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The Company and Summary of Significant Accounting Policies - Concentration Risk (Details) - customer
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 0 1 0
Percentage share generated by major customers (in hundredths) 10.00%   10.00%
Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 1 1  
Major Customer One [Member] | Accounts Receivable [Member]      
Revenue, Major Customer [Line Items]      
Percentage share generated by major customers (in hundredths) 13.00% 22.00%  
IQE Group Customer [Member] | Revenue [Member]      
Revenue, Major Customer [Line Items]      
Percentage share generated by major customers (in hundredths)   12.00%  
Top Five Major Customers [Member] | Revenue [Member]      
Revenue, Major Customer [Line Items]      
Number of customers representing significant share 5 5 5
Percentage share generated by major customers (in hundredths) 35.00% 40.00% 34.00%