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Organization and Summary of Significant Accounting Policies - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Accounting Policies [Abstract] |  |
Short-term unbilled receivables - included in accounts receivable and unbilled receivables | $ 9,475 | $ 4,590
Long-term unbilled receivables - included in other long-term assets | 15,573 | 9,475
Total contract assets | 25,048 | 14,065
Short-term deferred revenues | 87,777 | 78,774
Long-term deferred revenues | 10,634 | 10,623
Total contract liabilities | $ 98,411 | $ 89,397

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