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Segment Information and Significant Customers (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Customer
Jun. 30, 2014
Customer
Jun. 30, 2015
Segment
Customer
Jun. 30, 2014
Customer
Dec. 31, 2014
Customer
Entity Wide Revenue Major Customer [Line Items]          
Number of reportable segments | Segment     1    
Accounts Receivable [Member]          
Entity Wide Revenue Major Customer [Line Items]          
Percent from major customers 55.00% 94.00% 37.00%   41.00%
Number of major customers 2 3 2   2
Revenue [Member]          
Entity Wide Revenue Major Customer [Line Items]          
Percent from major customers     59.00% 57.00%  
Number of major customers     3 3