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Organization and Summary of Significant Accounting Policies - Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Short-term unbilled receivable - included in accounts receivable and unbilled $ 4,859 $ 4,590
Long-term unbilled receivable - included in other long-term assets 10,877 9,475
Total contract assets 15,736 14,065
Short-term deferred revenue 95,709 78,774
Long-term deferred revenue 8,806 10,623
Total contract liabilities $ 104,515 $ 89,397