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CONCENTRATION OF RISK, Revenues and Accounts Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
[1]
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
[2]
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Concentration Risk [Line Items]                      
Revenue $ 62,312 [1] $ 39,419 $ 58,092 $ 31,223 $ 56,173 [2] $ 32,892 $ 64,127 $ 37,839 $ 191,046 $ 191,031 $ 146,639
Accounts receivable 24,729       22,075       24,729 22,075  
Total Revenue [Member] | Government Contracts Concentration Risk [Member]                      
Concentration Risk [Line Items]                      
Revenue                 $ 200 $ 100 $ 1,100
Concentration risk, percentage (in hundredths)                 1.00% 1.00% 1.00%
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer A [Member]                      
Concentration Risk [Line Items]                      
Concentration risk, percentage (in hundredths)                 62.00% 54.00% 60.00%
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer B [Member]                      
Concentration Risk [Line Items]                      
Concentration risk, percentage (in hundredths)                 25.00% 19.00% 9.00%
Total Revenue [Member] | Customer Concentration Risk [Member] | Major Customer C [Member]                      
Concentration Risk [Line Items]                      
Concentration risk, percentage (in hundredths)                 5.00% 18.00% 22.00%
Total Revenue [Member] | Geographic Concentration Risk [Member]                      
Concentration Risk [Line Items]                      
Concentration risk, percentage (in hundredths)                 99.00% 99.00% 99.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer A [Member]                      
Concentration Risk [Line Items]                      
Accounts receivable 13,355       8,550       $ 13,355 $ 8,550 $ 7,337
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer B [Member]                      
Concentration Risk [Line Items]                      
Accounts receivable 8,477       7,598       8,477 7,598 4,743
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Major Customer C [Member]                      
Concentration Risk [Line Items]                      
Accounts receivable $ 198       $ 953       $ 198 $ 953 $ 2,905
[1] (1) The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.
[2] (1) The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.