable | Customer concentration risk                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)             65.00%   62.00%
U.S. Navy                  
Concentration Risk [Line Items]                  
Net sales             $ 2,100   $ 3,200
U.S. Navy | Revenue | Customer concentration risk                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)     46.00%     82.00%   85.00%  
U.S. Navy | Revenue | Product concentration risk                  
Concentration Risk [Line Items]                  
Concentration risk (less than for one percent)             40.00%    
Finished products                  
Concentration Risk [Line Items]                  
Increase (decrease) in revenue       $ (814)          
Increase (decrease) in accounts payable       814          
Increase (decrease) in net inventory       221          
Increase (decrease) in cost of sales       (221)          
Increase (decrease) in net income       $ (593)