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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Revenue [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 1 0  
Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 1   1
IQE Group Customer [Member] | Revenue [Member]      
Revenue, Major Customer [Line Items]      
Percentage share generated by major customers 12.00%    
Major Customer One [Member] | Maximum [Member]      
Revenue, Major Customer [Line Items]      
Percentage share generated by major customers   10.00%  
Major Customer One [Member] | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Percentage share generated by major customers 19.00%   22.00%
Top Five Major Customers [Member] | Revenue [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 5 5  
Percentage share generated by major customers 41.00% 35.00%