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Organization and Summary of Significant Accounting Policies - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Short-term unbilled receivables - included in accounts receivable and unbilled receivables	$ 6,031	$ 4,590
Long-term unbilled receivables - included in other long-term assets	12,150	9,475
Total contract assets	18,181	14,065
Short-term deferred revenues	85,776	78,774
Long-term deferred revenues	8,957	10,623
Total contract liabilities	$ 94,733	$ 89,397

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