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Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues | $ 204,267,000 | $ 186,748,000 | $ 575,559,000 | $ 516,343,000 |
Deferred revenues | 98,411,000 |  | 98,411,000 |  | $ 89,397,000
Short-term deferred revenues | 87,777,000 |  | 87,777,000 |  | $ 78,774,000
Revenues from sales-type leases | 11,400,000 | 5,900,000 | 28,800,000 | 19,300,000 |
Fees to GPOs | 2,200,000 | 2,100,000 | 6,200,000 | 5,400,000 |
Deferred revenues recognized | 10,900,000 |  | 78,900,000 |  |
Capitalized commissions | 5,300,000 | 4,600,000 | 16,200,000 | 13,300,000 |
Impairment loss | 0 |  | 0 |  |
Product revenues |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues | 149,709,000 | 136,838,000 | $ 415,004,000 | 365,834,000 |
Difference between Revenue Guidance in Effect before and after Topic 606 | Product revenues |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Total revenues | $ 600,000 | $ 200,000 |  | $ 500,000 |
Lease Receivable | Customer Concentration Risk |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Concentration risk percentage |  |  | 44.00% |  |

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