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Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 01, 2016
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Concentration Risk [Line Items]            
Securities excluded from net loss per share calculation (in shares)   64 146 99 183  
Warranty service periods 10 years          
Minimum            
Concentration Risk [Line Items]            
Warranty service periods       1 year    
Maximum            
Concentration Risk [Line Items]            
Warranty service periods       5 years    
Geographic concentration risk | United States            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)       98.00%    
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% 1.00% 3.00%  
Global Healthcare Systems, Northeast Ohio | Revenue | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)   11.00% 11.00% 15.00% 11.00%  
Global Healthcare Systems, Northeast Ohio | Accounts receivable | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)           10.00%
Customer One | Accounts receivable | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)       17.00%    
Customer Two | Accounts receivable | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)       12.00%    
Atlantic Diving Supply, Inc. | Revenue | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)   11.00% 36.00% 12.00% 27.00%  
Atlantic Diving Supply, Inc. | Accounts receivable | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)           63.00%
U.S. Navy | Revenue | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)   12.00%   17.00% 38.00%  
DFAS Columbus | Revenue | Customer concentration risk            
Concentration Risk [Line Items]            
Concentration risk (less than for one percent)         11.00%  
Finished Products            
Concentration Risk [Line Items]            
Increase (decrease) in revenue     $ (814)      
Increase (decrease) in cost of sales     (221)      
Increase (decrease) in net income     $ (593)